Transaction Version History
| Version Number | Proposed In | Released | Summary |
|---|---|---|---|
| CHIP-2021-01 Restrict Transaction Version | May 2023 HF-20230515 |
Transaction versions other than 1 and 2 became invalid by consensus (previously they were only non-standard). | |
| Aug 2017 | Bitcoin Cash hard fork. | ||
| 2 | BIP-0068 | May 2016 Bitcoin Core 0.12.1 |
Added relative lock-time (RLT) consensus-enforced semantics of the transaction input sequence number field. |
| 1 | As used in the genesis block. |