- There was a unique situation in Bitcoin's history where the same TXID (above) occurred in multiple blocks: [91,722](https://mempool.space/block/00000000000271a2dc26e7667f8419f2e15416dc6955e5a6c6cdf3f2574dd08e) and [91,880](https://mempool.space/block/00000000000743f190a18c5577a3c2d2a1f610ae9601ac046a38084ccb7cd721). As a result, BIP 30 was implemented to prevent blocks from containing duplicate TXIDs, and BIP 34 was introduced to require coinbase transactions to include block height in their data.
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