What does the term "endorsement" signify in the context of blockchain transactions?

In the context of blockchain transactions, "endorsement" refers to the process by which a peer node in the blockchain network verifies and signs off on the validity of a transaction proposal. This typically involves checking the transaction against a set of predefined rules and ensuring that it meets all necessary criteria for inclusion in the blockchain. By providing an endorsement, the peer effectively certifies that the transaction is valid and can be trusted.

This step is crucial for maintaining consensus within the network and ensuring that all participants can rely on the accuracy and legitimacy of the transactions being added to the blockchain. The endorsement mechanism facilitates the decentralized nature of blockchain by allowing multiple peers to validate transactions rather than relying on a central authority, which enhances security and trust among participants.

The other choices, while related to the transaction lifecycle, don't accurately capture the specific meaning of endorsement within the blockchain context. Endorsement is specifically about the positive validation of a transaction, rather than mere approval, finalization, or rejection.