The digital signature is a small block of data that is attached to documents someone signs to assure the identity of the signee.
Are digital signatures safe? Digital signatures are secure. Moreover, it is complicated to falsify one.
What do digital signatures do? They allow value control with respect to the document being transmitted, guarantee protection from falsification. Any signature is generated using a private key that is known only to its owner. They are, therefore, unable to repudiate their signature added to the document. In blockchain, every transaction is digitally signed by the sender of the asset.