Securing Blockchain Wallets Efficiently Based on Threshold ECDSA Scheme Without Trusted Center

Abstract

Using the private key stored in the blockchain wallet to sign the transaction is the only way to trade on the blockchain. Once the private key stored in the wallet is lost or leaked, it will cause irreparable loss. At present, the mainstream wallet management schemes store the wallet in a single location or rely on the participation of trusted center, which can not resist single point failure. Aiming at the protect the security of blockchain wallet, this paper proposes a blockchain wallet protection scheme against single point failure based on threshold elliptic curve digital signature without trusted center. In this scheme, participants cooperate to generate public and private keys and sharing private key without the participation of trusted center. The participants who exceed the threshold number can sign the transaction by constant rounds, which can effectively resist single point attack and ensure the security of wallet. And the security of the scheme meets the requirements of unforgeability, anonymity and robustness.