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From: Hugo Nguyen <hugo@nunchuk.io>
Date: Mon, 5 Apr 2021 00:02:45 -0700
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Subject: Re: [bitcoin-dev] Proposal: Bitcoin Secure Multisig Setup
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Hi all,

Please find below the complete draft of the Bitcoin Secure Multisig Setup
(BSMS) BIP. The spec has gone through a number of important updates in the
last month or so. Thanks everyone who has participated in the review
process.

As a PR: https://github.com/bitcoin/bips/pull/1097

A few notes:
* PBKDF2-SHA512 was chosen instead of PBKDF2-SHA256 for the key derivation
function, due to widespread existing hardware support for PBKDF2-SHA512
* Only one descriptor is stored in the multisig configuration - this
simplifies wallet setup and recovery
(For the full review and relevant discussions, please check out
https://github.com/nunchuk-io/bips/pull/1).

Best,
Hugo

<pre>
  BIP: To be determined
  Layer: Applications
  Title: Bitcoin Secure Multisig Setup (BSMS)
  Author: Hugo Nguyen <hugo at nunchuk.io>, Peter Gray <peter at
coinkite.com>, Marko Bencun <marko at shiftcrypto.ch>, Aaron Chen
<aarondongchen at gmail.com>, Rodolfo Novak <rodolfo at coinkite.com>
  Comments-Summary: No comments yet.
  Comments-URI:
  Status: Proposed
  Type: Standards Track
  Created: 2020-11-10
  License: BSD-2-Clause
</pre>

=3D=3DIntroduction=3D=3D

=3D=3D=3DAbstract=3D=3D=3D

This document proposes a mechanism to set up multisig wallets securely.

=3D=3D=3DCopyright=3D=3D=3D

This BIP is licensed under the 2-clause BSD license.

=3D=3D=3DMotivation=3D=3D=3D

The Bitcoin multisig experience has been greatly streamlined under
[https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki
BIP-0174
(Partially Signed Bitcoin Transaction)]. However, what is still
missing is a standardized process for setting up multisig wallets
securely across different vendors.

There are a number of concerns when it comes to setting up a multisig walle=
t:

# Whether the multisig configuration, such as Signer membership,
script type, derivation paths and number of signatures required, is
correct and not tampered with.
# Whether the keys or the multisig configuration are leaked during the setu=
p.
# Whether the Signer persists the multisig configuration in their
respective storage, and under what format.
# Whether the Signer's storage is tamper-proof.
# Whether the Signer subsequently uses the multisig configuration to
generate and verify receive and change addresses.

An attacker who can modify the multisig configuration can steal or
hold funds for ransom by duping the user into sending funds to the
wrong address. An attacker who cannot modify the configuration but can
learn about the keys and/or the configuration can monitor transactions
in the wallet, resulting in loss of privacy.

This proposal seeks to address concerns #1, #2 and #3: to mitigate the
risk of tampering during the initial setup phase, and to define an
interoperable multisig configuration format.

Concerns #4 and #5 should be handled by Signers and are out of scope
of this proposal.

=3D=3DSpecification=3D=3D

=3D=3D=3DPrerequisites=3D=3D=3D
This proposal assumes the parties in the multisig support
[https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
BIP-0032], [https://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki
BIP-0322], [https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.=
md
the descriptor language] and [https://tools.ietf.org/html/rfc3686 AES
encryption].

=3D=3D=3DFile Extension=3D=3D=3D
All descriptor and key records should have a <tt>.bsms</tt> file
extension. Encrypted data should have a <tt>.dat</tt> extension.

=3D=3D=3DRoles=3D=3D=3D
=3D=3D=3D=3DCoordinator=3D=3D=3D=3D

The Coordinator initiates the multisig setup. The Coordinator
determines what type of multisig is used and the exact policy script.
If encryption is enabled, the Coordinator also distributes a shared
secret or shared secrets to the parties involved for secure
communication. The Coordinator gathers information from the Signers to
generate a descriptor record. The Coordinator distributes the
descriptor record back to the Signers.

=3D=3D=3D=3DSigner=3D=3D=3D=3D

The Signer is a participating member in the multisig. Its
responsibilities include providing its key record -- which contains an
Extended Public Key (XPUB) -- to the Coordinator, verifying that its
XPUB is included in the descriptor record and persisting the
descriptor record in its storage.

=3D=3D=3DSetup Process=3D=3D=3D

=3D=3D=3D=3DRound 1=3D=3D=3D=3D

=3D=3D=3D=3D=3DCoordinator=3D=3D=3D=3D=3D

* The Coordinator creates a new multisig wallet creation session. The
Coordinator constructs the multisig script and its policy parameters,
such as the required number of signatures and the total number of
Signers (<tt>M</tt> and <tt>N</tt>).
* The session should expire after some time period determined by the
Coordinator, e.g., 24 hours. The timeout allows the encryption key to
have lower entropy.
* If encryption is enabled, the Coordinator distributes a secret
<tt>TOKEN</tt> to each Signer over a secure channel. The Signer can
use the <tt>TOKEN</tt> to derive an <tt>ENCRYPTION_KEY</tt>. Refer to
the Encryption section below for details on the <tt>TOKEN</tt>, the
key derivation function and the encryption scheme. Depending on the
use case, the Coordinator can decide whether to share one common
<tt>TOKEN</tt> for all Signers, or to have one per Signer.
* If encryption is disabled, the <tt>TOKEN</tt> is set to <tt>0</tt>,
and all the encryption/decryption steps below can be skipped.

=3D=3D=3D=3D=3DSigner=3D=3D=3D=3D=3D

* The Signer initiates the multisig wallet creation session by setting
the <tt>TOKEN</tt>. The Signer derives an <tt>ENCRYPTION_KEY</tt> from
the <tt>TOKEN</tt>. The Signer can keep the session open until a
different value for the <tt>TOKEN</tt> is set.
* The Signer generates a key record by prompting the user for a
multisig derivation path and retrieves the XPUB at that derivation
path. Alternatively, the Signer can choose a path on behalf of the
user. If the Signer chooses the path, it should try to avoid reusing
XPUBs for different wallets.
* The first line in the record must be the specification version
(<tt>BSMS 1.0</tt> as of this writing). The second line must be the
hex-encoded <tt>TOKEN</tt>. The third line must be the <tt>KEY</tt>.
The <tt>KEY</tt> is an XPUB plus its key origin information, written
in the descriptor-defined format, i.e.: <tt>[{master key
fingerprint}/{derivation path}]{XPUB}</tt>. The fourth line is a text
description of the key, 80 characters maximum. The fifth line must be
a <tt>SIG</tt>, whereas <tt>SIG</tt> is the signature generated by
using the private key associated with the XPUB to sign the first four
lines. The signature should follow
[https://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki
BIP-0322], legacy format accepted.
* The Signer calculates the Message Authentication Code (<tt>MAC</tt>)
for the record. The first 16 bytes of the <tt>MAC</tt> serves as the
Initialization Vector (<tt>IV</tt>) for the encryption.
* The Signer encrypts the key record with the <tt>ENCRYPTION_KEY</tt>
and <tt>IV</tt>.
* The Signer encodes the <tt>MAC</tt> and the ciphertext into
hexadecimal format, then concatenates the results: <tt>(MAC ||
ciphertext)</tt>.

=3D=3D=3D=3DRound 2=3D=3D=3D=3D

=3D=3D=3D=3D=3DCoordinator=3D=3D=3D=3D=3D

* The Coordinator gathers key records from all participating Signers.
The Coordinator verifies that there are exactly <tt>N</tt> unique key
records before the wallet setup session expires.
* For each key record, the Coordinator extracts the <tt>MAC</tt> from
the data, sets <tt>IV</tt> to the first 16 bytes of the <tt>MAC</tt>,
then decrypts the ciphertext using the <tt>ENCRYPTION_KEY</tt> and
<tt>IV</tt>.
* The Coordinator verifies that the included <tt>MAC</tt> is valid
given the plaintext.
* The Coordinator verifies that the key records have compatible
specification versions.
* The Coordinator verifies that the included <tt>SIG</tt> is valid
given the <tt>KEY</tt>.
* If all key records look good, the Coordinator fills in all necessary
information to generate a descriptor record.
* The first line in the descriptor record must be the specification
version (<tt>BSMS 1.0</tt> as of this writing). The second line must
be a comma-separated list of accepted derivation paths that the
Signers can use to generate addresses from the included XPUBs. The
paths must start with <tt>/</tt> and use non-hardened derivation. For
example, <tt>/0/*</tt> and <tt>/1/*</tt> are some common paths. If
there are no restrictions, it must say <tt>No path restrictions</tt>.
The third line must be the descriptor string plus a <tt>CHECKSUM</tt>,
all in one line. The <tt>CHECKSUM</tt> has
[https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md#checksum=
s
BECH32 encoding].
* The Coordinator calculates the <tt>MAC</tt> for the record. The
first 16 bytes of the <tt>MAC</tt> serves as the <tt>IV</tt> for the
encryption..
* The Coordinator encrypts the descriptor record with the
<tt>ENCRYPTION_KEY</tt> and <tt>IV</tt>.
* The Coordinator encodes the <tt>MAC</tt> and the ciphertext into
hexadecimal format, then concatenates the results: <tt>(MAC ||
ciphertext)</tt>.
* The Coordinator sends the encrypted descriptor record to all
participating Signers.

=3D=3D=3D=3D=3DSigner=3D=3D=3D=3D=3D

* The Signer imports the descriptor record.
* The Signer extracts the <tt>MAC</tt> from the data, sets <tt>IV</tt>
to the first 16 bytes of the <tt>MAC</tt>, then decrypts the
ciphertext using the <tt>ENCRYPTION_KEY</tt> (derived from the open
session) and <tt>IV</tt>.
* The Signer verifies that the included <tt>MAC</tt> is valid given
the plaintext.
* The Signer verifies that it can support the included specification versio=
n.
* The Signer verifies that it is compatible with the derivation path
restrictions.
* The Signer verifies the descriptor=E2=80=99s <tt>CHECKSUM</tt>.
* The Signer verifies that it can support the descriptor.
* The Signer checks that its <tt>KEY</tt> is included in the
descriptor, using path and fingerprint information provided. The check
must perform an exact match on the <tt>KEY</tt>s and not using
shortcuts such as matching fingerprints, which is trivial to spoof.
* For confirmation, the Signer must display to the user the
<tt>CHECKSUM</tt>, the derivation path restrictions and the policy
parameters, such as <tt>M</tt>, <tt>N</tt> and the position(s) of its
own XPUB in the policy script. The total number of Signers,
<tt>N</tt>, is important to prevent a <tt>KEY</tt> insertion attack.
The position is important for scripts where key order matters. When
applicable, all positions of the XPUB must be displayed. The full
descriptor must also be available for review upon user request.
* When possible, the Signer should also show a preview of the first
address(es) of the wallet.
* Parties must check with each other that all Signers have verified
the descriptor and has the same confirmation (except for the key
positions).
* If all checks pass, the Signer must persist the descriptor record in
its storage.

This completes the setup.

=3D=3D=3DEncryption=3D=3D=3D

=3D=3D=3D=3DThe Token=3D=3D=3D=3D
We define three modes of encryption.

# <tt>NO_ENCRYPTION</tt> : the <tt>TOKEN</tt> is set to <tt>0</tt>.
Encryption is disabled.
# <tt>STANDARD</tt> : the <tt>TOKEN</tt> is a 64-bit nonce.
# <tt>EXTENDED</tt> : the <tt>TOKEN</tt> is a 96-bit nonce.

The <tt>TOKEN</tt> can be converted to one of these formats:
* A decimal number (recommended). The number must not exceed the
maximum value of the nonce.
* A mnemonic phrase using
[https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
BIP-0039] word list (6 words in <tt>STANDARD</tt> mode; 9 words in
<tt>EXTENDED</tt> mode).
* A QR code.
* Other formats.

The flexibility in the data format allows each Signer to customize the
User Experience based on its respective capabilities.

=3D=3D=3D=3DKey Derivation=3D=3D=3D=3D
The key derivation function is [https://tools.ietf.org/html/rfc2898
PBKDF2], with PRF =3D SHA512. Specifically:

<tt>DKey =3D PBKDF2(PRF, Password, Salt, c, dkLen)</tt>

Whereas:

* PRF =3D SHA512
* Password =3D "No SPOF"
* Salt =3D <tt>TOKEN</tt>
* c =3D 2048
* dkLen =3D 256
* DKey =3D Derived <tt>ENCRYPTION_KEY</tt>

=3D=3D=3D=3DEncryption Scheme=3D=3D=3D=3D
The encryption scheme is [https://tools.ietf.org/html/rfc3686 AES-256-CTR].

<tt>MAC =3D HMAC-SHA256(HMAC_Key, hex-encoded TOKEN || Data)</tt>

<tt>IV =3D First 16 bytes of MAC</tt>

<tt>Ciphertext =3D AES-256-CTR-Encrypt(Plaintext, DKey, IV)</tt>

<tt>Plaintext =3D AES-256-CTR-Decrypt(Ciphertext, DKey, IV)</tt>

Whereas:
* DKey =3D <tt>ENCRYPTION_KEY</tt>
* HMAC_Key =3D SHA256(<tt>ENCRYPTION_KEY</tt>)
* Data =3D the plaintext, e.g. the entire key record in round 1 and the
entire descriptor record in round 2

The <tt>MAC</tt> is to be sent along with the key and descriptor
record, as specified above. Because it is a <tt>MAC</tt> over the
entire plaintext, this is essentially an
[https://en.wikipedia.org/wiki/Authenticated_encryption#Encrypt-and-MAC_(E&=
M)
Encrypt-and-MAC] form of authenticated encryption.

=3D=3DQR Codes=3D=3D
For signers that use QR codes to transmit data, key and descriptor
records can be converted to QR codes, following
[https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-=
005-ur.md
the BCR standard].

Also refer to [https://github.com/BlockchainCommons/Research/blob/master/pa=
pers/bcr-2020-015-account.md
UR Type Definition for BIP44 Accounts] and
[https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-=
010-output-desc.md
UR Type Definition for Bitcoin Output Descriptors] for more details.

=3D=3DSecurity=3D=3D

This proposal introduces two layers of protection. The first one is a
temporary, secret <tt>TOKEN</tt>. The second one is the descriptor
<tt>CHECKSUM</tt>.

The <tt>TOKEN</tt> is used to encrypt the two rounds of communication
between the Signer and the Coordinator. A <tt>MAC</tt> is also
generated from the <tt>TOKEN</tt> and plaintext to authenticate the
data being exchanged. The <tt>TOKEN</tt> is only needed during the
setup phase, and can be safely discarded afterwards.

The descriptor <tt>CHECKSUM</tt>, on the other hand, can be used to
verify the integrity of the multisig configuration. An attacker who
tampers with the multisig configuration must also change the
descriptor <tt>CHECKSUM</tt>. Parties must check with each other that
all Signers have the same <tt>CHECKSUM</tt>, along with the policy
parameters, to reduce the chance of tampering. The <tt>CHECKSUM</tt>
must be persisted along with the descriptor in each Signer=E2=80=99s storag=
e.

