A TXID is always 32 bytes 64 characters and hexadecimal. Due to historical accident, the tx length block hashes that bitcoin core uses length byte-reversed.
May be something like using openssl bignum to store hashes or something like that, then printing bitcoin as a number. In other words, this was a slight oversight in the early development of Bitcoin that has now become a standard.
For example:. You use a TXID when you want to use an existing output as an input in a new transaction. Because after all, a Here is a unique identifier 1 for a transaction. Hash functions like SHA are great for creating identification numbers, because they will take in any string of data and always spit out a short yet unique result.
These coinbase transactions used the same address when claiming the block reward from two different blocks. This meant that their transaction data was the same, and so the TXIDs were the same also. Here are the transactions and the blocks they were included in:.
Later, BIP 34 required bitcoin transactions to include the height of the block the were mining in to their transaction data, so that coinbase transactions could be different. Thanks to DJBunnies for pointing this out to me. I'll let you know about cool website updatesor if something seriously interesting happens in bitcoin. Click at this page worry, it doesn't happen very often.
Examples: ffcb9dcf57adfe4c75cffbcee9e16 - First ever Bitcoin transaction to Hal Finney in Searching for TXIDs in the blockchain. Because welcome to Bitcoin. Coinbase transactions having the same TXID. Here are the transactions and the blocks they were included in: e3bf3d07d4bd5f1dbfe07ba2c4cbcd81b84eebfb block 91, a2dc26eff2edce5a6c6cdf3fdd08e block 91, fa18ca3c2d2a1faeacaccb7cd d5dd2a3dfcecb40ebdcafed block 91, af0aedb1acee3daf36cf5defdb8de83d6ff2f block 91, a4d0affccb1fe0e4c8ee0caec The Fix.
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