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Update 09_2_Using_CLTV_in_Scripts.md

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# 9.2: Using CLTV in Scripts # 9.2: Using CLTV in Scripts
> **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning. > :information_source: **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning.
`OP_CHECKLOCKTIMEVERIFY` (or CLTV) is the natural complement to `nLockTime`. It moves the idea of locking transactions by an absolute time or blockheight into the realm of opcodes, allowing for the locking of individual UTXOs. `OP_CHECKLOCKTIMEVERIFY` (or CLTV) is the natural complement to `nLockTime`. It moves the idea of locking transactions by an absolute time or blockheight into the realm of opcodes, allowing for the locking of individual UTXOs.
> **VERSION WARNING:** CLTV became available with Bitcoin Core 0.11.2, but should be fairly widely deployed at this time. > :warning: **VERSION WARNING:** CLTV became available with Bitcoin Core 0.11.2, but should be fairly widely deployed at this time.
## Remember nLockTime ## Remember nLockTime