The <tt>TOKEN</tt> and the <tt>CHECKSUM</tt> can=E2=80=99t guarantee comple=
te
protection, since that depends on the overall security of all parties
in the setup, but they can make it significantly harder for an
attacker to tamper with the multisig configuration.

=3D=3DPrivacy=3D=3D
Encryption helps improve the privacy of the wallet by avoiding sharing
XPUBs and descriptors in plaintext.

If the parties wish to have stronger privacy, it is recommended to use
a higher number of bits for the <tt>TOKEN</tt>, and to completely
erase knowledge of the <tt>TOKEN</tt> after the multisig wallet has
been set up.

=3D=3DTest Vectors=3D=3D

=3D=3D=3DMode: <tt>NO_ENCRYPTION</tt>=3D=3D=3D
=3D=3D=3D=3DROUND 1=3D=3D=3D=3D
* Coordinator
** M-of-N: 2/2
** ADDRESS_TYPE: NATIVE_SEGWIT
** TOKEN: 0

* Signer 1
** MASTER_KEY_FINGERPRINT: 539f3d89
** PRIVATE_KEY (m/48'/0'/0'/2'):
KyoXqiwiz6qm21BSYebiZFfNF7obkhiJW6TdPMZTQQMF4kZtfD78
** XPUB (m/48'/0'/0'/2'):
xpub6ETerig7tq89mtaD8Gau2xRWxouRMBy6XHqciA8GZzC2dJv3w6FxfgoegH4b2qYF4oG6VBr=
hpLrauPs5E1q58GLCnhKp6g9QsV9ZA7J5JNa
** Legacy signature
** <tt>signer_1_key.bsms</tt>:
<pre>BSMS 1.0
00
[539f3d89/48'/0'/0'/2']xpub6ETerig7tq89mtaD8Gau2xRWxouRMBy6XHqciA8GZzC2dJv3=
w6FxfgoegH4b2qYF4oG6VBrhpLrauPs5E1q58GLCnhKp6g9QsV9ZA7J5JNa
Signer 1 key
IPXsnNSZb8M6H4fAWtpjAc75hyHHd89fskpM5o7qFg+mPDzEPc1k2mjuIpVIIzaCe45FwPfAAa9=
1RaStfC5Sak0=3D</pre>

* Signer 2
** MASTER_KEY_FINGERPRINT: f8b12aa6
** PRIVATE_KEY (m/48'/0'/0'/2'):
L1zht7muKnUYFMdzC3jwXd78u8tGoKr46AXGh4waF9nphUYWq7ow
** XPUB (m/48'/0'/0'/2'):
xpub6EWPNhGSX86SN4J2DrBUaQ826o6V4egHqAJZUDJqnsthv9CcjBZV79u68M3YZkuTJnJBXfC=
rHuJy97fkVurntwgt3V7Ms5hXpJV2vS8fQZM
** Legacy signature
** <tt>signer_2_key.bsms</tt>:
<pre>BSMS 1.0
00
[f8b12aa6/48'/0'/0'/2']xpub6EWPNhGSX86SN4J2DrBUaQ826o6V4egHqAJZUDJqnsthv9Cc=
jBZV79u68M3YZkuTJnJBXfCrHuJy97fkVurntwgt3V7Ms5hXpJV2vS8fQZM
Signer 2 key
H38+lp9iaesBeCN05BDTH/SnmarlH6+X+Kmw1pgCk+c1Pc1evYIdBag9Nc0nsKhvPtfEbRt9r/q=
sUVZ5onCtBTc=3D</pre>

=3D=3D=3D=3DROUND 2=3D=3D=3D=3D
* Coordinator
** <tt>my_multisig_wallet.bsms</tt>:
<pre>BSMS 1.0
/0/*,/1/*
wsh(sortedmulti(2,[539f3d89/48'/0'/0'/2']xpub6ETerig7tq89mtaD8Gau2xRWxouRMB=
y6XHqciA8GZzC2dJv3w6FxfgoegH4b2qYF4oG6VBrhpLrauPs5E1q58GLCnhKp6g9QsV9ZA7J5J=
Na/*,[f8b12aa6/48'/0'/0'/2']xpub6EWPNhGSX86SN4J2DrBUaQ826o6V4egHqAJZUDJqnst=
hv9CcjBZV79u68M3YZkuTJnJBXfCrHuJy97fkVurntwgt3V7Ms5hXpJV2vS8fQZM/*))#fntxdj=
7p</pre>

=3D=3D=3DMode: <tt>STANDARD</tt> Encryption=3D=3D=3D
=3D=3D=3D=3DROUND 1=3D=3D=3D=3D
* Coordinator
** M-of-N: 2/2
** ADDRESS_TYPE: NATIVE_SEGWIT
** TOKEN (hex): 1ed4ba49e96336b8
*** TOKEN (decimal): 2221605342811469496
*** TOKEN (mnemonic): burst place mystery spot cricket foster
** ENCRYPTION_KEY (hex):
72185a0e25b4efc5d6ac0f8ed32b0165199100e32385040e3a48eb30164bf492

* Signer 1
** MASTER_KEY_FINGERPRINT: 98d79e95
** PRIVATE_KEY (m/48'/0'/0'/2'):
KydC7hZFtWe56oQUAw14HvQ3gKeKVd3m8frFgVMxUqpuhKHvcmm3
** XPUB (m/48'/0'/0'/2'):
xpub6DvvwHS5pd1D36xt4YBGJvtdThWXfn8L9qRj9DbFMExMeP6eBE6Aw9WyBC7XUQwiPPDFuri=
rewsKZpYv68yTV5RBy7SZmw45QEkaLka5BCt
** Legacy signature
** <tt>signer_1_key.bsms</tt>:
<pre>BSMS 1.0
1ed4ba49e96336b8
[98d79e95/48'/0'/0'/2']xpub6DvvwHS5pd1D36xt4YBGJvtdThWXfn8L9qRj9DbFMExMeP6e=
BE6Aw9WyBC7XUQwiPPDFurirewsKZpYv68yTV5RBy7SZmw45QEkaLka5BCt
Signer 1 key
HxtPoP0DrQSac/7ypcwC07R2s6jjpXR6Li2Q92zXj/FSIMQcV5yOU0/ONsDgHXamq0gD5DfPbvu=
VCp9ZJubclV4=3D</pre>

* Signer 1 encryption
** HMAC_KEY (hex):
4dab3988cbc683ad7a8c93d43f9b11a78b63a93d5e33ea19c603f4b7b87ac284
** MAC (hex): afe99e92f0eadc3308eb990045e90a4f54e9f59d22aae5034ac3d866d29c5=
08d
** IV (hex) : afe99e92f0eadc3308eb990045e90a4f
** CIPHERTEXT (hex):
214ec9a861a238ba7f0412305a97a6e0faa332be15af09127e131d669e5d55d73891580a580=
8cea5d2bf39f43496d3c0f8236eff3854fcc7446daf9d2b58fd40d97ce3b1745de2959e2976=
7039b99969821400eca0c3517fae56d2d24d5235a3430af1ed894b68681d706cce7c75adf35=
d8580603aa302bc01fef06d0336a37f19dd46100baa9e4eabd8796a810e13941ad0980c126a=
d55d6a4bbef11a7bf893b7d2ed8fb0d8324c4c9b512d4d1e75096c63511e15018fc832816b5=
639d58fc28c60c049487d04bd5a6cb32aa1381d0809660d54376b9f63325c18cfd1ac502408=
8e74cb703fe165972cc4485abb1feefe92a0b4ea297fe2f4f7416eeee1efc9b942540931ef
** <tt>signer_1_key.dat</tt>:
<pre>afe99e92f0eadc3308eb990045e90a4f54e9f59d22aae5034ac3d866d29c508d214ec9=
a861a238ba7f0412305a97a6e0faa332be15af09127e131d669e5d55d73891580a5808cea5d=
2bf39f43496d3c0f8236eff3854fcc7446daf9d2b58fd40d97ce3b1745de2959e29767039b9=
9969821400eca0c3517fae56d2d24d5235a3430af1ed894b68681d706cce7c75adf35d85806=
03aa302bc01fef06d0336a37f19dd46100baa9e4eabd8796a810e13941ad0980c126ad55d6a=
4bbef11a7bf893b7d2ed8fb0d8324c4c9b512d4d1e75096c63511e15018fc832816b5639d58=
fc28c60c049487d04bd5a6cb32aa1381d0809660d54376b9f63325c18cfd1ac5024088e74cb=
703fe165972cc4485abb1feefe92a0b4ea297fe2f4f7416eeee1efc9b942540931ef</pre>

* Signer 2
** MASTER_KEY_FINGERPRINT: 3e94b5a1
** PRIVATE_KEY (m/48'/0'/0'/2'):
KyPh5XYjExjNHPiBjYhp8iAntAehrDziiwRv7y9Ln6eK9QU2xP55
** XPUB (m/48'/0'/0'/2'):
xpub6E1W1DUYY29V2b8czCcpi36GG2uD33B11vwNopgTZwsVyfgAkA4kPCqLP5R4YzaRvzW17CQ=
rDkgmDQbA848AdkR7W18nNvMKXzzCBSnZP9c
** Legacy signature
** <tt>signer_2_key.bsms</tt>:
<pre>BSMS 1.0
1ed4ba49e96336b8
[3e94b5a1/48'/0'/0'/2']xpub6E1W1DUYY29V2b8czCcpi36GG2uD33B11vwNopgTZwsVyfgA=
kA4kPCqLP5R4YzaRvzW17CQrDkgmDQbA848AdkR7W18nNvMKXzzCBSnZP9c
Signer 2 key
ILR49QLy9+xkMS11TIXJRSMgOQOzGbAaooq4/ZRcd8VgM6j5upJMI0mjJHseQOMYSGk8FqjXZbM=
vBGyiX9wdutM=3D</pre>

* Signer 2 encryption
** HMAC_KEY (hex):
4dab3988cbc683ad7a8c93d43f9b11a78b63a93d5e33ea19c603f4b7b87ac284
** MAC (hex): 5c7cb2ac407cd60b1f2b86ef46077d3a312b6ce921df2a141347e8bf1e5c6=
573
** IV (hex) : 5c7cb2ac407cd60b1f2b86ef46077d3a
** CIPHERTEXT (hex):
f23e6c76ff45d308dea6014030a274127ad437228f1d5ec2431d2ea9e3cedd5b0a207a9efa6=
f926d5420205003f3cb9c4b82b2d595180e62a173a2e5aa0322de48a70a873f641bdae1764e=
6b1667c241e0fe03a4ccdc3fe0cfa5f75b239d6497c3b69dca17bb685ba70b307d1243836d8=
fb198ce727cfae4057ee0b4fdcb09f4ba5ae127f49c5de780edb4e40aec96303c8a7b98b1b8=
e53dd5e07e01d4f3ffd836763209a1f0cbc61adcfdc2951e77528ee7b6e68114c3a4bec3887=
5d285021e68ae8aa913bb1e2e65dd52c649a0e98bfb4e8bab6dd10295c1167a0854ba44f094=
feb75d2fb00c944f07d4b47114f483df9838459316f3ddbc4a82e6507881931f8e20f5b805
** <tt>signer_2_key.dat</tt>:
<pre>5c7cb2ac407cd60b1f2b86ef46077d3a312b6ce921df2a141347e8bf1e5c6573f23e6c=
76ff45d308dea6014030a274127ad437228f1d5ec2431d2ea9e3cedd5b0a207a9efa6f926d5=
420205003f3cb9c4b82b2d595180e62a173a2e5aa0322de48a70a873f641bdae1764e6b1667=
c241e0fe03a4ccdc3fe0cfa5f75b239d6497c3b69dca17bb685ba70b307d1243836d8fb198c=
e727cfae4057ee0b4fdcb09f4ba5ae127f49c5de780edb4e40aec96303c8a7b98b1b8e53dd5=
e07e01d4f3ffd836763209a1f0cbc61adcfdc2951e77528ee7b6e68114c3a4bec38875d2850=
21e68ae8aa913bb1e2e65dd52c649a0e98bfb4e8bab6dd10295c1167a0854ba44f094feb75d=
2fb00c944f07d4b47114f483df9838459316f3ddbc4a82e6507881931f8e20f5b805</pre>

=3D=3D=3D=3DROUND 2=3D=3D=3D=3D
*Coordinator
** <tt>my_multisig_wallet.bsms</tt>:
<pre>BSMS 1.0
/0/*,/1/*
wsh(sortedmulti(2,[98d79e95/48'/0'/0'/2']xpub6DvvwHS5pd1D36xt4YBGJvtdThWXfn=
8L9qRj9DbFMExMeP6eBE6Aw9WyBC7XUQwiPPDFurirewsKZpYv68yTV5RBy7SZmw45QEkaLka5B=
Ct/*,[3e94b5a1/48'/0'/0'/2']xpub6E1W1DUYY29V2b8czCcpi36GG2uD33B11vwNopgTZws=
VyfgAkA4kPCqLP5R4YzaRvzW17CQrDkgmDQbA848AdkR7W18nNvMKXzzCBSnZP9c/*))#x0lx92=
qk</pre>

*Coordinator encryption
** HMAC_KEY (hex):
4dab3988cbc683ad7a8c93d43f9b11a78b63a93d5e33ea19c603f4b7b87ac284
** MAC (hex): df3d06db6c8b8a5f25de202e10ea225df6415d1ed0e36c64cc2be1b7e86c2=
a38
** IV (hex) : df3d06db6c8b8a5f25de202e10ea225d
** CIPHERTEXT (hex):
2761e6bfe839586b4c90954200bc4ce6d39ef164c5d14997755575d1691ee249ffd20beda52=
6f57a7424907f839c6c2e3ecd46889ede290a2c81de22d3f33a7fa5e55ec95c0e26005c596d=
0f6346f819823f361f9f9f54d1eae48b325240d66c5888bd5ebab843061dcdd73b675346da9=
82646c83026694d757661d31c2d654fb263c9ab3e874a258bc234c48532f15e9450c982fcf1=
61404746e9f23d25e17b74139cd799983fd0c7a7a0386a823d3789b4578879a764172cc8ef9=
6ab003eee24f6288007d31e2b999aff5a6d30cc524a0111a99730a29cf28ae41dbff6ce21ca=
6bc1df37074228178048e835584e6e70dba941154d024cd03cb6c56d0bde441ce464aa749de=
5e814dd30e21b75f62e831ac1f28eda1a7ba7e122076789e284402c8ba85b5a0e864bce220e=
3c78fa2f465e2bcf6b1d378816319de99f99ce7068
** <tt>my_multisig_wallet.dat</tt>:
<pre>df3d06db6c8b8a5f25de202e10ea225df6415d1ed0e36c64cc2be1b7e86c2a382761e6=
bfe839586b4c90954200bc4ce6d39ef164c5d14997755575d1691ee249ffd20beda526f57a7=
424907f839c6c2e3ecd46889ede290a2c81de22d3f33a7fa5e55ec95c0e26005c596d0f6346=
f819823f361f9f9f54d1eae48b325240d66c5888bd5ebab843061dcdd73b675346da982646c=
83026694d757661d31c2d654fb263c9ab3e874a258bc234c48532f15e9450c982fcf1614047=
46e9f23d25e17b74139cd799983fd0c7a7a0386a823d3789b4578879a764172cc8ef96ab003=
eee24f6288007d31e2b999aff5a6d30cc524a0111a99730a29cf28ae41dbff6ce21ca6bc1df=
37074228178048e835584e6e70dba941154d024cd03cb6c56d0bde441ce464aa749de5e814d=
d30e21b75f62e831ac1f28eda1a7ba7e122076789e284402c8ba85b5a0e864bce220e3c78fa=
2f465e2bcf6b1d378816319de99f99ce7068</pre>

