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Since when lock time exist in Bitcoin transactions?

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    You may be thinking of the CLTV opcode (which allows putting requirements on the nLockTime of spending transactions), which was added in BIP65 (activated in 2013). – Pieter Wuille May 16 '20 at 21:02
  • There was no mistake :) – M A May 17 '20 at 11:54
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Since the very beginning. Transactions have had the nLockTime field since Bitcoin 0.1.0.

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    Though interestingly, it worked differently until a soft fork. It used to be signed, and was changed to unsigned. – Claris May 17 '20 at 2:01

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