Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for communicating and sharing blockchain data. One of the methods includes sending, by a consensus node of a blockchain network, current state information associated with a current block of a blockchain to a trusted node with proof of authority outside of the blockchain network; sending a hash value to the trusted node for retrieving an account state stored in the historic state tree; receiving the account state in response to sending the hash value; and verifying that the account state is part of the blockchain based on the hash value.