=3D=3D=3DMode: <tt>EXTENDED</tt> Encryption=3D=3D=3D
=3D=3D=3D=3DROUND 1=3D=3D=3D=3D
*Coordinator
** M-of-N: 2/3
** ADDRESS_TYPE: NESTED_SEGWIT
** TOKEN for Signer 1 (hex): 654d63309464afcda558c6aa
*** TOKEN (decimal): 31351541690484562733651510954
*** TOKEN (mnemonic): grab help slow churn enough traffic nice boat price
*** ENCRYPTION_KEY (hex):
4073adac2351e164b8d68039abd9d4b8e4d07adccfdf73ece6e236d60b107802
** TOKEN for Signer 2 (hex): b0344f51d5cb04083d598fa3
*** TOKEN (decimal): 54532600447720520868878192547
*** TOKEN (mnemonic): rabbit pen stamp process raccoon advice voice
cradle person
*** ENCRYPTION_KEY (hex):
6bae6b670e257d7468c3e90194029dd468a2f39d8b9a3ff187b08209b1d409b6
** TOKEN for Signer 3 (hex): 163fd307195982c4c39d50bb
*** TOKEN (decimal): 6885829092987042066541138107
*** TOKEN (mnemonic): bike write scrub crawl oblige give attack present roo=
kie
*** ENCRYPTION_KEY (hex):
c78b94589214b6dc98b337ba4ce54380553ed00a1e5b1955fc540ce3b30d6566

* Signer 1
** MASTER_KEY_FINGERPRINT: 110dc257
** PRIVATE_KEY (m/48'/0'/0'/1'):
KzshDDEBhzyiwXHoyE7ZiLegzztEy54AG6Wq8N844LqHSQMHt4Ji
** XPUB (m/48'/0'/0'/1'):
xpub6EPQbDFezXYvVFHqnc8R7QUSE8hTepbyCXU7jJBT4dVm2rQHe1i6isqoj59qhyBiCdKquo6=
QsgMZNHvEz3BM4cNSszF25siTqLUCznBm8vk
** Legacy signature
** <tt>signer_1_key.bsms</tt>:
<pre>BSMS 1.0
654d63309464afcda558c6aa
[110dc257/48'/0'/0'/1']xpub6EPQbDFezXYvVFHqnc8R7QUSE8hTepbyCXU7jJBT4dVm2rQH=
e1i6isqoj59qhyBiCdKquo6QsgMZNHvEz3BM4cNSszF25siTqLUCznBm8vk
Signer 1 key
IDX6xLdM4XjetYPvVfpVBXAfT7oE3tHAOB4blZpbIst8bjJ+LbDeP4tZl4O8utAuys9igXE0G3k=
aHz1mg/+OU8w=3D</pre>

* Signer 1 encryption
** HMAC_KEY (hex):
f43c359a4b3d7b2e01be73c54519b12545ca9a23a86f824aadf577b314a7caa7
** MAC (hex): 40b6b43e2f1bc01b748eb242235d7e09fa8a2fd6cebe35784cf3adf81910e=
c98
** IV (hex) : 40b6b43e2f1bc01b748eb242235d7e09
** CIPHERTEXT (hex):
0877987764401c27e6c60ed2f1bb89dff1dbc5e8204149f682d53049bffe39553f24af3928a=
a2f78ac2d04ac5baa0c3ec39aaccf0d258e7bb6659a7b92e92f2c2784a94f4df8e8af2270d9=
d411bfff2cfb9f71b4e1ac87561c7d2ac57ca86a1f9716d5da7571719d24830fc8d015a0daf=
04b3742439484488798335357f2eeaa8e2db2ba630f9dffd88236e327ab5bfcfb6e29ee3ef6=
cc18e0b71c1731465c2351e76b92f7b1bd28ef6eff5414c22aa6c80090fa59b973c22e3044e=
92dbf3688990a49a42828e52c1e686f1193dcdf7b7118930e01419fe938c6811c58c84c36d6=
92fd52846f998bc328471f1e73c22261791a08cda096ee3ac8b37f31afd0b1d9c335ff9ac67=
ff230eb0d69f2d7
** <tt>signer_1_key.dat</tt>:
<pre>40b6b43e2f1bc01b748eb242235d7e09fa8a2fd6cebe35784cf3adf81910ec98087798=
7764401c27e6c60ed2f1bb89dff1dbc5e8204149f682d53049bffe39553f24af3928aa2f78a=
c2d04ac5baa0c3ec39aaccf0d258e7bb6659a7b92e92f2c2784a94f4df8e8af2270d9d411bf=
ff2cfb9f71b4e1ac87561c7d2ac57ca86a1f9716d5da7571719d24830fc8d015a0daf04b374=
2439484488798335357f2eeaa8e2db2ba630f9dffd88236e327ab5bfcfb6e29ee3ef6cc18e0=
b71c1731465c2351e76b92f7b1bd28ef6eff5414c22aa6c80090fa59b973c22e3044e92dbf3=
688990a49a42828e52c1e686f1193dcdf7b7118930e01419fe938c6811c58c84c36d692fd52=
846f998bc328471f1e73c22261791a08cda096ee3ac8b37f31afd0b1d9c335ff9ac67ff230e=
b0d69f2d7</pre>

* Signer 2
** MASTER_KEY_FINGERPRINT: 5c890401
** PRIVATE_KEY (m/48'/0'/0'/1'):
L41Jnc9CdBtBJd18429MDGcTgP2DNoXaKyyGr271ndTprvrHXDQf
** XPUB (m/48'/0'/0'/1'):
xpub6EW1SmjSXq9YwVwcan5qWEncgx89SozMvGNpYF6hfZHYNTikNZ4gsXuVhHTi6xYJCkmY4X4=
wpPPS5Gr7aY39dVJMS2TGfihr25oaspKtU8q
** Legacy signature
** <tt>signer_2_key.bsms</tt>:
<pre>BSMS 1.0
b0344f51d5cb04083d598fa3
[5c890401/48'/0'/0'/1']xpub6EW1SmjSXq9YwVwcan5qWEncgx89SozMvGNpYF6hfZHYNTik=
NZ4gsXuVhHTi6xYJCkmY4X4wpPPS5Gr7aY39dVJMS2TGfihr25oaspKtU8q
Signer 2 key
H5kN6UHaK2xACB6iYdTxxQPD8qyFEYv9iMsQs5B0MRfCM7NA5GB+7EFgmBpSctwt6B122zWBr6m=
RjpYjKmj+7hs=3D</pre>

* Signer 2 encryption
** HMAC_KEY (hex):
e0a20b5f5285fbaa35aad08fb70f5626c9abbe1b384a4950735b28aca6325ff2
** MAC (hex): 3a6deec8dbdbd6606a52c7d7e64eca4f972a293cbabac6f62736629fbe779=
28a
** IV (hex) : 3a6deec8dbdbd6606a52c7d7e64eca4f
** CIPHERTEXT (hex):
bb0fb72f61b0c4858bd9c65235390b67651b94c4b0329238b0116dd6d3365ade33cb1c1b161=
9638968791a5d2d1d263d90280bdad8d9ca24c34a78e320076e0dccf59e7f729b541b44bbe4=
0ba803dedd3b17c49765377cb2d913a856b86c3dd383dab475790e89226ed8ef2301574212d=
2809ed9c099aa67be434024ee2a4e82a146300acf755863da64807cb7bb2636f6616489636d=
254a870778d3540832aea44abac4328b5d90f3e6045ef36a526ce5d575f2305e3e4699dccbc=
713e9e68f50364036c1054c2a506aab77ea7c43a89536947c24330b09a62a90c3b4ae2d452f=
96ef34ec871af2c52d68ddede2503c87e2ba68d5cf9be589457879e06021ea6a6176f7dded8=
20ba4c0e709e2a2
** <tt>signer_2_key.dat</tt>:
<pre>3a6deec8dbdbd6606a52c7d7e64eca4f972a293cbabac6f62736629fbe77928abb0fb7=
2f61b0c4858bd9c65235390b67651b94c4b0329238b0116dd6d3365ade33cb1c1b161963896=
8791a5d2d1d263d90280bdad8d9ca24c34a78e320076e0dccf59e7f729b541b44bbe40ba803=
dedd3b17c49765377cb2d913a856b86c3dd383dab475790e89226ed8ef2301574212d2809ed=
9c099aa67be434024ee2a4e82a146300acf755863da64807cb7bb2636f6616489636d254a87=
0778d3540832aea44abac4328b5d90f3e6045ef36a526ce5d575f2305e3e4699dccbc713e9e=
68f50364036c1054c2a506aab77ea7c43a89536947c24330b09a62a90c3b4ae2d452f96ef34=
ec871af2c52d68ddede2503c87e2ba68d5cf9be589457879e06021ea6a6176f7dded820ba4c=
0e709e2a2</pre>

* Signer 3
** MASTER_KEY_FINGERPRINT: 614cbf5f
** PRIVATE_KEY (m/48'/0'/0'/1'):
L2ccRLzH7GfVxWpU8YSY9y5UGyRoqW3UdeNT1vGfVbxAGhwU5qhD
** XPUB (m/48'/0'/0'/1'):
xpub6F9TfWTFcMYy5Ycd2ka2az1brJj78J2isLAWptZnCpFsesss5sZv5B8xsgt71ZXfhDWhUtf=
4vng4zY6HUVrQbDMPDYRLYvFFoLnAYfzgYPH
** Legacy signature
** <tt>signer_3_key.bsms</tt>:
<pre>BSMS 1.0
163fd307195982c4c39d50bb
[614cbf5f/48'/0'/0'/1']xpub6F9TfWTFcMYy5Ycd2ka2az1brJj78J2isLAWptZnCpFsesss=
5sZv5B8xsgt71ZXfhDWhUtf4vng4zY6HUVrQbDMPDYRLYvFFoLnAYfzgYPH
Signer 3 key
H0jf2JMtke5zDDIWys6fihOCA6QBmC5+hbgVB/c2mMPNPLB6tDXt0TFZU1f9wvaCR9762anKSc8=
CCqXLogw8V00=3D</pre>

* Signer 3 encryption
** HMAC_KEY (hex):
1f51ea067c121e2f86af5e1d484905046bc63e861573157d8b1ae9e7e47e224b
** MAC (hex): 1a5624fcb39cebabb6174456173eec19b756bc916cf2c9d815e9bcce07089=
8c4
** IV (hex) : 1a5624fcb39cebabb6174456173eec19
** CIPHERTEXT (hex):
48d6e139bdc8c19e93cbbf5b4478340c8cf08aa91c28803084d5f58618773f7e615e0134492=
b496c4e7c130351c0350701f686918033f621378552d7040efedd5539d38c258bf936475de7=
75f23da3953fe3ba5bbbd24816b8902b87a9a09700c446b085119dedee2395dd69665e742f7=
2f2fb6da4ebe3f4704eaf45486fbfb84d764b718cc0b756e72f72ab6069d47765bdd3ebd407=
4af4fa99a95691a659675ce5f72235c28ddf3c3d53179e598cddc967fc896adc6e97edeeffc=
85b9e44611df748d923ff3dd921ad4d6e98e0de12359a37558e326faf585ba57e73ab45bc4a=
49f6e8a756f365f5d204e70f7c7bed269e81e9524a41e5d4cbaad0b6b442d6eea1e5da1ca34=
5cc665a0cffe2c3
** <tt>signer_3_key.dat</tt>:
<pre>1a5624fcb39cebabb6174456173eec19b756bc916cf2c9d815e9bcce070898c448d6e1=
39bdc8c19e93cbbf5b4478340c8cf08aa91c28803084d5f58618773f7e615e0134492b496c4=
e7c130351c0350701f686918033f621378552d7040efedd5539d38c258bf936475de775f23d=
a3953fe3ba5bbbd24816b8902b87a9a09700c446b085119dedee2395dd69665e742f72f2fb6=
da4ebe3f4704eaf45486fbfb84d764b718cc0b756e72f72ab6069d47765bdd3ebd4074af4fa=
99a95691a659675ce5f72235c28ddf3c3d53179e598cddc967fc896adc6e97edeeffc85b9e4=
4611df748d923ff3dd921ad4d6e98e0de12359a37558e326faf585ba57e73ab45bc4a49f6e8=
a756f365f5d204e70f7c7bed269e81e9524a41e5d4cbaad0b6b442d6eea1e5da1ca345cc665=
a0cffe2c3</pre>

=3D=3D=3D=3DROUND 2=3D=3D=3D=3D
* Coordinator
** <tt>my_multisig_wallet.bsms</tt>:
<pre>BSMS 1.0
/0/*,/1/*
sh(wsh(multi(2,[110dc257/48'/0'/0'/1']xpub6EPQbDFezXYvVFHqnc8R7QUSE8hTepbyC=
XU7jJBT4dVm2rQHe1i6isqoj59qhyBiCdKquo6QsgMZNHvEz3BM4cNSszF25siTqLUCznBm8vk/=
*,[5c890401/48'/0'/0'/1']xpub6EW1SmjSXq9YwVwcan5qWEncgx89SozMvGNpYF6hfZHYNT=
ikNZ4gsXuVhHTi6xYJCkmY4X4wpPPS5Gr7aY39dVJMS2TGfihr25oaspKtU8q/*,[614cbf5f/4=
8'/0'/0'/1']xpub6F9TfWTFcMYy5Ycd2ka2az1brJj78J2isLAWptZnCpFsesss5sZv5B8xsgt=
71ZXfhDWhUtf4vng4zY6HUVrQbDMPDYRLYvFFoLnAYfzgYPH/*)))#j3ykhz7f</pre>

