{"document_id":"BLC-STUDY-0278","slug":"bip-373","title":"MuSig2 PSBT Fields","authors":"Ava Chow","year":2024,"date_label":"2024","publisher":"Ava Chow","paper_type":"Design paper","category":"Privacy","topics":["Privacy"],"source_url":"https://bips.dev/373","source_label":"BIP 373","legacy_pdf_path":null,"sha256":null,"sha256_note":"No hash is published. This build does not store those PDF bytes, so a checksum would be invented. Where a legacy path exists, it points at the Internet Archive copy of the old library.","version":"Source cited by the 2024 study. The study is the reading. This page does not add a second essay.","doi":null,"rights_status":"Official external source only","source_status":"Official source","use_status":"Metadata and commentary only. The reading is the study page.","licence":null,"licence_label":"No licence recorded. Rights status under review.","full_text":null,"full_text_reason":"Full text is not published on this page. Public availability is not a licence to republish a document. Blockchain Lab has not recorded a licence that permits an HTML transcription, a training set, or a retrieval corpus of the paper. Text on this page is Blockchain Lab's own wording, or a pointer to a study that is also Blockchain Lab's wording.","editorial_line":"BIP 373, MuSig2 PSBT Fields. The new per-input types are defined as follows: {| ! Name ! ! ! ! Versions Requiring Inclusion ! Versions Requiring Exclusion ! Versions Allowing Inclusion |- | rowspan=\"2\"|MuSig2 Participant Public Keys | rowspan=\"2\"| PSBT_IN_MUSIG2_PARTICIPANT_PUBKEYS = 0x1a | | | rowspan=\"2\"| | rowspan=\"2\"| | rowspan=\"2\"| 0, 2 |- | The MuSig2 aggregate public key (compressed) '''Why the compressed aggregate public key instead of x-only?''' [[bip-0032.mediawiki|BIP 32]] public keys can be derived from a [[bip-0327.mediawiki|BIP 327]] MuSig2 aggregate public key (see: [[bip-0328.mediawiki|BIP 328]]).","canonical_url":"https://blockchainlab.com/whitepaper/bip-373","record_url":"https://blockchainlab.com/research/corpus/papers/bip-373","study_url":"https://blockchainlab.com/whitepaper/bip-373","last_reviewed":"2026-10-01","last_checked":"2026-10-01","relationships":[{"rel":"Canonical reading","label":"BIP 373 study","href":"/whitepaper/bip-373"},{"rel":"Related paper","label":"Groth16","href":"/whitepaper/groth16"},{"rel":"Related paper","label":"Bulletproofs","href":"/whitepaper/bulletproofs"},{"rel":"Related paper","label":"Taproot","href":"/whitepaper/taproot"}]}