In the distributed network of blockchain, the communication and trust between nodes need to rely on digital signature technology, which mainly realizes identity confirmation and information authenticity and integrity verification.

digital signature

Digital signature (also known as public key digital signature and electronic signature) is an ordinary physical signature, similar to the signature written on paper, but it is realized by using the technology in the field of public key encryption, which is used to identify digital information. A set of digital signatures usually defines two complementary operations, one for signing and the other for verification. It is a number string, which can only be generated by the sender of the information, and no one else can forge it. This number string is also an effective proof of the authenticity of the information sent by the information sender. Simply prove "I am who I am".