* Send to Signer 1:
** HMAC_KEY (hex):
f43c359a4b3d7b2e01be73c54519b12545ca9a23a86f824aadf577b314a7caa7
** MAC (hex): ee74a0f50943d7d1b65270028bb05133e87c832cdc1ef0a07c79db2093ca3=
432
** IV (hex) : ee74a0f50943d7d1b65270028bb05133
** CIPHERTEXT (hex):
8e3ba3dac0f979fad0d160bd00c8294ff1726d51b95ff3e1534e5a1900f3d7cd4f6d929985a=
94b9da2c11e4e0f7770cc53c6739fd099477323bd26a3eca9c8016e79848d15e274463424b8=
355cd73cced61f1816ac8bac87f8c650ee9052f50e347c52ad24b00794a9d5523714be2fdcf=
731f14b7a8d7c93eab44c258e1c417d2837b9676832e8ce7239dc28b4e1166803209947b8a8=
75a99b9478ee94f7bc17399e886179ab2a0285dc11a3883f6fa439d0f2277dadbec8c355c37=
9fc50e945897e1a738f6a55b09f6b8b6bdf6d4bc248219cbad3662a78a2f539c989e055e00b=
8efd42fbff978e1a5cc10f83df56117ece4d17f94a0a6d3803778ed53531419250c5a0fff6c=
ad4ab401468dd054915b068cc8826ae1308a71b38060d68c9248d59eea11c2c52a66d5f6bc0=
d7ae6cb44305c36e56068456d293b70037902e7b05a3ee0af710201128dffc0c16c3306b66b=
d19b9ae5b91aded35ef33f07743e5b185a9f88a5c67d40270e3bbcf592167ceaf82ead69372=
8d5129b50075edd5ce24863f3484b4b063599ed1327e1c87d0a2051fed3b1234a702722b686=
e4c9392a403b79726800dd6b691e516e44d9e836c190b10cf2bb262bba98293c97f2c323e59=
acd0a1f988c5
** <tt>my_multisig_wallet_for_signer_1.dat</tt>:
<pre>ee74a0f50943d7d1b65270028bb05133e87c832cdc1ef0a07c79db2093ca34328e3ba3=
dac0f979fad0d160bd00c8294ff1726d51b95ff3e1534e5a1900f3d7cd4f6d929985a94b9da=
2c11e4e0f7770cc53c6739fd099477323bd26a3eca9c8016e79848d15e274463424b8355cd7=
3cced61f1816ac8bac87f8c650ee9052f50e347c52ad24b00794a9d5523714be2fdcf731f14=
b7a8d7c93eab44c258e1c417d2837b9676832e8ce7239dc28b4e1166803209947b8a875a99b=
9478ee94f7bc17399e886179ab2a0285dc11a3883f6fa439d0f2277dadbec8c355c379fc50e=
945897e1a738f6a55b09f6b8b6bdf6d4bc248219cbad3662a78a2f539c989e055e00b8efd42=
fbff978e1a5cc10f83df56117ece4d17f94a0a6d3803778ed53531419250c5a0fff6cad4ab4=
01468dd054915b068cc8826ae1308a71b38060d68c9248d59eea11c2c52a66d5f6bc0d7ae6c=
b44305c36e56068456d293b70037902e7b05a3ee0af710201128dffc0c16c3306b66bd19b9a=
e5b91aded35ef33f07743e5b185a9f88a5c67d40270e3bbcf592167ceaf82ead693728d5129=
b50075edd5ce24863f3484b4b063599ed1327e1c87d0a2051fed3b1234a702722b686e4c939=
2a403b79726800dd6b691e516e44d9e836c190b10cf2bb262bba98293c97f2c323e59acd0a1=
f988c5</pre>

* Send to Signer 2:
** HMAC_KEY (hex):
e0a20b5f5285fbaa35aad08fb70f5626c9abbe1b384a4950735b28aca6325ff2
** MAC (hex): 81df9e064f1de1d5f754c4e20f9286f9d81b856d3965677a9f2430cb9297a=
d1f
** IV (hex) : 81df9e064f1de1d5f754c4e20f9286f9
** CIPHERTEXT (hex):
dcd82038ef627d6cb2deb62d04c4ccbaa3a354633d960e46312c22791f039f23fd9782a1e3a=
63504c1e5b3a0770bb8d32fdf168738b6c03278f1391dd5d01e9aafee7be2c8136ee018feff=
6fc8cdb926df13a36e115ddca8254934f56b7f700768c94cb8388a8297834de9affcd959417=
ae3d6ec3251387904f50f51f06306cc4d36eefc51418dd3b2c5454910a23ec67a40a3b918d2=
a740e812929aae949d8dde2c41cbbb3a2b7c2103788421c147f4794d6a26947c15ef4a99ceb=
825d0c5aaa78b8737d0ef712ba8e269a9941b1af5d217dcdd9cd06727fbdc70fabe3f5a8c09=
acff4e76992be7f27c6b12ca84739f62a6da86e5b79103d632c0dc8ab3f91fddb3cfbe67084=
dc4b861c4ac7c86fb171a058c98c67cffdc40ff17ae1533361cc6fb7b63657af0408cf30bf9=
d6d97aaacf9d3ff443eee61f207228cd91769ce83a0709c1be1847884c6a8fdc86ede66aef8=
e34fc509c49edf30f743bdc8f9052961ee340924ec2d1caadc6fd286bb3e233c153cd08c193=
4127752dc28e0d12efa92a050c4061653edb1cbf2fd4b2ba4e038f0b44f5735f198e92571c0=
29156f65f534bfc149f38d611829901372cfc0176b9d2f9ac6512b7f37941a02dff701df0bc=
eadaacfc6935
** <tt>my_multisig_wallet_for_signer_2.dat</tt>:
<pre>81df9e064f1de1d5f754c4e20f9286f9d81b856d3965677a9f2430cb9297ad1fdcd820=
38ef627d6cb2deb62d04c4ccbaa3a354633d960e46312c22791f039f23fd9782a1e3a63504c=
1e5b3a0770bb8d32fdf168738b6c03278f1391dd5d01e9aafee7be2c8136ee018feff6fc8cd=
b926df13a36e115ddca8254934f56b7f700768c94cb8388a8297834de9affcd959417ae3d6e=
c3251387904f50f51f06306cc4d36eefc51418dd3b2c5454910a23ec67a40a3b918d2a740e8=
12929aae949d8dde2c41cbbb3a2b7c2103788421c147f4794d6a26947c15ef4a99ceb825d0c=
5aaa78b8737d0ef712ba8e269a9941b1af5d217dcdd9cd06727fbdc70fabe3f5a8c09acff4e=
76992be7f27c6b12ca84739f62a6da86e5b79103d632c0dc8ab3f91fddb3cfbe67084dc4b86=
1c4ac7c86fb171a058c98c67cffdc40ff17ae1533361cc6fb7b63657af0408cf30bf9d6d97a=
aacf9d3ff443eee61f207228cd91769ce83a0709c1be1847884c6a8fdc86ede66aef8e34fc5=
09c49edf30f743bdc8f9052961ee340924ec2d1caadc6fd286bb3e233c153cd08c193412775=
2dc28e0d12efa92a050c4061653edb1cbf2fd4b2ba4e038f0b44f5735f198e92571c029156f=
65f534bfc149f38d611829901372cfc0176b9d2f9ac6512b7f37941a02dff701df0bceadaac=
fc6935</pre>

* Send to Signer 3:
** HMAC_KEY (hex):
1f51ea067c121e2f86af5e1d484905046bc63e861573157d8b1ae9e7e47e224b
** MAC (hex): 159a91100cacd123480b7d085c8bb32ec8eb06f0391b6dc8fac07ae67eb37=
b81
** IV (hex) : 159a91100cacd123480b7d085c8bb32e
** CIPHERTEXT (hex):
c7269d8be21d1cfe172e35aa106760f1fdc929fce19da8fb7f74f759efec1ee02796fb1e8b0=
08cf177f60a2021570f17aeeb41f8636858654082734b90959b98fd08419f901683c4ca3e76=
b3e482fea4c67162775e0d80bcb45df729f646c1364a3d8a7d1ff961717b00897e877c1c055=
4d3502942149726806269c546ad2dd34ba286ddf5cd336b83aabf7091fa25e607faf7e54017=
d84113e1e3ec440b3704addea188b89293469306fc0a98570afdcf269026b2d2e760f466c1f=
75bcf75fdf030c0a692e5681fd4487e59d6e96451ff5b6b9f2521b8e95e796ef4ab0a917794=
d91a30fdac7ee9ddbd89d174831bd133ab12a74f52f6283ee2c5fe3d5a957a7c1a15530b2c5=
224f76d90057dc94f2ee34e28b037ae7f518cc6dfe725cd3e657648de82b200ea77830eb932=
19f883998d3207a4ef5902d1119b0cde6b364bc1effb86109d9c2babc8ab26dce90329779d8=
cd0d737e9825a25586aa3c8fa5317e3e433ff235b82f629de0504e3c992f8e8de299f62751b=
c1fcb2e75e0262c7a27be7068cea69b14f303e97c24b99ed29cae142564e285657704b4c411=
d0d4f8c58819e2c0e0ffc3667eb5a408aad8a3023a5f00875e7deab95dc365d8757f7b79815=
a4fd9e6de2b3
** <tt>my_multisig_wallet_for_signer_3.dat</tt>:
<pre>159a91100cacd123480b7d085c8bb32ec8eb06f0391b6dc8fac07ae67eb37b81c7269d=
8be21d1cfe172e35aa106760f1fdc929fce19da8fb7f74f759efec1ee02796fb1e8b008cf17=
7f60a2021570f17aeeb41f8636858654082734b90959b98fd08419f901683c4ca3e76b3e482=
fea4c67162775e0d80bcb45df729f646c1364a3d8a7d1ff961717b00897e877c1c0554d3502=
942149726806269c546ad2dd34ba286ddf5cd336b83aabf7091fa25e607faf7e54017d84113=
e1e3ec440b3704addea188b89293469306fc0a98570afdcf269026b2d2e760f466c1f75bcf7=
5fdf030c0a692e5681fd4487e59d6e96451ff5b6b9f2521b8e95e796ef4ab0a917794d91a30=
fdac7ee9ddbd89d174831bd133ab12a74f52f6283ee2c5fe3d5a957a7c1a15530b2c5224f76=
d90057dc94f2ee34e28b037ae7f518cc6dfe725cd3e657648de82b200ea77830eb93219f883=
998d3207a4ef5902d1119b0cde6b364bc1effb86109d9c2babc8ab26dce90329779d8cd0d73=
7e9825a25586aa3c8fa5317e3e433ff235b82f629de0504e3c992f8e8de299f62751bc1fcb2=
e75e0262c7a27be7068cea69b14f303e97c24b99ed29cae142564e285657704b4c411d0d4f8=
c58819e2c0e0ffc3667eb5a408aad8a3023a5f00875e7deab95dc365d8757f7b79815a4fd9e=
6de2b3</pre>

=3D=3DAcknowledgement=3D=3D

Special thanks to Pavol Rusnak, Dmitry Petukhov, Christopher Allen,
Craig Raw, Robert Spigler, Gregory Sanders, Ta Tat Tai, Michael
Flaxman, Pieter Wuille and others for their feedback on the
specification.

=3D=3DReferences=3D=3D

Original mailing list thread:
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2021-February/01838=
5.html

--0000000000008f208d05bf344999
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">Hi all,<br><br>Please find below the comp=
lete draft of the Bitcoin Secure Multisig Setup (BSMS) BIP. The spec has go=
ne through a number of important updates in the last month or so. Thanks ev=
eryone who has participated in the review process.<br><br>As a PR: <a href=
=3D"https://github.com/bitcoin/bips/pull/1097">https://github.com/bitcoin/b=
ips/pull/1097</a><br><br>A few notes:<br>*=C2=A0PBKDF2-SHA512 was chosen in=
stead of=C2=A0PBKDF2-SHA256 for the key derivation function, due to widespr=
ead existing hardware support for=C2=A0PBKDF2-SHA512=C2=A0<br>* Only one de=
scriptor is stored in the multisig configuration - this simplifies wallet s=
etup and recovery<br>(For the full review and relevant discussions, please =
check out=C2=A0<a href=3D"https://github.com/nunchuk-io/bips/pull/1">https:=
//github.com/nunchuk-io/bips/pull/1</a>).<br><br>Best,<br>Hugo<br><br><pre =
style=3D"color:rgb(0,0,0);white-space:pre-wrap">&lt;pre&gt;
  BIP: To be determined
  Layer: Applications
  Title: Bitcoin Secure Multisig Setup (BSMS)
  Author: Hugo Nguyen &lt;hugo at <a href=3D"http://nunchuk.io">nunchuk.io<=
/a>&gt;, Peter Gray &lt;peter at <a href=3D"http://coinkite.com">coinkite.c=
om</a>&gt;, Marko Bencun &lt;marko at <a href=3D"http://shiftcrypto.ch">shi=
ftcrypto.ch</a>&gt;, Aaron Chen &lt;aarondongchen at <a href=3D"http://gmai=
l.com">gmail.com</a>&gt;, Rodolfo Novak &lt;rodolfo at <a href=3D"http://co=
inkite.com">coinkite.com</a>&gt;
  Comments-Summary: No comments yet.
  Comments-URI:
  Status: Proposed
  Type: Standards Track
  Created: 2020-11-10
  License: BSD-2-Clause
&lt;/pre&gt;

=3D=3DIntroduction=3D=3D

=3D=3D=3DAbstract=3D=3D=3D

This document proposes a mechanism to set up multisig wallets securely.

=3D=3D=3DCopyright=3D=3D=3D

This BIP is licensed under the 2-clause BSD license.

=3D=3D=3DMotivation=3D=3D=3D

The Bitcoin multisig experience has been greatly streamlined under [<a href=
=3D"https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki">https:/=
/github.com/bitcoin/bips/blob/master/bip-0174.mediawiki</a> BIP-0174
(Partially Signed Bitcoin Transaction)]. However, what is still missing is =
a standardized process for setting up multisig wallets securely across diff=
erent vendors.

There are a number of concerns when it comes to setting up a multisig walle=
t:

# Whether the multisig configuration, such as Signer membership, script typ=
e, derivation paths and number of signatures required, is correct and not t=
ampered with.
# Whether the keys or the multisig configuration are leaked during the setu=
p.
# Whether the Signer persists the multisig configuration in their respectiv=
e storage, and under what format.
# Whether the Signer&#39;s storage is tamper-proof.
# Whether the Signer subsequently uses the multisig configuration to genera=
te and verify receive and change addresses.

An attacker who can modify the multisig configuration can steal or hold fun=
ds for ransom by duping the user into sending funds to the wrong address. A=
n attacker who cannot modify the configuration but can learn about the keys=
 and/or the configuration can monitor transactions in the wallet, resulting=
 in loss of privacy.

This proposal seeks to address concerns #1, #2 and #3: to mitigate the risk=
 of tampering during the initial setup phase, and to define an interoperabl=
e multisig configuration format.

Concerns #4 and #5 should be handled by Signers and are out of scope of thi=
s proposal.

