Hi, At SeedHammer we're interested in standard, compact output descriptors to make self-contained metal engraved backups feasible. To that end, we're proposing a descriptor format based on the PSBT binary encoding. The format has not reached widespread consensus, never mind adoption, so at this point we're soliciting comments before formally proposing it as a BIP.
See [proposal], [implementation] and [playground] for details and examples. The format is a binary and compact serialization specification for the [wallet-policies] BIP. Features: - Based on the binary [BIP174] PSBT format, including re-using the compact PSBT_GLOBAL_XPUB encoding for extended keys. - The descriptor itself is encoded in the same textual format as described in BIPs 380-386 (+389). - Key references (always) use the wallet-policies format @<key-index>. - Miniscript is trivially supported, except inline keys are not allowed, and pk(NAME) expressions are replaced with indexed (@<idx>) key references. - Metadata such as labels and birthdate blocks are encoded as PSBT map entries. Known issues: - CBOR vs PSBT. Blockchain Commons believes[0] that a CBOR based format is better because it is a widely used binary encoding standard, whereas we believe the complexity of CBOR doesn't justify its cost compared to the PSBT encoding already widely supported by wallet software. - The proposal specifies a separate header and magic; should the format instead be an extension to the PSBT format? Thanks, E [proposal] https://github.com/BlockchainCommons/Research/issues/135 [implementation] https://github.com/seedhammer/bip-serialized-descriptors [playground] https://go.dev/play/p/nouZlbbcEWt [wallet-policies] https://github.com/bitcoin/bips/blob/bb98f8017a883262e03127ab718514abf4a5e5f9/bip-wallet-policies.mediawiki [BIP174] https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki [0] https://github.com/BlockchainCommons/Research/issues/135#issuecomment-1789644032 _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
