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authoralicexbt <alicexbt@protonmail.com>2022-10-12 09:04:35 +0000
committerbitcoindev <bitcoindev@gnusha.org>2022-10-12 09:04:46 +0000
commit41edd8ce04656ba4d53e52b214fe117e5ee30cd3 (patch)
treed10cc6b3396b4d0f943564aa963d0df84def2fb8 /62/7e2046711331558aec80a9d0902e43820cb205
parent62a9539746f55aa29bc2ae01a5fae0a5fd0e1d92 (diff)
downloadpi-bitcoindev-41edd8ce04656ba4d53e52b214fe117e5ee30cd3.tar.gz
pi-bitcoindev-41edd8ce04656ba4d53e52b214fe117e5ee30cd3.zip
Re: [bitcoin-dev] Silent Payment v4 (coinjoin support added)
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+Date: Wed, 12 Oct 2022 09:04:35 +0000
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+To: woltx <woltx@protonmail.com>
+From: alicexbt <alicexbt@protonmail.com>
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+Subject: Re: [bitcoin-dev] Silent Payment v4 (coinjoin support added)
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+Hi=C2=A0woltx,
+
+Thanks for working on silent payments improving it in each version.
+
+1) All inputs being used sounds good although I do not understand how it wo=
+uld benefit coinjoin.
+2) New RPC command name is better.
+
+> I opened a new PR (#1143) to add a function to convert from x-only to com=
+pressed public key with even y.=20
+
+Not sure about the concerns expressed by Andrew Poelstra in the pull reques=
+t related to rogue-key attacks.
+
+> Tutorial updated: https://gist.github.com/w0xlt/c81277ae8677b6c0d3dd07389=
+3210875
+> "warnings": "This address is not a new identity. It is a re-use of an exi=
+sting identity with a different label."
+
+I could not understand the warning in the output for `getsilentaddress` RPC=
+ when used with a label.
+
+/dev/fd0
+
+Sent with Proton Mail secure email.
+
+------- Original Message -------
+On Tuesday, October 11th, 2022 at 12:32 PM, woltx via bitcoin-dev <bitcoin-=
+dev@lists.linuxfoundation.org> wrote:
+
+
+> Silent Payment v4 (coinjoin support added)
+> Changes:
+>=20
+> . Silent payments now use all inputs to create transactions. Previously, =
+they only used the first input. This change increases privacy and makes sil=
+ent payments compatible with coinjoin.
+>=20
+> . `getspaddress` RPC renamed to `getsilentaddress` for clarity
+>=20
+> . Added support for silent payment in PSBT via `walletcreatefundedpsbt` R=
+PC.
+>=20
+> . Added a new index scheme (which stores the sum of input public keys for=
+ each transaction). The previous index `bitcoin/signet/indexes/silentpaymen=
+tindex` should be removed as it is no longer compatible with this new versi=
+on.
+>=20
+> For reviewers:
+>=20
+> Now, silent payments use the scheme `hash(i1*X + i2*X + i3*X + ...)*G + X=
+ =3D=3D hash(x*(I1+I2+I3+...))*G + X`, as described here: https://gist.gith=
+ub.com/RubenSomsen/c43b79517e7cb701ebf77eec6dbb46b8#variant-using-all-input=
+s
+>=20
+> As inputs can be Taproot, this introduced a new issue as `bitcoin-core/se=
+cp256k1` does not support x-only public key sum (perhaps due to missing pre=
+fix byte).
+>=20
+> I opened a new PR (#1143) to add a function to convert from x-only to com=
+pressed public key with even y. This is the solution being used by the curr=
+ent silent payment implementation.
+>=20
+> Tutorial updated: https://gist.github.com/w0xlt/c81277ae8677b6c0d3dd07389=
+3210875
+
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-30 12:16:55 +0000