A digital signature, sometimes called a digital fingerprint, is a system for assuring that data and documents in transit come from a recognized sender and that the message itself has not been altered.
Digital signatures are valid when there is high confidence that the sender is known and the message or item transmitted has not been tampered with. These respective prerequisites are called authentication and integrity.
Digital signatures are used in cases where authentication and integrity are a core component of the sender-recipient exchange. For example they are commonplace among security product suites and are used for commercial document transmission, software licensing, and payments.
"Financial regulations such as PSD2 often include requirements for the regulated entity to provide digital signatures to protect the authenticity and integrity of payments."