Abstract: A data sharing method includes: reading, by a second participant of a plurality of participants participating in data sharing, first data and a first ring signature from a blockchain; verifying, by the second participant, the first ring signature by using a ring signature verification algorithm according to the public keys of the plurality of participants, the first data and the first ring signature; and using the first data when the second participant verifies that the first ring signature is legal. In the data sharing method according to the embodiments of the present invention, privacy of a data sharer is protected and the data sharer has authority to share data is believed by a verifier, and a responsibility investigation mechanism of the data sharing is established.