Research corpus ConsensusBLC-STUDY-0225

OP_CHECKLOCKTIMEVERIFY

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.

Official external source only
Design paper
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Record

Authors: Peter Todd
Date: 2014
Publisher: Peter Todd
Version: Source cited by the 2014 study. The study is the reading. This page does not add a second essay.
Document ID: BLC-STUDY-0225
DOI: None recorded
Last reviewed: 1 October 2026
Licence: No licence recorded. Rights status under review.

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Direct answer

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.

Where to read

Official source — BIP 65
Blockchain Lab study, the canonical readingOriginal commentary. Not a transcription of the paper.

Metadata and commentary only. The reading is the study page.

Full text

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.

What changed

Status in the source: Deployed. A reading of the public specification, not a copy of it and not a certification.

Relationships

Canonical readingBIP 65 study
Related paperPBFT
Related paperTendermint
Related paperRaft

Cite this record

These citations point at the source document. They are not a licence to copy it.

Author–date

Todd, P. (2014). OP_CHECKLOCKTIMEVERIFY. Peter Todd. https://bips.dev/65

BibTeX

@techreport{bip652014,
  title = {OP_CHECKLOCKTIMEVERIFY},
  author = {Peter Todd},
  year = {2014},
  institution = {Peter Todd},
  url = {https://bips.dev/65},
  note = {Rights status: Official external source only. Blockchain Lab record: https://blockchainlab.com/research/corpus/papers/bip-65}
}

RIS

TY  - RPRT
TI  - OP_CHECKLOCKTIMEVERIFY
AU  - Peter Todd
PY  - 2014
PB  - Peter Todd
UR  - https://bips.dev/65
N1  - Rights status: Official external source only
ER  -

CSL-JSON

[
  {
    "type": "report",
    "id": "BLC-STUDY-0225",
    "title": "OP_CHECKLOCKTIMEVERIFY",
    "author": [
      {
        "literal": "Peter Todd"
      }
    ],
    "issued": {
      "date-parts": [
        [
          2014
        ]
      ]
    },
    "publisher": "Peter Todd",
    "URL": "https://bips.dev/65",
    "note": "Rights status: Official external source only. Not a licence to republish the paper."
  }
]

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Rights record

Source status: Official source
Use status: Metadata and commentary only. The reading is the study page.
Rights: Official external source only
Training and retrieval: Not permitted from this site. There is no rights-cleared full text to retrieve or to train on.

Rights and licensing Corrections