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# Transaction Version History
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2025-01-27 20:50:26 +01:00
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2021-03-16 01:22:30 -04:00
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| Version Number | Proposed In | Released | Summary |
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2025-01-27 20:50:26 +01:00
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| -------------- | ----------- | -------- | ------- |
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2021-03-16 01:22:30 -04:00
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|||Aug 2017| Bitcoin Cash hard fork.|
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|2|[BIP-0068](/history/bips)|May 2016<br>Bitcoin Core 0.12.1|Added relative lock-time (RLT) consensus-enforced semantics of the transaction input sequence number field.|
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2025-01-27 20:50:26 +01:00
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|1|||As used in the genesis block.|
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