Plain English
A transaction hash (or TXID) is a 64-character cryptographic fingerprint identifying a specific transaction on a blockchain. Every send, swap, mint, or contract interaction produces one. You paste it into a block explorer to see exactly what happened.
How it actually works
The hash is generated by running the transaction’s contents (sender, recipient, amount, data, signature, nonce, gas) through SHA-256 (Bitcoin) or Keccak-256 (Ethereum). The result is deterministic — same input always produces the same hash — and effectively unforgeable.
What it means for you
Every meaningful transaction should be filed. Send a TXID with any payment confirmation or DeFi support ticket — it is the universal receipt. For tax record-keeping, exporting TXIDs alongside CSVs from your wallets is the cleanest audit trail you can build.
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Educational content only. Not investment, tax, or legal advice.