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From: vjudeu@gazeta.pl
To: bitcoin-dev@lists.linuxfoundation.org
Date: Sun, 01 May 2022 18:18:40 +0200
Message-Id: <68441995-c7d44f8b69d56a75112afa495bca5bf9@pmq6v.m5r2.onet>
Subject: [bitcoin-dev] Password-protected wallet on Taproot
Precedence: list

It seems that Taproot allows us to protect each individual public key with =
a password. It could work in this way: we have some normal, Taproot-based p=
ublic key, that is generated in a secure and random way, as it is today in =
Bitcoin Core wallet. Then, we can create another public key, just by taking=
 password from the user, executing SHA-256 on that, and using it as a priva=
te key, so the second key will be just a brainwallet. Then, we can combine =
them in a Schnorr signature, forming 2-of-2 multisig, where the first key i=
s totally random, and the second key is just a brainwallet that takes a pas=
sword chosen by the user. By default, each key can be protected with the sa=
me password, used for the whole wallet, but it could be possible to choose =
different passwords for different addresses, if needed. Descriptors should =
handle that nicely, in the same way as they can be used to handle any other=
 2-of-2 multisig.