A method for processing blockchain member management data, the method comprising: storing, by blockchain members, a contract rule, wherein the contract rule comprises a rule that is agreed upon by the blockchain members and is used for determining whether a registering user can join a blockchain; receiving, by a blockchain member, a registration transaction message from the registering user based on the contract rule, wherein the registration transaction message comprises identification information of a plurality K of certification authorities and signature certificates of the plurality K of certification authorities; dynamically updating a key information of at least one certification authority of the plurality K of certification authorities, comprising: generating, by the at least one certification authority, a temporary key pair comprising a temporary private key and a temporary public key; signing, by the at least one certification authority, the temporary public key of the temporary key pair using a previous private key of the at least one certification authority; broadcasting, by the at least one certification authority, the generated temporary public key to the blockchain members; verifying, by the blockchain members, the generated temporary public key by using a previous public key of the at least one certification authority; and updating the generated temporary public key to be a new public key of the at least one certification authority; performing, by the blockchain member, verification of the signature certificates based on the identification information by using the dynamically updated key information of the at least one certification authority of the plurality K of certification authorities; and determining, by the blockchain member, that the registering user becomes a new blockchain member in response to determining that verification on the signature certificates of the plurality K of certification authorities succeeds. storing, by blockchain members, a contract rule, wherein the contract rule comprises a rule that is agreed upon by the blockchain members and is used for determining whether a registering user can join a blockchain; receiving, by a blockchain member, a registration transaction message from the registering user based on the contract rule, wherein the registration transaction message comprises identification information of a plurality K of certification authorities and signature certificates of the plurality K of certification authorities; dynamically updating a key information of at least one certification authority of the plurality K of certification authorities, comprising: generating, by the at least one certification authority, a temporary key pair comprising a temporary private key and a temporary public key; signing, by the at least one certification authority, the temporary public key of the temporary key pair using a previous private key of the at least one certification authority; broadcasting, by the at least one certification authority, the generated temporary public key to the blockchain members; verifying, by the blockchain members, the generated temporary public key by using a previous public key of the at least one certification authority; and updating the generated temporary public key to be a new public key of the at least one certification authority; generating, by the at least one certification authority, a temporary key pair comprising a temporary private key and a temporary public key; signing, by the at least one certification authority, the temporary public key of the temporary key pair using a previous private key of the at least one certification authority; broadcasting, by the at least one certification authority, the generated temporary public key to the blockchain members; verifying, by the blockchain members, the generated temporary public key by using a previous public key of the at least one certification authority; and updating the generated temporary public key to be a new public key of the at least one certification authority; performing, by the blockchain member, verification of the signature certificates based on the identification information by using the dynamically updated key information of the at least one certification authority of the plurality K of certification authorities; and determining, by the blockchain member, that the registering user becomes a new blockchain member in response to determining that verification on the signature certificates of the plurality K of certification authorities succeeds.