An opcode that prevents an output from being spent before an absolute block height or time.
CHECKLOCKTIMEVERIFY is best understood as part of a system rather than as an isolated definition. Its related coordinates show the mechanisms, incentives and historical records that give the term practical meaning.
CHECKLOCKTIMEVERIFY sits between protocol rules, economic incentives and software operated by independent participants. In Bitcoin, no component is authoritative by itself: miners propose history, fully validating nodes enforce validity, and users decide which rules and software they accept.
Understanding CHECKLOCKTIMEVERIFY helps distinguish a verifiable Bitcoin mechanism or historical record from slogans, products and market narratives.
For the clearest picture, read this entry together with Timelock, CHECKSEQUENCEVERIFY, Payment channel, Peter Todd. The reverse links also lead from Bitcoin Script opcode, CHECKSEQUENCEVERIFY, Peter Todd.
Linked to related atlas coordinates
Grounded in a source record
Explains function and trade-offs
Part of the open Bitcoin knowledge graph