{"document_id":"BLC-STUDY-0225","slug":"bip-65","title":"OP_CHECKLOCKTIMEVERIFY","authors":"Peter Todd","year":2014,"date_label":"2014","publisher":"Peter Todd","paper_type":"Design paper","category":"Consensus","topics":["Consensus"],"source_url":"https://bips.dev/65","source_label":"BIP 65","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 2014 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 65, OP_CHECKLOCKTIMEVERIFY. A new opcode (OP_CHECKLOCKTIMEVERIFY) for the Bitcoin scripting system that allows a transaction output to be made unspendable until some point in the future.","canonical_url":"https://blockchainlab.com/whitepaper/bip-65","record_url":"https://blockchainlab.com/research/corpus/papers/bip-65","study_url":"https://blockchainlab.com/whitepaper/bip-65","last_reviewed":"2026-10-01","last_checked":"2026-10-01","relationships":[{"rel":"Canonical reading","label":"BIP 65 study","href":"/whitepaper/bip-65"},{"rel":"Related paper","label":"PBFT","href":"/whitepaper/pbft"},{"rel":"Related paper","label":"Tendermint","href":"/whitepaper/tendermint"},{"rel":"Related paper","label":"Raft","href":"/whitepaper/raft"}]}