=3D=3DSpecification=3D=3D

=3D=3D=3DPrerequisites=3D=3D=3D
This proposal assumes the parties in the multisig support [<a href=3D"https=
://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki">https://github.c=
om/bitcoin/bips/blob/master/bip-0032.mediawiki</a> BIP-0032], [<a href=3D"h=
ttps://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki">https://gith=
ub.com/bitcoin/bips/blob/master/bip-0322.mediawiki</a> BIP-0322], [<a href=
=3D"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md">http=
s://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md</a> the descr=
iptor language] and [<a href=3D"https://tools.ietf.org/html/rfc3686">https:=
//tools.ietf.org/html/rfc3686</a> AES encryption].

=3D=3D=3DFile Extension=3D=3D=3D
All descriptor and key records should have a &lt;tt&gt;.bsms&lt;/tt&gt; fil=
e extension. Encrypted data should have a &lt;tt&gt;.dat&lt;/tt&gt; extensi=
on.

=3D=3D=3DRoles=3D=3D=3D
=3D=3D=3D=3DCoordinator=3D=3D=3D=3D

The Coordinator initiates the multisig setup. The Coordinator determines wh=
at type of multisig is used and the exact policy script. If encryption is e=
nabled, the Coordinator also distributes a shared secret or shared secrets =
to the parties involved for secure communication. The Coordinator gathers i=
nformation from the Signers to generate a descriptor record. The Coordinato=
r distributes the descriptor record back to the Signers.

=3D=3D=3D=3DSigner=3D=3D=3D=3D

The Signer is a participating member in the multisig. Its responsibilities =
include providing its key record -- which contains an Extended Public Key (=
XPUB) -- to the Coordinator, verifying that its XPUB is included in the des=
criptor record and persisting the descriptor record in its storage.

=3D=3D=3DSetup Process=3D=3D=3D

=3D=3D=3D=3DRound 1=3D=3D=3D=3D

=3D=3D=3D=3D=3DCoordinator=3D=3D=3D=3D=3D

* The Coordinator creates a new multisig wallet creation session. The Coord=
inator constructs the multisig script and its policy parameters, such as th=
e required number of signatures and the total number of Signers (&lt;tt&gt;=
M&lt;/tt&gt; and &lt;tt&gt;N&lt;/tt&gt;).
* The session should expire after some time period determined by the Coordi=
nator, e.g., 24 hours. The timeout allows the encryption key to have lower =
entropy.
* If encryption is enabled, the Coordinator distributes a secret &lt;tt&gt;=
TOKEN&lt;/tt&gt; to each Signer over a secure channel. The Signer can use t=
he &lt;tt&gt;TOKEN&lt;/tt&gt; to derive an &lt;tt&gt;ENCRYPTION_KEY&lt;/tt&=
gt;. Refer to the Encryption section below for details on the &lt;tt&gt;TOK=
EN&lt;/tt&gt;, the key derivation function and the encryption scheme. Depen=
ding on the use case, the Coordinator can decide whether to share one commo=
n &lt;tt&gt;TOKEN&lt;/tt&gt; for all Signers, or to have one per Signer.
* If encryption is disabled, the &lt;tt&gt;TOKEN&lt;/tt&gt; is set to &lt;t=
t&gt;0&lt;/tt&gt;, and all the encryption/decryption steps below can be ski=
pped.

=3D=3D=3D=3D=3DSigner=3D=3D=3D=3D=3D

* The Signer initiates the multisig wallet creation session by setting the =
&lt;tt&gt;TOKEN&lt;/tt&gt;. The Signer derives an &lt;tt&gt;ENCRYPTION_KEY&=
lt;/tt&gt; from the &lt;tt&gt;TOKEN&lt;/tt&gt;. The Signer can keep the ses=
sion open until a different value for the &lt;tt&gt;TOKEN&lt;/tt&gt; is set=
.
* The Signer generates a key record by prompting the user for a multisig de=
rivation path and retrieves the XPUB at that derivation path. Alternatively=
, the Signer can choose a path on behalf of the user. If the Signer chooses=
 the path, it should try to avoid reusing XPUBs for different wallets.
* The first line in the record must be the specification version (&lt;tt&gt=
;BSMS 1.0&lt;/tt&gt; as of this writing). The second line must be the hex-e=
ncoded &lt;tt&gt;TOKEN&lt;/tt&gt;. The third line must be the &lt;tt&gt;KEY=
&lt;/tt&gt;. The &lt;tt&gt;KEY&lt;/tt&gt; is an XPUB plus its key origin in=
formation, written in the descriptor-defined format, i.e.: &lt;tt&gt;[{mast=
er key fingerprint}/{derivation path}]{XPUB}&lt;/tt&gt;. The fourth line is=
 a text description of the key, 80 characters maximum. The fifth line must =
be a &lt;tt&gt;SIG&lt;/tt&gt;, whereas &lt;tt&gt;SIG&lt;/tt&gt; is the sign=
ature generated by using the private key associated with the XPUB to sign t=
he first four lines. The signature should follow [<a href=3D"https://github=
.com/bitcoin/bips/blob/master/bip-0322.mediawiki">https://github.com/bitcoi=
n/bips/blob/master/bip-0322.mediawiki</a> BIP-0322], legacy format accepted=
.
* The Signer calculates the Message Authentication Code (&lt;tt&gt;MAC&lt;/=
tt&gt;) for the record. The first 16 bytes of the &lt;tt&gt;MAC&lt;/tt&gt; =
serves as the Initialization Vector (&lt;tt&gt;IV&lt;/tt&gt;) for the encry=
ption.
* The Signer encrypts the key record with the &lt;tt&gt;ENCRYPTION_KEY&lt;/=
tt&gt; and &lt;tt&gt;IV&lt;/tt&gt;.
* The Signer encodes the &lt;tt&gt;MAC&lt;/tt&gt; and the ciphertext into h=
exadecimal format, then concatenates the results: &lt;tt&gt;(MAC || ciphert=
ext)&lt;/tt&gt;.

=3D=3D=3D=3DRound 2=3D=3D=3D=3D

=3D=3D=3D=3D=3DCoordinator=3D=3D=3D=3D=3D

* The Coordinator gathers key records from all participating Signers. The C=
oordinator verifies that there are exactly &lt;tt&gt;N&lt;/tt&gt; unique ke=
y records before the wallet setup session expires.
* For each key record, the Coordinator extracts the &lt;tt&gt;MAC&lt;/tt&gt=
; from the data, sets &lt;tt&gt;IV&lt;/tt&gt; to the first 16 bytes of the =
&lt;tt&gt;MAC&lt;/tt&gt;, then decrypts the ciphertext using the &lt;tt&gt;=
ENCRYPTION_KEY&lt;/tt&gt; and &lt;tt&gt;IV&lt;/tt&gt;.
* The Coordinator verifies that the included &lt;tt&gt;MAC&lt;/tt&gt; is va=
lid given the plaintext.
* The Coordinator verifies that the key records have compatible specificati=
on versions.
* The Coordinator verifies that the included &lt;tt&gt;SIG&lt;/tt&gt; is va=
lid given the &lt;tt&gt;KEY&lt;/tt&gt;.
* If all key records look good, the Coordinator fills in all necessary info=
rmation to generate a descriptor record.
* The first line in the descriptor record must be the specification version=
 (&lt;tt&gt;BSMS 1.0&lt;/tt&gt; as of this writing). The second line must b=
e a comma-separated list of accepted derivation paths that the Signers can =
use to generate addresses from the included XPUBs. The paths must start wit=
h &lt;tt&gt;/&lt;/tt&gt; and use non-hardened derivation. For example, &lt;=
tt&gt;/0/*&lt;/tt&gt; and &lt;tt&gt;/1/*&lt;/tt&gt; are some common paths. =
If there are no restrictions, it must say &lt;tt&gt;No path restrictions&lt=
;/tt&gt;. The third line must be the descriptor string plus a &lt;tt&gt;CHE=
CKSUM&lt;/tt&gt;, all in one line. The &lt;tt&gt;CHECKSUM&lt;/tt&gt; has [<=
a href=3D"https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md=
#checksums">https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.=
md#checksums</a> BECH32 encoding].
* The Coordinator calculates the &lt;tt&gt;MAC&lt;/tt&gt; for the record. T=
he first 16 bytes of the &lt;tt&gt;MAC&lt;/tt&gt; serves as the &lt;tt&gt;I=
V&lt;/tt&gt; for the encryption..=20
* The Coordinator encrypts the descriptor record with the &lt;tt&gt;ENCRYPT=
ION_KEY&lt;/tt&gt; and &lt;tt&gt;IV&lt;/tt&gt;.
* The Coordinator encodes the &lt;tt&gt;MAC&lt;/tt&gt; and the ciphertext i=
nto hexadecimal format, then concatenates the results: &lt;tt&gt;(MAC || ci=
phertext)&lt;/tt&gt;.
* The Coordinator sends the encrypted descriptor record to all participatin=
g Signers.

=3D=3D=3D=3D=3DSigner=3D=3D=3D=3D=3D

* The Signer imports the descriptor record.
* The Signer extracts the &lt;tt&gt;MAC&lt;/tt&gt; from the data, sets &lt;=
tt&gt;IV&lt;/tt&gt; to the first 16 bytes of the &lt;tt&gt;MAC&lt;/tt&gt;, =
then decrypts the ciphertext using the &lt;tt&gt;ENCRYPTION_KEY&lt;/tt&gt; =
(derived from the open session) and &lt;tt&gt;IV&lt;/tt&gt;.
* The Signer verifies that the included &lt;tt&gt;MAC&lt;/tt&gt; is valid g=
iven the plaintext.
* The Signer verifies that it can support the included specification versio=
n.
* The Signer verifies that it is compatible with the derivation path restri=
ctions.
* The Signer verifies the descriptor=E2=80=99s &lt;tt&gt;CHECKSUM&lt;/tt&gt=
;.
* The Signer verifies that it can support the descriptor.
* The Signer checks that its &lt;tt&gt;KEY&lt;/tt&gt; is included in the de=
scriptor, using path and fingerprint information provided. The check must p=
erform an exact match on the &lt;tt&gt;KEY&lt;/tt&gt;s and not using shortc=
uts such as matching fingerprints, which is trivial to spoof.
* For confirmation, the Signer must display to the user the &lt;tt&gt;CHECK=
SUM&lt;/tt&gt;, the derivation path restrictions and the policy parameters,=
 such as &lt;tt&gt;M&lt;/tt&gt;, &lt;tt&gt;N&lt;/tt&gt; and the position(s)=
 of its own XPUB in the policy script. The total number of Signers, &lt;tt&=
gt;N&lt;/tt&gt;, is important to prevent a &lt;tt&gt;KEY&lt;/tt&gt; inserti=
on attack. The position is important for scripts where key order matters. W=
hen applicable, all positions of the XPUB must be displayed. The full descr=
iptor must also be available for review upon user request.=20
* When possible, the Signer should also show a preview of the first address=
(es) of the wallet.
* Parties must check with each other that all Signers have verified the des=
criptor and has the same confirmation (except for the key positions).
* If all checks pass, the Signer must persist the descriptor record in its =
storage.

This completes the setup.

=3D=3D=3DEncryption=3D=3D=3D

=3D=3D=3D=3DThe Token=3D=3D=3D=3D
We define three modes of encryption.

# &lt;tt&gt;NO_ENCRYPTION&lt;/tt&gt; : the &lt;tt&gt;TOKEN&lt;/tt&gt; is se=
t to &lt;tt&gt;0&lt;/tt&gt;. Encryption is disabled.
# &lt;tt&gt;STANDARD&lt;/tt&gt; : the &lt;tt&gt;TOKEN&lt;/tt&gt; is a 64-bi=
t nonce.
# &lt;tt&gt;EXTENDED&lt;/tt&gt; : the &lt;tt&gt;TOKEN&lt;/tt&gt; is a 96-bi=
t nonce.

The &lt;tt&gt;TOKEN&lt;/tt&gt; can be converted to one of these formats:
* A decimal number (recommended). The number must not exceed the maximum va=
lue of the nonce.=20
* A mnemonic phrase using [<a href=3D"https://github.com/bitcoin/bips/blob/=
master/bip-0039.mediawiki">https://github.com/bitcoin/bips/blob/master/bip-=
0039.mediawiki</a> BIP-0039] word list (6 words in &lt;tt&gt;STANDARD&lt;/t=
t&gt; mode; 9 words in &lt;tt&gt;EXTENDED&lt;/tt&gt; mode).
* A QR code.
* Other formats.

The flexibility in the data format allows each Signer to customize the User=
 Experience based on its respective capabilities.

=3D=3D=3D=3DKey Derivation=3D=3D=3D=3D
The key derivation function is [<a href=3D"https://tools.ietf.org/html/rfc2=
898">https://tools.ietf.org/html/rfc2898</a> PBKDF2], with PRF =3D SHA512. =
Specifically:

&lt;tt&gt;DKey =3D PBKDF2(PRF, Password, Salt, c, dkLen)&lt;/tt&gt;

Whereas:

* PRF =3D SHA512
* Password =3D &quot;No SPOF&quot;
* Salt =3D &lt;tt&gt;TOKEN&lt;/tt&gt;
* c =3D 2048
* dkLen =3D 256
* DKey =3D Derived &lt;tt&gt;ENCRYPTION_KEY&lt;/tt&gt;

=3D=3D=3D=3DEncryption Scheme=3D=3D=3D=3D
The encryption scheme is [<a href=3D"https://tools.ietf.org/html/rfc3686">h=
ttps://tools.ietf.org/html/rfc3686</a> AES-256-CTR].

&lt;tt&gt;MAC =3D HMAC-SHA256(HMAC_Key, hex-encoded TOKEN || Data)&lt;/tt&g=
t;

&lt;tt&gt;IV =3D First 16 bytes of MAC&lt;/tt&gt;

&lt;tt&gt;Ciphertext =3D AES-256-CTR-Encrypt(Plaintext, DKey, IV)&lt;/tt&gt=
;

&lt;tt&gt;Plaintext =3D AES-256-CTR-Decrypt(Ciphertext, DKey, IV)&lt;/tt&gt=
;

Whereas:
* DKey =3D &lt;tt&gt;ENCRYPTION_KEY&lt;/tt&gt;
* HMAC_Key =3D SHA256(&lt;tt&gt;ENCRYPTION_KEY&lt;/tt&gt;)
* Data =3D the plaintext, e.g. the entire key record in round 1 and the ent=
ire descriptor record in round 2

The &lt;tt&gt;MAC&lt;/tt&gt; is to be sent along with the key and descripto=
r record, as specified above. Because it is a &lt;tt&gt;MAC&lt;/tt&gt; over=
 the entire plaintext, this is essentially an [<a href=3D"https://en.wikipe=
dia.org/wiki/Authenticated_encryption#Encrypt-and-MAC_(E&amp;M)">https://en=
.wikipedia.org/wiki/Authenticated_encryption#Encrypt-and-MAC_(E&amp;M)</a> =
Encrypt-and-MAC] form of authenticated encryption.

=3D=3DQR Codes=3D=3D
For signers that use QR codes to transmit data, key and descriptor records =
can be converted to QR codes, following [<a href=3D"https://github.com/Bloc=
kchainCommons/Research/blob/master/papers/bcr-2020-005-ur.md">https://githu=
b.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-005-ur.md</a> =
the BCR standard].

