{"document_id":"BLC-STUDY-0542","slug":"bip-372","title":"Pay-to-contract tweak fields for PSBT","authors":"Maxim Orlovsky","year":2022,"date_label":"2022","publisher":"Maxim Orlovsky","paper_type":"Design paper","category":"Privacy","topics":["Privacy"],"source_url":"https://bips.dev/372","source_label":"BIP 372","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 2022 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 372, Pay-to-contract tweak fields for PSBT. The new per-input type is defined as follows: {| ! Name ! ! ! Description ! ! Description ! Versions Requiring Inclusion ! Versions Requiring Exclusion ! Versions Allowing Inclusion |- | P2C Key Tweak | PSBT_IN_P2C_TWEAK = 0x19 | | 33 bytes of compact public key serialization specifying to which keys the P2C tweak may be applied (i.e.","canonical_url":"https://blockchainlab.com/whitepaper/bip-372","record_url":"https://blockchainlab.com/research/corpus/papers/bip-372","study_url":"https://blockchainlab.com/whitepaper/bip-372","last_reviewed":"2026-10-01","last_checked":"2026-10-01","relationships":[{"rel":"Canonical reading","label":"BIP 372 study","href":"/whitepaper/bip-372"},{"rel":"Related paper","label":"Groth16","href":"/whitepaper/groth16"},{"rel":"Related paper","label":"Bulletproofs","href":"/whitepaper/bulletproofs"},{"rel":"Related paper","label":"Taproot","href":"/whitepaper/taproot"}]}