Implementations of this specification provide a method and an apparatus for creating a blockchain account and verifying blockchain transactions. An example method performed by a blockchain platform includes receiving a transaction, the transaction including at least an initiator field that specifies an account to be created, a receiver field that specifies a pre-determined field value, and a data field that specifies a user-defined key control rule. The user-defined key control rule includes at least one 3-tuple, and each 3-tuple includes a key identifier, an action identifier, and a permission setting. The blockchain platform seals the transaction into a block, and sends the sealed transaction to at least one other full node in the blockchain network.