Also refer to [<a href=3D"https://github.com/BlockchainCommons/Research/blo=
b/master/papers/bcr-2020-015-account.md">https://github.com/BlockchainCommo=
ns/Research/blob/master/papers/bcr-2020-015-account.md</a> UR Type Definiti=
on for BIP44 Accounts] and [<a href=3D"https://github.com/BlockchainCommons=
/Research/blob/master/papers/bcr-2020-010-output-desc.md">https://github.co=
m/BlockchainCommons/Research/blob/master/papers/bcr-2020-010-output-desc.md=
</a> UR Type Definition for Bitcoin Output Descriptors] for more details.

=3D=3DSecurity=3D=3D

This proposal introduces two layers of protection. The first one is a tempo=
rary, secret &lt;tt&gt;TOKEN&lt;/tt&gt;. The second one is the descriptor &=
lt;tt&gt;CHECKSUM&lt;/tt&gt;.

The &lt;tt&gt;TOKEN&lt;/tt&gt; is used to encrypt the two rounds of communi=
cation between the Signer and the Coordinator. A &lt;tt&gt;MAC&lt;/tt&gt; i=
s also generated from the &lt;tt&gt;TOKEN&lt;/tt&gt; and plaintext to authe=
nticate the data being exchanged. The &lt;tt&gt;TOKEN&lt;/tt&gt; is only ne=
eded during the setup phase, and can be safely discarded afterwards.

The descriptor &lt;tt&gt;CHECKSUM&lt;/tt&gt;, on the other hand, can be use=
d to verify the integrity of the multisig configuration. An attacker who ta=
mpers with the multisig configuration must also change the descriptor &lt;t=
t&gt;CHECKSUM&lt;/tt&gt;. Parties must check with each other that all Signe=
rs have the same &lt;tt&gt;CHECKSUM&lt;/tt&gt;, along with the policy param=
eters, to reduce the chance of tampering. The &lt;tt&gt;CHECKSUM&lt;/tt&gt;=
 must be persisted along with the descriptor in each Signer=E2=80=99s stora=
ge.

The &lt;tt&gt;TOKEN&lt;/tt&gt; and the &lt;tt&gt;CHECKSUM&lt;/tt&gt; can=E2=
=80=99t guarantee complete protection, since that depends on the overall se=
curity of all parties in the setup, but they can make it significantly hard=
er for an attacker to tamper with the multisig configuration.

=3D=3DPrivacy=3D=3D
Encryption helps improve the privacy of the wallet by avoiding sharing XPUB=
s and descriptors in plaintext.

If the parties wish to have stronger privacy, it is recommended to use a hi=
gher number of bits for the &lt;tt&gt;TOKEN&lt;/tt&gt;, and to completely e=
rase knowledge of the &lt;tt&gt;TOKEN&lt;/tt&gt; after the multisig wallet =
has been set up.

=3D=3DTest Vectors=3D=3D

=3D=3D=3DMode: &lt;tt&gt;NO_ENCRYPTION&lt;/tt&gt;=3D=3D=3D
=3D=3D=3D=3DROUND 1=3D=3D=3D=3D
* Coordinator
** M-of-N: 2/2
** ADDRESS_TYPE: NATIVE_SEGWIT
** TOKEN: 0

* Signer 1
** MASTER_KEY_FINGERPRINT: 539f3d89
** PRIVATE_KEY (m/48&#39;/0&#39;/0&#39;/2&#39;): KyoXqiwiz6qm21BSYebiZFfNF7=
obkhiJW6TdPMZTQQMF4kZtfD78
** XPUB (m/48&#39;/0&#39;/0&#39;/2&#39;): xpub6ETerig7tq89mtaD8Gau2xRWxouRM=
By6XHqciA8GZzC2dJv3w6FxfgoegH4b2qYF4oG6VBrhpLrauPs5E1q58GLCnhKp6g9QsV9ZA7J5=
JNa
** Legacy signature
** &lt;tt&gt;signer_1_key.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
00
[539f3d89/48&#39;/0&#39;/0&#39;/2&#39;]xpub6ETerig7tq89mtaD8Gau2xRWxouRMBy6=
XHqciA8GZzC2dJv3w6FxfgoegH4b2qYF4oG6VBrhpLrauPs5E1q58GLCnhKp6g9QsV9ZA7J5JNa
Signer 1 key
IPXsnNSZb8M6H4fAWtpjAc75hyHHd89fskpM5o7qFg+mPDzEPc1k2mjuIpVIIzaCe45FwPfAAa9=
1RaStfC5Sak0=3D&lt;/pre&gt;

* Signer 2
** MASTER_KEY_FINGERPRINT: f8b12aa6
** PRIVATE_KEY (m/48&#39;/0&#39;/0&#39;/2&#39;): L1zht7muKnUYFMdzC3jwXd78u8=
tGoKr46AXGh4waF9nphUYWq7ow
** XPUB (m/48&#39;/0&#39;/0&#39;/2&#39;): xpub6EWPNhGSX86SN4J2DrBUaQ826o6V4=
egHqAJZUDJqnsthv9CcjBZV79u68M3YZkuTJnJBXfCrHuJy97fkVurntwgt3V7Ms5hXpJV2vS8f=
QZM
** Legacy signature
** &lt;tt&gt;signer_2_key.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
00
[f8b12aa6/48&#39;/0&#39;/0&#39;/2&#39;]xpub6EWPNhGSX86SN4J2DrBUaQ826o6V4egH=
qAJZUDJqnsthv9CcjBZV79u68M3YZkuTJnJBXfCrHuJy97fkVurntwgt3V7Ms5hXpJV2vS8fQZM
Signer 2 key
H38+lp9iaesBeCN05BDTH/SnmarlH6+X+Kmw1pgCk+c1Pc1evYIdBag9Nc0nsKhvPtfEbRt9r/q=
sUVZ5onCtBTc=3D&lt;/pre&gt;

=3D=3D=3D=3DROUND 2=3D=3D=3D=3D
* Coordinator
** &lt;tt&gt;my_multisig_wallet.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
/0/*,/1/*
wsh(sortedmulti(2,[539f3d89/48&#39;/0&#39;/0&#39;/2&#39;]xpub6ETerig7tq89mt=
aD8Gau2xRWxouRMBy6XHqciA8GZzC2dJv3w6FxfgoegH4b2qYF4oG6VBrhpLrauPs5E1q58GLCn=
hKp6g9QsV9ZA7J5JNa/*,[f8b12aa6/48&#39;/0&#39;/0&#39;/2&#39;]xpub6EWPNhGSX86=
SN4J2DrBUaQ826o6V4egHqAJZUDJqnsthv9CcjBZV79u68M3YZkuTJnJBXfCrHuJy97fkVurntw=
gt3V7Ms5hXpJV2vS8fQZM/*))#fntxdj7p&lt;/pre&gt;

=3D=3D=3DMode: &lt;tt&gt;STANDARD&lt;/tt&gt; Encryption=3D=3D=3D
=3D=3D=3D=3DROUND 1=3D=3D=3D=3D
* Coordinator
** M-of-N: 2/2
** ADDRESS_TYPE: NATIVE_SEGWIT
** TOKEN (hex): 1ed4ba49e96336b8
*** TOKEN (decimal): 2221605342811469496
*** TOKEN (mnemonic): burst place mystery spot cricket foster
** ENCRYPTION_KEY (hex): 72185a0e25b4efc5d6ac0f8ed32b0165199100e32385040e3a=
48eb30164bf492

* Signer 1
** MASTER_KEY_FINGERPRINT: 98d79e95
** PRIVATE_KEY (m/48&#39;/0&#39;/0&#39;/2&#39;): KydC7hZFtWe56oQUAw14HvQ3gK=
eKVd3m8frFgVMxUqpuhKHvcmm3
** XPUB (m/48&#39;/0&#39;/0&#39;/2&#39;): xpub6DvvwHS5pd1D36xt4YBGJvtdThWXf=
n8L9qRj9DbFMExMeP6eBE6Aw9WyBC7XUQwiPPDFurirewsKZpYv68yTV5RBy7SZmw45QEkaLka5=
BCt
** Legacy signature
** &lt;tt&gt;signer_1_key.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
1ed4ba49e96336b8
[98d79e95/48&#39;/0&#39;/0&#39;/2&#39;]xpub6DvvwHS5pd1D36xt4YBGJvtdThWXfn8L=
9qRj9DbFMExMeP6eBE6Aw9WyBC7XUQwiPPDFurirewsKZpYv68yTV5RBy7SZmw45QEkaLka5BCt
Signer 1 key
HxtPoP0DrQSac/7ypcwC07R2s6jjpXR6Li2Q92zXj/FSIMQcV5yOU0/ONsDgHXamq0gD5DfPbvu=
VCp9ZJubclV4=3D&lt;/pre&gt;

* Signer 1 encryption
** HMAC_KEY (hex): 4dab3988cbc683ad7a8c93d43f9b11a78b63a93d5e33ea19c603f4b7=
b87ac284
** MAC (hex): afe99e92f0eadc3308eb990045e90a4f54e9f59d22aae5034ac3d866d29c5=
08d
** IV (hex) : afe99e92f0eadc3308eb990045e90a4f
** CIPHERTEXT (hex): 214ec9a861a238ba7f0412305a97a6e0faa332be15af09127e131d=
669e5d55d73891580a5808cea5d2bf39f43496d3c0f8236eff3854fcc7446daf9d2b58fd40d=
97ce3b1745de2959e29767039b99969821400eca0c3517fae56d2d24d5235a3430af1ed894b=
68681d706cce7c75adf35d8580603aa302bc01fef06d0336a37f19dd46100baa9e4eabd8796=
a810e13941ad0980c126ad55d6a4bbef11a7bf893b7d2ed8fb0d8324c4c9b512d4d1e75096c=
63511e15018fc832816b5639d58fc28c60c049487d04bd5a6cb32aa1381d0809660d54376b9=
f63325c18cfd1ac5024088e74cb703fe165972cc4485abb1feefe92a0b4ea297fe2f4f7416e=
eee1efc9b942540931ef
** &lt;tt&gt;signer_1_key.dat&lt;/tt&gt;: &lt;pre&gt;afe99e92f0eadc3308eb99=
0045e90a4f54e9f59d22aae5034ac3d866d29c508d214ec9a861a238ba7f0412305a97a6e0f=
aa332be15af09127e131d669e5d55d73891580a5808cea5d2bf39f43496d3c0f8236eff3854=
fcc7446daf9d2b58fd40d97ce3b1745de2959e29767039b99969821400eca0c3517fae56d2d=
24d5235a3430af1ed894b68681d706cce7c75adf35d8580603aa302bc01fef06d0336a37f19=
dd46100baa9e4eabd8796a810e13941ad0980c126ad55d6a4bbef11a7bf893b7d2ed8fb0d83=
24c4c9b512d4d1e75096c63511e15018fc832816b5639d58fc28c60c049487d04bd5a6cb32a=
a1381d0809660d54376b9f63325c18cfd1ac5024088e74cb703fe165972cc4485abb1feefe9=
2a0b4ea297fe2f4f7416eeee1efc9b942540931ef&lt;/pre&gt;

* Signer 2
** MASTER_KEY_FINGERPRINT: 3e94b5a1
** PRIVATE_KEY (m/48&#39;/0&#39;/0&#39;/2&#39;): KyPh5XYjExjNHPiBjYhp8iAntA=
ehrDziiwRv7y9Ln6eK9QU2xP55
** XPUB (m/48&#39;/0&#39;/0&#39;/2&#39;): xpub6E1W1DUYY29V2b8czCcpi36GG2uD3=
3B11vwNopgTZwsVyfgAkA4kPCqLP5R4YzaRvzW17CQrDkgmDQbA848AdkR7W18nNvMKXzzCBSnZ=
P9c
** Legacy signature
** &lt;tt&gt;signer_2_key.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
1ed4ba49e96336b8
[3e94b5a1/48&#39;/0&#39;/0&#39;/2&#39;]xpub6E1W1DUYY29V2b8czCcpi36GG2uD33B1=
1vwNopgTZwsVyfgAkA4kPCqLP5R4YzaRvzW17CQrDkgmDQbA848AdkR7W18nNvMKXzzCBSnZP9c
Signer 2 key
ILR49QLy9+xkMS11TIXJRSMgOQOzGbAaooq4/ZRcd8VgM6j5upJMI0mjJHseQOMYSGk8FqjXZbM=
vBGyiX9wdutM=3D&lt;/pre&gt;

* Signer 2 encryption
** HMAC_KEY (hex): 4dab3988cbc683ad7a8c93d43f9b11a78b63a93d5e33ea19c603f4b7=
b87ac284
** MAC (hex): 5c7cb2ac407cd60b1f2b86ef46077d3a312b6ce921df2a141347e8bf1e5c6=
573
** IV (hex) : 5c7cb2ac407cd60b1f2b86ef46077d3a
** CIPHERTEXT (hex): f23e6c76ff45d308dea6014030a274127ad437228f1d5ec2431d2e=
a9e3cedd5b0a207a9efa6f926d5420205003f3cb9c4b82b2d595180e62a173a2e5aa0322de4=
8a70a873f641bdae1764e6b1667c241e0fe03a4ccdc3fe0cfa5f75b239d6497c3b69dca17bb=
685ba70b307d1243836d8fb198ce727cfae4057ee0b4fdcb09f4ba5ae127f49c5de780edb4e=
40aec96303c8a7b98b1b8e53dd5e07e01d4f3ffd836763209a1f0cbc61adcfdc2951e77528e=
e7b6e68114c3a4bec38875d285021e68ae8aa913bb1e2e65dd52c649a0e98bfb4e8bab6dd10=
295c1167a0854ba44f094feb75d2fb00c944f07d4b47114f483df9838459316f3ddbc4a82e6=
507881931f8e20f5b805
** &lt;tt&gt;signer_2_key.dat&lt;/tt&gt;: &lt;pre&gt;5c7cb2ac407cd60b1f2b86=
ef46077d3a312b6ce921df2a141347e8bf1e5c6573f23e6c76ff45d308dea6014030a274127=
ad437228f1d5ec2431d2ea9e3cedd5b0a207a9efa6f926d5420205003f3cb9c4b82b2d59518=
0e62a173a2e5aa0322de48a70a873f641bdae1764e6b1667c241e0fe03a4ccdc3fe0cfa5f75=
b239d6497c3b69dca17bb685ba70b307d1243836d8fb198ce727cfae4057ee0b4fdcb09f4ba=
5ae127f49c5de780edb4e40aec96303c8a7b98b1b8e53dd5e07e01d4f3ffd836763209a1f0c=
bc61adcfdc2951e77528ee7b6e68114c3a4bec38875d285021e68ae8aa913bb1e2e65dd52c6=
49a0e98bfb4e8bab6dd10295c1167a0854ba44f094feb75d2fb00c944f07d4b47114f483df9=
838459316f3ddbc4a82e6507881931f8e20f5b805&lt;/pre&gt;

