372 - Pay-to-contract tweak fields for PSBT
BIP: 372 Layer: Applications Title: Pay-to-contract tweak fields for PSBT Author: Maxim Orlovsky Discussions-To: Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0372 Status: Draft Type: Standards Track Created: 2022-01-16 License: BSD-2-Clause Requires: BIP-174 ==Introduction== ===Abstract=== This document proposes additional fields for BIP 174 PSBTv0 and BIP 370 PSBTv2 that allow for pay-to-contract key tweaking data data to be included in a PSBT of any version. These will represent an extra-transaction information required for the signer to produce valid signatures spending previous outputs. ===Copyright=== This BIP is licensed under the 2-clause BSD license. ===Background=== Key tweaking is a procedure for creating a cryptographic commitment to some message using elliptic curve properties. The procedure uses the discrete log problem (DLP) to commit to an extra-transaction message. This is done by adding to a public key (for which the output owner k...