Bitcoin get id. What is a Bitcoin transaction ID and where can I find it? – Quppy
The hash of a transaction's data.
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A Transaction ID is basically an identification number for a bitcoin transaction. Examples: ffcb9dcf57adfe4c75cffbcee9e16 - First ever Bitcoin transaction to Hal Finney in A TXID is always 32 bytes 64 characters and hexadecimal.
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Because welcome to Bitcoin. Due to historical accident, the tx and block hashes that bitcoin core uses are byte-reversed.
May be something like using openssl bignum to store hashes or something like that, then printing them as a number. Where are TXIDs used?
Searching the blockchain. Spending outputs. You use a TXID when you want to use an existing output as an input in a new transaction.
To refer to an existing output, you use the txid it was created in, along with the vout number for that transaction. Because after all, a TXID is a unique identifier 1 for a transaction.
Notes Why hash twice? Why not once?
Things often get hashed twice in bitcoin for super-extra security. Coinbase transactions having the same TXID. These coinbase transactions used the same address when claiming the block reward from two different blocks.
This meant that their transaction data was bitcoin get id same, and so the TXIDs were the same also. Here are the transactions and the blocks they were included in:.
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- blockchain - How do I find the transaction ID of what I just transacted? - Bitcoin Stack Exchange
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