The transaction hash, often referred to as the transaction ID (TxID), is created as a cryptographic hash, usually utilizing the SHA-256 algorithm in Bitcoin or Keccak-256 in Ethereum. This hash is derived from the transaction's data and serves as a unique fingerprint for that transaction, enabling users and nodes to accurately track and verify transactions in the blockchain ledger. The transaction hash typically includes transaction details such as sender's address, recipient's address, amount transferred, and timestamp, making it easy to verify the status of a transaction. Once a transaction is confirmed, its hash is immutable, providing a trustworthy way to audit and track transaction history.