=3D=3D=3D=3DROUND 2=3D=3D=3D=3D
*Coordinator
** &lt;tt&gt;my_multisig_wallet.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
/0/*,/1/*
wsh(sortedmulti(2,[98d79e95/48&#39;/0&#39;/0&#39;/2&#39;]xpub6DvvwHS5pd1D36=
xt4YBGJvtdThWXfn8L9qRj9DbFMExMeP6eBE6Aw9WyBC7XUQwiPPDFurirewsKZpYv68yTV5RBy=
7SZmw45QEkaLka5BCt/*,[3e94b5a1/48&#39;/0&#39;/0&#39;/2&#39;]xpub6E1W1DUYY29=
V2b8czCcpi36GG2uD33B11vwNopgTZwsVyfgAkA4kPCqLP5R4YzaRvzW17CQrDkgmDQbA848Adk=
R7W18nNvMKXzzCBSnZP9c/*))#x0lx92qk&lt;/pre&gt;

*Coordinator encryption
** HMAC_KEY (hex): 4dab3988cbc683ad7a8c93d43f9b11a78b63a93d5e33ea19c603f4b7=
b87ac284
** MAC (hex): df3d06db6c8b8a5f25de202e10ea225df6415d1ed0e36c64cc2be1b7e86c2=
a38
** IV (hex) : df3d06db6c8b8a5f25de202e10ea225d
** CIPHERTEXT (hex): 2761e6bfe839586b4c90954200bc4ce6d39ef164c5d14997755575=
d1691ee249ffd20beda526f57a7424907f839c6c2e3ecd46889ede290a2c81de22d3f33a7fa=
5e55ec95c0e26005c596d0f6346f819823f361f9f9f54d1eae48b325240d66c5888bd5ebab8=
43061dcdd73b675346da982646c83026694d757661d31c2d654fb263c9ab3e874a258bc234c=
48532f15e9450c982fcf161404746e9f23d25e17b74139cd799983fd0c7a7a0386a823d3789=
b4578879a764172cc8ef96ab003eee24f6288007d31e2b999aff5a6d30cc524a0111a99730a=
29cf28ae41dbff6ce21ca6bc1df37074228178048e835584e6e70dba941154d024cd03cb6c5=
6d0bde441ce464aa749de5e814dd30e21b75f62e831ac1f28eda1a7ba7e122076789e284402=
c8ba85b5a0e864bce220e3c78fa2f465e2bcf6b1d378816319de99f99ce7068
** &lt;tt&gt;my_multisig_wallet.dat&lt;/tt&gt;: &lt;pre&gt;df3d06db6c8b8a5f=
25de202e10ea225df6415d1ed0e36c64cc2be1b7e86c2a382761e6bfe839586b4c90954200b=
c4ce6d39ef164c5d14997755575d1691ee249ffd20beda526f57a7424907f839c6c2e3ecd46=
889ede290a2c81de22d3f33a7fa5e55ec95c0e26005c596d0f6346f819823f361f9f9f54d1e=
ae48b325240d66c5888bd5ebab843061dcdd73b675346da982646c83026694d757661d31c2d=
654fb263c9ab3e874a258bc234c48532f15e9450c982fcf161404746e9f23d25e17b74139cd=
799983fd0c7a7a0386a823d3789b4578879a764172cc8ef96ab003eee24f6288007d31e2b99=
9aff5a6d30cc524a0111a99730a29cf28ae41dbff6ce21ca6bc1df37074228178048e835584=
e6e70dba941154d024cd03cb6c56d0bde441ce464aa749de5e814dd30e21b75f62e831ac1f2=
8eda1a7ba7e122076789e284402c8ba85b5a0e864bce220e3c78fa2f465e2bcf6b1d3788163=
19de99f99ce7068&lt;/pre&gt;

=3D=3D=3DMode: &lt;tt&gt;EXTENDED&lt;/tt&gt; Encryption=3D=3D=3D
=3D=3D=3D=3DROUND 1=3D=3D=3D=3D
*Coordinator
** M-of-N: 2/3
** ADDRESS_TYPE: NESTED_SEGWIT
** TOKEN for Signer 1 (hex): 654d63309464afcda558c6aa
*** TOKEN (decimal): 31351541690484562733651510954
*** TOKEN (mnemonic): grab help slow churn enough traffic nice boat price
*** ENCRYPTION_KEY (hex): 4073adac2351e164b8d68039abd9d4b8e4d07adccfdf73ece=
6e236d60b107802
** TOKEN for Signer 2 (hex): b0344f51d5cb04083d598fa3
*** TOKEN (decimal): 54532600447720520868878192547
*** TOKEN (mnemonic): rabbit pen stamp process raccoon advice voice cradle =
person
*** ENCRYPTION_KEY (hex): 6bae6b670e257d7468c3e90194029dd468a2f39d8b9a3ff18=
7b08209b1d409b6
** TOKEN for Signer 3 (hex): 163fd307195982c4c39d50bb
*** TOKEN (decimal): 6885829092987042066541138107
*** TOKEN (mnemonic): bike write scrub crawl oblige give attack present roo=
kie
*** ENCRYPTION_KEY (hex): c78b94589214b6dc98b337ba4ce54380553ed00a1e5b1955f=
c540ce3b30d6566

* Signer 1
** MASTER_KEY_FINGERPRINT: 110dc257
** PRIVATE_KEY (m/48&#39;/0&#39;/0&#39;/1&#39;): KzshDDEBhzyiwXHoyE7ZiLegzz=
tEy54AG6Wq8N844LqHSQMHt4Ji
** XPUB (m/48&#39;/0&#39;/0&#39;/1&#39;): xpub6EPQbDFezXYvVFHqnc8R7QUSE8hTe=
pbyCXU7jJBT4dVm2rQHe1i6isqoj59qhyBiCdKquo6QsgMZNHvEz3BM4cNSszF25siTqLUCznBm=
8vk
** Legacy signature
** &lt;tt&gt;signer_1_key.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
654d63309464afcda558c6aa
[110dc257/48&#39;/0&#39;/0&#39;/1&#39;]xpub6EPQbDFezXYvVFHqnc8R7QUSE8hTepby=
CXU7jJBT4dVm2rQHe1i6isqoj59qhyBiCdKquo6QsgMZNHvEz3BM4cNSszF25siTqLUCznBm8vk
Signer 1 key
IDX6xLdM4XjetYPvVfpVBXAfT7oE3tHAOB4blZpbIst8bjJ+LbDeP4tZl4O8utAuys9igXE0G3k=
aHz1mg/+OU8w=3D&lt;/pre&gt;

* Signer 1 encryption
** HMAC_KEY (hex): f43c359a4b3d7b2e01be73c54519b12545ca9a23a86f824aadf577b3=
14a7caa7
** MAC (hex): 40b6b43e2f1bc01b748eb242235d7e09fa8a2fd6cebe35784cf3adf81910e=
c98
** IV (hex) : 40b6b43e2f1bc01b748eb242235d7e09
** CIPHERTEXT (hex): 0877987764401c27e6c60ed2f1bb89dff1dbc5e8204149f682d530=
49bffe39553f24af3928aa2f78ac2d04ac5baa0c3ec39aaccf0d258e7bb6659a7b92e92f2c2=
784a94f4df8e8af2270d9d411bfff2cfb9f71b4e1ac87561c7d2ac57ca86a1f9716d5da7571=
719d24830fc8d015a0daf04b3742439484488798335357f2eeaa8e2db2ba630f9dffd88236e=
327ab5bfcfb6e29ee3ef6cc18e0b71c1731465c2351e76b92f7b1bd28ef6eff5414c22aa6c8=
0090fa59b973c22e3044e92dbf3688990a49a42828e52c1e686f1193dcdf7b7118930e01419=
fe938c6811c58c84c36d692fd52846f998bc328471f1e73c22261791a08cda096ee3ac8b37f=
31afd0b1d9c335ff9ac67ff230eb0d69f2d7
** &lt;tt&gt;signer_1_key.dat&lt;/tt&gt;: &lt;pre&gt;40b6b43e2f1bc01b748eb2=
42235d7e09fa8a2fd6cebe35784cf3adf81910ec980877987764401c27e6c60ed2f1bb89dff=
1dbc5e8204149f682d53049bffe39553f24af3928aa2f78ac2d04ac5baa0c3ec39aaccf0d25=
8e7bb6659a7b92e92f2c2784a94f4df8e8af2270d9d411bfff2cfb9f71b4e1ac87561c7d2ac=
57ca86a1f9716d5da7571719d24830fc8d015a0daf04b3742439484488798335357f2eeaa8e=
2db2ba630f9dffd88236e327ab5bfcfb6e29ee3ef6cc18e0b71c1731465c2351e76b92f7b1b=
d28ef6eff5414c22aa6c80090fa59b973c22e3044e92dbf3688990a49a42828e52c1e686f11=
93dcdf7b7118930e01419fe938c6811c58c84c36d692fd52846f998bc328471f1e73c222617=
91a08cda096ee3ac8b37f31afd0b1d9c335ff9ac67ff230eb0d69f2d7&lt;/pre&gt;

* Signer 2
** MASTER_KEY_FINGERPRINT: 5c890401
** PRIVATE_KEY (m/48&#39;/0&#39;/0&#39;/1&#39;): L41Jnc9CdBtBJd18429MDGcTgP=
2DNoXaKyyGr271ndTprvrHXDQf
** XPUB (m/48&#39;/0&#39;/0&#39;/1&#39;): xpub6EW1SmjSXq9YwVwcan5qWEncgx89S=
ozMvGNpYF6hfZHYNTikNZ4gsXuVhHTi6xYJCkmY4X4wpPPS5Gr7aY39dVJMS2TGfihr25oaspKt=
U8q
** Legacy signature
** &lt;tt&gt;signer_2_key.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
b0344f51d5cb04083d598fa3
[5c890401/48&#39;/0&#39;/0&#39;/1&#39;]xpub6EW1SmjSXq9YwVwcan5qWEncgx89SozM=
vGNpYF6hfZHYNTikNZ4gsXuVhHTi6xYJCkmY4X4wpPPS5Gr7aY39dVJMS2TGfihr25oaspKtU8q
Signer 2 key
H5kN6UHaK2xACB6iYdTxxQPD8qyFEYv9iMsQs5B0MRfCM7NA5GB+7EFgmBpSctwt6B122zWBr6m=
RjpYjKmj+7hs=3D&lt;/pre&gt;

* Signer 2 encryption
** HMAC_KEY (hex): e0a20b5f5285fbaa35aad08fb70f5626c9abbe1b384a4950735b28ac=
a6325ff2
** MAC (hex): 3a6deec8dbdbd6606a52c7d7e64eca4f972a293cbabac6f62736629fbe779=
28a
** IV (hex) : 3a6deec8dbdbd6606a52c7d7e64eca4f
** CIPHERTEXT (hex): bb0fb72f61b0c4858bd9c65235390b67651b94c4b0329238b0116d=
d6d3365ade33cb1c1b1619638968791a5d2d1d263d90280bdad8d9ca24c34a78e320076e0dc=
cf59e7f729b541b44bbe40ba803dedd3b17c49765377cb2d913a856b86c3dd383dab475790e=
89226ed8ef2301574212d2809ed9c099aa67be434024ee2a4e82a146300acf755863da64807=
cb7bb2636f6616489636d254a870778d3540832aea44abac4328b5d90f3e6045ef36a526ce5=
d575f2305e3e4699dccbc713e9e68f50364036c1054c2a506aab77ea7c43a89536947c24330=
b09a62a90c3b4ae2d452f96ef34ec871af2c52d68ddede2503c87e2ba68d5cf9be589457879=
e06021ea6a6176f7dded820ba4c0e709e2a2
** &lt;tt&gt;signer_2_key.dat&lt;/tt&gt;: &lt;pre&gt;3a6deec8dbdbd6606a52c7=
d7e64eca4f972a293cbabac6f62736629fbe77928abb0fb72f61b0c4858bd9c65235390b676=
51b94c4b0329238b0116dd6d3365ade33cb1c1b1619638968791a5d2d1d263d90280bdad8d9=
ca24c34a78e320076e0dccf59e7f729b541b44bbe40ba803dedd3b17c49765377cb2d913a85=
6b86c3dd383dab475790e89226ed8ef2301574212d2809ed9c099aa67be434024ee2a4e82a1=
46300acf755863da64807cb7bb2636f6616489636d254a870778d3540832aea44abac4328b5=
d90f3e6045ef36a526ce5d575f2305e3e4699dccbc713e9e68f50364036c1054c2a506aab77=
ea7c43a89536947c24330b09a62a90c3b4ae2d452f96ef34ec871af2c52d68ddede2503c87e=
2ba68d5cf9be589457879e06021ea6a6176f7dded820ba4c0e709e2a2&lt;/pre&gt;

* Signer 3
** MASTER_KEY_FINGERPRINT: 614cbf5f
** PRIVATE_KEY (m/48&#39;/0&#39;/0&#39;/1&#39;): L2ccRLzH7GfVxWpU8YSY9y5UGy=
RoqW3UdeNT1vGfVbxAGhwU5qhD
** XPUB (m/48&#39;/0&#39;/0&#39;/1&#39;): xpub6F9TfWTFcMYy5Ycd2ka2az1brJj78=
J2isLAWptZnCpFsesss5sZv5B8xsgt71ZXfhDWhUtf4vng4zY6HUVrQbDMPDYRLYvFFoLnAYfzg=
YPH
** Legacy signature
** &lt;tt&gt;signer_3_key.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
163fd307195982c4c39d50bb
[614cbf5f/48&#39;/0&#39;/0&#39;/1&#39;]xpub6F9TfWTFcMYy5Ycd2ka2az1brJj78J2i=
sLAWptZnCpFsesss5sZv5B8xsgt71ZXfhDWhUtf4vng4zY6HUVrQbDMPDYRLYvFFoLnAYfzgYPH
Signer 3 key
H0jf2JMtke5zDDIWys6fihOCA6QBmC5+hbgVB/c2mMPNPLB6tDXt0TFZU1f9wvaCR9762anKSc8=
CCqXLogw8V00=3D&lt;/pre&gt;

