A TXID (Transaction ID) is a unique feature that is added to transactions to make them easy to find on the blockchain.

In a transaction on the blockchain, multiple details are often public. The address of the sender and recipient, these are the public keys. These keys are public and unique. The amount is often also public but not unique; multiple people can transfer the same amount. The date and time are also often public. Blockchains can be viewed by everyone. For example, it is possible to search for a public key that shows all transactions and the wallet's balance. A specific transaction is characterized by a TXID (Transaction ID). This unique feature is created when the transaction is sent. The sender can track the transaction with this attribute. The attribute is public and can therefore also be used by the recipient or third parties to track a transaction. For example, if a transaction does not arrive, the TXID can be used to check whether the transaction has already been processed.