{"document_id":"BLC-STUDY-0530","slug":"bip-197","title":"Hashed Time-Locked Collateral Contract","authors":"Matthew Black","year":2019,"date_label":"2019","publisher":"Matthew Black","paper_type":"Design paper","category":"Interoperability","topics":["Interoperability"],"source_url":"https://bips.dev/197","source_label":"BIP 197","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 2019 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 197, Hashed Time-Locked Collateral Contract. A script for generalized debt agreement contract based on Hashed Time-Lock Contract (BIP 199) transactions according to the Atomic Loans specification (https://arxiv.org/pdf/1901.05117.pdf).","canonical_url":"https://blockchainlab.com/whitepaper/bip-197","record_url":"https://blockchainlab.com/research/corpus/papers/bip-197","study_url":"https://blockchainlab.com/whitepaper/bip-197","last_reviewed":"2026-10-01","last_checked":"2026-10-01","relationships":[{"rel":"Canonical reading","label":"BIP 197 study","href":"/whitepaper/bip-197"},{"rel":"Related paper","label":"Lightning","href":"/whitepaper/lightning"},{"rel":"Related paper","label":"IBC","href":"/whitepaper/ibc"},{"rel":"Related paper","label":"Atomic swaps","href":"/whitepaper/atomic-swaps"}]}