Hi woltx, 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 would 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 > compressed public key with even y. Not sure about the concerns expressed by Andrew Poelstra in the pull request related to rogue-key attacks. > Tutorial updated: > https://gist.github.com/w0xlt/c81277ae8677b6c0d3dd073893210875 > "warnings": "This address is not a new identity. It is a re-use of an > existing 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: > > . Silent payments now use all inputs to create transactions. Previously, they > only used the first input. This change increases privacy and makes silent > payments compatible with coinjoin. > > . `getspaddress` RPC renamed to `getsilentaddress` for clarity > > . Added support for silent payment in PSBT via `walletcreatefundedpsbt` RPC. > > . Added a new index scheme (which stores the sum of input public keys for > each transaction). The previous index > `bitcoin/signet/indexes/silentpaymentindex` should be removed as it is no > longer compatible with this new version. > > For reviewers: > > Now, silent payments use the scheme `hash(i1*X + i2*X + i3*X + ...)*G + X == > hash(x*(I1+I2+I3+...))*G + X`, as described here: > https://gist.github.com/RubenSomsen/c43b79517e7cb701ebf77eec6dbb46b8#variant-using-all-inputs > > As inputs can be Taproot, this introduced a new issue as > `bitcoin-core/secp256k1` does not support x-only public key sum (perhaps due > to missing prefix byte). > > I opened a new PR (#1143) to add a function to convert from x-only to > compressed public key with even y. This is the solution being used by the > current silent payment implementation. > > Tutorial updated: > https://gist.github.com/w0xlt/c81277ae8677b6c0d3dd073893210875 _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
