A blind proxy signature without message secrecy is proposed. The new scheme can protect the proxy signer's privacy against the other third parties except the original signer, only the designed receiver can validate the proxy signature, but the designed verifier cannot confirm the identity of the proxy signer. The designed verifier can unveil the identity of the proxy signer via the original signer when the dispute exists. Based on the proposed scheme, a novel efficient threshold shared verification signature scheme is constructed.