* Signer 3 encryption
** HMAC_KEY (hex): 1f51ea067c121e2f86af5e1d484905046bc63e861573157d8b1ae9e7=
e47e224b
** MAC (hex): 1a5624fcb39cebabb6174456173eec19b756bc916cf2c9d815e9bcce07089=
8c4
** IV (hex) : 1a5624fcb39cebabb6174456173eec19
** CIPHERTEXT (hex): 48d6e139bdc8c19e93cbbf5b4478340c8cf08aa91c28803084d5f5=
8618773f7e615e0134492b496c4e7c130351c0350701f686918033f621378552d7040efedd5=
539d38c258bf936475de775f23da3953fe3ba5bbbd24816b8902b87a9a09700c446b085119d=
edee2395dd69665e742f72f2fb6da4ebe3f4704eaf45486fbfb84d764b718cc0b756e72f72a=
b6069d47765bdd3ebd4074af4fa99a95691a659675ce5f72235c28ddf3c3d53179e598cddc9=
67fc896adc6e97edeeffc85b9e44611df748d923ff3dd921ad4d6e98e0de12359a37558e326=
faf585ba57e73ab45bc4a49f6e8a756f365f5d204e70f7c7bed269e81e9524a41e5d4cbaad0=
b6b442d6eea1e5da1ca345cc665a0cffe2c3
** &lt;tt&gt;signer_3_key.dat&lt;/tt&gt;: &lt;pre&gt;1a5624fcb39cebabb61744=
56173eec19b756bc916cf2c9d815e9bcce070898c448d6e139bdc8c19e93cbbf5b4478340c8=
cf08aa91c28803084d5f58618773f7e615e0134492b496c4e7c130351c0350701f686918033=
f621378552d7040efedd5539d38c258bf936475de775f23da3953fe3ba5bbbd24816b8902b8=
7a9a09700c446b085119dedee2395dd69665e742f72f2fb6da4ebe3f4704eaf45486fbfb84d=
764b718cc0b756e72f72ab6069d47765bdd3ebd4074af4fa99a95691a659675ce5f72235c28=
ddf3c3d53179e598cddc967fc896adc6e97edeeffc85b9e44611df748d923ff3dd921ad4d6e=
98e0de12359a37558e326faf585ba57e73ab45bc4a49f6e8a756f365f5d204e70f7c7bed269=
e81e9524a41e5d4cbaad0b6b442d6eea1e5da1ca345cc665a0cffe2c3&lt;/pre&gt;

=3D=3D=3D=3DROUND 2=3D=3D=3D=3D
* Coordinator
** &lt;tt&gt;my_multisig_wallet.bsms&lt;/tt&gt;:
&lt;pre&gt;BSMS 1.0
/0/*,/1/*
sh(wsh(multi(2,[110dc257/48&#39;/0&#39;/0&#39;/1&#39;]xpub6EPQbDFezXYvVFHqn=
c8R7QUSE8hTepbyCXU7jJBT4dVm2rQHe1i6isqoj59qhyBiCdKquo6QsgMZNHvEz3BM4cNSszF2=
5siTqLUCznBm8vk/*,[5c890401/48&#39;/0&#39;/0&#39;/1&#39;]xpub6EW1SmjSXq9YwV=
wcan5qWEncgx89SozMvGNpYF6hfZHYNTikNZ4gsXuVhHTi6xYJCkmY4X4wpPPS5Gr7aY39dVJMS=
2TGfihr25oaspKtU8q/*,[614cbf5f/48&#39;/0&#39;/0&#39;/1&#39;]xpub6F9TfWTFcMY=
y5Ycd2ka2az1brJj78J2isLAWptZnCpFsesss5sZv5B8xsgt71ZXfhDWhUtf4vng4zY6HUVrQbD=
MPDYRLYvFFoLnAYfzgYPH/*)))#j3ykhz7f&lt;/pre&gt;

* Send to Signer 1:
** HMAC_KEY (hex): f43c359a4b3d7b2e01be73c54519b12545ca9a23a86f824aadf577b3=
14a7caa7
** MAC (hex): ee74a0f50943d7d1b65270028bb05133e87c832cdc1ef0a07c79db2093ca3=
432
** IV (hex) : ee74a0f50943d7d1b65270028bb05133
** CIPHERTEXT (hex): 8e3ba3dac0f979fad0d160bd00c8294ff1726d51b95ff3e1534e5a=
1900f3d7cd4f6d929985a94b9da2c11e4e0f7770cc53c6739fd099477323bd26a3eca9c8016=
e79848d15e274463424b8355cd73cced61f1816ac8bac87f8c650ee9052f50e347c52ad24b0=
0794a9d5523714be2fdcf731f14b7a8d7c93eab44c258e1c417d2837b9676832e8ce7239dc2=
8b4e1166803209947b8a875a99b9478ee94f7bc17399e886179ab2a0285dc11a3883f6fa439=
d0f2277dadbec8c355c379fc50e945897e1a738f6a55b09f6b8b6bdf6d4bc248219cbad3662=
a78a2f539c989e055e00b8efd42fbff978e1a5cc10f83df56117ece4d17f94a0a6d3803778e=
d53531419250c5a0fff6cad4ab401468dd054915b068cc8826ae1308a71b38060d68c9248d5=
9eea11c2c52a66d5f6bc0d7ae6cb44305c36e56068456d293b70037902e7b05a3ee0af71020=
1128dffc0c16c3306b66bd19b9ae5b91aded35ef33f07743e5b185a9f88a5c67d40270e3bbc=
f592167ceaf82ead693728d5129b50075edd5ce24863f3484b4b063599ed1327e1c87d0a205=
1fed3b1234a702722b686e4c9392a403b79726800dd6b691e516e44d9e836c190b10cf2bb26=
2bba98293c97f2c323e59acd0a1f988c5
** &lt;tt&gt;my_multisig_wallet_for_signer_1.dat&lt;/tt&gt;: &lt;pre&gt;ee7=
4a0f50943d7d1b65270028bb05133e87c832cdc1ef0a07c79db2093ca34328e3ba3dac0f979=
fad0d160bd00c8294ff1726d51b95ff3e1534e5a1900f3d7cd4f6d929985a94b9da2c11e4e0=
f7770cc53c6739fd099477323bd26a3eca9c8016e79848d15e274463424b8355cd73cced61f=
1816ac8bac87f8c650ee9052f50e347c52ad24b00794a9d5523714be2fdcf731f14b7a8d7c9=
3eab44c258e1c417d2837b9676832e8ce7239dc28b4e1166803209947b8a875a99b9478ee94=
f7bc17399e886179ab2a0285dc11a3883f6fa439d0f2277dadbec8c355c379fc50e945897e1=
a738f6a55b09f6b8b6bdf6d4bc248219cbad3662a78a2f539c989e055e00b8efd42fbff978e=
1a5cc10f83df56117ece4d17f94a0a6d3803778ed53531419250c5a0fff6cad4ab401468dd0=
54915b068cc8826ae1308a71b38060d68c9248d59eea11c2c52a66d5f6bc0d7ae6cb44305c3=
6e56068456d293b70037902e7b05a3ee0af710201128dffc0c16c3306b66bd19b9ae5b91ade=
d35ef33f07743e5b185a9f88a5c67d40270e3bbcf592167ceaf82ead693728d5129b50075ed=
d5ce24863f3484b4b063599ed1327e1c87d0a2051fed3b1234a702722b686e4c9392a403b79=
726800dd6b691e516e44d9e836c190b10cf2bb262bba98293c97f2c323e59acd0a1f988c5&l=
t;/pre&gt;

* Send to Signer 2:
** HMAC_KEY (hex): e0a20b5f5285fbaa35aad08fb70f5626c9abbe1b384a4950735b28ac=
a6325ff2
** MAC (hex): 81df9e064f1de1d5f754c4e20f9286f9d81b856d3965677a9f2430cb9297a=
d1f
** IV (hex) : 81df9e064f1de1d5f754c4e20f9286f9
** CIPHERTEXT (hex): dcd82038ef627d6cb2deb62d04c4ccbaa3a354633d960e46312c22=
791f039f23fd9782a1e3a63504c1e5b3a0770bb8d32fdf168738b6c03278f1391dd5d01e9aa=
fee7be2c8136ee018feff6fc8cdb926df13a36e115ddca8254934f56b7f700768c94cb8388a=
8297834de9affcd959417ae3d6ec3251387904f50f51f06306cc4d36eefc51418dd3b2c5454=
910a23ec67a40a3b918d2a740e812929aae949d8dde2c41cbbb3a2b7c2103788421c147f479=
4d6a26947c15ef4a99ceb825d0c5aaa78b8737d0ef712ba8e269a9941b1af5d217dcdd9cd06=
727fbdc70fabe3f5a8c09acff4e76992be7f27c6b12ca84739f62a6da86e5b79103d632c0dc=
8ab3f91fddb3cfbe67084dc4b861c4ac7c86fb171a058c98c67cffdc40ff17ae1533361cc6f=
b7b63657af0408cf30bf9d6d97aaacf9d3ff443eee61f207228cd91769ce83a0709c1be1847=
884c6a8fdc86ede66aef8e34fc509c49edf30f743bdc8f9052961ee340924ec2d1caadc6fd2=
86bb3e233c153cd08c1934127752dc28e0d12efa92a050c4061653edb1cbf2fd4b2ba4e038f=
0b44f5735f198e92571c029156f65f534bfc149f38d611829901372cfc0176b9d2f9ac6512b=
7f37941a02dff701df0bceadaacfc6935
** &lt;tt&gt;my_multisig_wallet_for_signer_2.dat&lt;/tt&gt;: &lt;pre&gt;81d=
f9e064f1de1d5f754c4e20f9286f9d81b856d3965677a9f2430cb9297ad1fdcd82038ef627d=
6cb2deb62d04c4ccbaa3a354633d960e46312c22791f039f23fd9782a1e3a63504c1e5b3a07=
70bb8d32fdf168738b6c03278f1391dd5d01e9aafee7be2c8136ee018feff6fc8cdb926df13=
a36e115ddca8254934f56b7f700768c94cb8388a8297834de9affcd959417ae3d6ec3251387=
904f50f51f06306cc4d36eefc51418dd3b2c5454910a23ec67a40a3b918d2a740e812929aae=
949d8dde2c41cbbb3a2b7c2103788421c147f4794d6a26947c15ef4a99ceb825d0c5aaa78b8=
737d0ef712ba8e269a9941b1af5d217dcdd9cd06727fbdc70fabe3f5a8c09acff4e76992be7=
f27c6b12ca84739f62a6da86e5b79103d632c0dc8ab3f91fddb3cfbe67084dc4b861c4ac7c8=
6fb171a058c98c67cffdc40ff17ae1533361cc6fb7b63657af0408cf30bf9d6d97aaacf9d3f=
f443eee61f207228cd91769ce83a0709c1be1847884c6a8fdc86ede66aef8e34fc509c49edf=
30f743bdc8f9052961ee340924ec2d1caadc6fd286bb3e233c153cd08c1934127752dc28e0d=
12efa92a050c4061653edb1cbf2fd4b2ba4e038f0b44f5735f198e92571c029156f65f534bf=
c149f38d611829901372cfc0176b9d2f9ac6512b7f37941a02dff701df0bceadaacfc6935&l=
t;/pre&gt;

* Send to Signer 3:
** HMAC_KEY (hex): 1f51ea067c121e2f86af5e1d484905046bc63e861573157d8b1ae9e7=
e47e224b
** MAC (hex): 159a91100cacd123480b7d085c8bb32ec8eb06f0391b6dc8fac07ae67eb37=
b81
** IV (hex) : 159a91100cacd123480b7d085c8bb32e
** CIPHERTEXT (hex): c7269d8be21d1cfe172e35aa106760f1fdc929fce19da8fb7f74f7=
59efec1ee02796fb1e8b008cf177f60a2021570f17aeeb41f8636858654082734b90959b98f=
d08419f901683c4ca3e76b3e482fea4c67162775e0d80bcb45df729f646c1364a3d8a7d1ff9=
61717b00897e877c1c0554d3502942149726806269c546ad2dd34ba286ddf5cd336b83aabf7=
091fa25e607faf7e54017d84113e1e3ec440b3704addea188b89293469306fc0a98570afdcf=
269026b2d2e760f466c1f75bcf75fdf030c0a692e5681fd4487e59d6e96451ff5b6b9f2521b=
8e95e796ef4ab0a917794d91a30fdac7ee9ddbd89d174831bd133ab12a74f52f6283ee2c5fe=
3d5a957a7c1a15530b2c5224f76d90057dc94f2ee34e28b037ae7f518cc6dfe725cd3e65764=
8de82b200ea77830eb93219f883998d3207a4ef5902d1119b0cde6b364bc1effb86109d9c2b=
abc8ab26dce90329779d8cd0d737e9825a25586aa3c8fa5317e3e433ff235b82f629de0504e=
3c992f8e8de299f62751bc1fcb2e75e0262c7a27be7068cea69b14f303e97c24b99ed29cae1=
42564e285657704b4c411d0d4f8c58819e2c0e0ffc3667eb5a408aad8a3023a5f00875e7dea=
b95dc365d8757f7b79815a4fd9e6de2b3
** &lt;tt&gt;my_multisig_wallet_for_signer_3.dat&lt;/tt&gt;: &lt;pre&gt;159=
a91100cacd123480b7d085c8bb32ec8eb06f0391b6dc8fac07ae67eb37b81c7269d8be21d1c=
fe172e35aa106760f1fdc929fce19da8fb7f74f759efec1ee02796fb1e8b008cf177f60a202=
1570f17aeeb41f8636858654082734b90959b98fd08419f901683c4ca3e76b3e482fea4c671=
62775e0d80bcb45df729f646c1364a3d8a7d1ff961717b00897e877c1c0554d350294214972=
6806269c546ad2dd34ba286ddf5cd336b83aabf7091fa25e607faf7e54017d84113e1e3ec44=
0b3704addea188b89293469306fc0a98570afdcf269026b2d2e760f466c1f75bcf75fdf030c=
0a692e5681fd4487e59d6e96451ff5b6b9f2521b8e95e796ef4ab0a917794d91a30fdac7ee9=
ddbd89d174831bd133ab12a74f52f6283ee2c5fe3d5a957a7c1a15530b2c5224f76d90057dc=
94f2ee34e28b037ae7f518cc6dfe725cd3e657648de82b200ea77830eb93219f883998d3207=
a4ef5902d1119b0cde6b364bc1effb86109d9c2babc8ab26dce90329779d8cd0d737e9825a2=
5586aa3c8fa5317e3e433ff235b82f629de0504e3c992f8e8de299f62751bc1fcb2e75e0262=
c7a27be7068cea69b14f303e97c24b99ed29cae142564e285657704b4c411d0d4f8c58819e2=
c0e0ffc3667eb5a408aad8a3023a5f00875e7deab95dc365d8757f7b79815a4fd9e6de2b3&l=
t;/pre&gt;

=3D=3DAcknowledgement=3D=3D

Special thanks to Pavol Rusnak, Dmitry Petukhov, Christopher Allen, Craig R=
aw, Robert Spigler, Gregory Sanders, Ta Tat Tai, Michael Flaxman, Pieter Wu=
ille and others for their feedback on the specification.

=3D=3DReferences=3D=3D

Original mailing list thread: <a href=3D"https://lists.linuxfoundation.org/=
pipermail/bitcoin-dev/2021-February/018385.html">https://lists.linuxfoundat=
ion.org/pipermail/bitcoin-dev/2021-February/018385.html</a>
</pre><br class=3D"gmail-Apple-interchange-newline"><br><br><br></div></div=
>

--0000000000008f208d05bf344999--