Timestamp generation method and apparatus, and electronic device and storage medium

An apparatus for generating a timestamp, comprising:

• a processor and a memory, wherein
• the memory is configured to store program codes and transmit the program codes to the processor;
• and
• the processor is configured to perform:
• obtaining a file record;
• calculating a hash value of the file record;
• sending the hash value to a random signer, and receiving a signature result returned by the random signer, wherein the signature result is generated in a case that the random signer signs the hash value and a receiving time instant, and the receiving time instant is a time instant when the random signer receives the hash value;
• determining whether an address of a data owner is the same as a sender address of a transaction;
• storing, in response to the address of the data owner being different from the sender address of the transaction, the file record being not 0, or a data section k in the file record being not 0, a symmetric key for performing an encryption operation on the file record into a blockchain;
• and
• storing the signature result in the blockchain as a timestamp of the file record;
• wherein the symmetric key is a one-time symmetric key and is written into a data structure of the file record in a block;
• and
• the timestamp and a height of the block in the blockchain are in one-to-one correspondence.