Abstract: A method for signing a signature for a private key for a cryptocurrency signature wallet device includes eight stages. The first stage includes accepting data items and creating and transmitting an unsigned transaction. The second stage includes storing the unsigned transaction. The third stage includes entering wait for notification status. The fourth stage includes sending signature request notification. The fifth stage includes searching for unsigned transactions and sending a selected unsigned transaction. The sixth stage includes receiving and signing a signature request and sending back a signature. The seventh stage includes outputting and reading portable data, and signing and transferring a signature. The eighth stage includes writing the signature in the unsigned transaction, summing up a number of signatures written in the signature fields, and transforming the signed transaction into the cryptocurrency transaction or returning system flow control to the third stage to loop.

Abstract: A wallet device comprising, a central control server device to accept a trading request data from external, a transaction manage device, a hot wallet server device, a cold wallet server device and a remote signature device, the transaction manager device comprising unit to create/output transaction data conforming to the bitcoin network in the internet, is located in-between the central server device creating internal format model transaction and other devices group of hot wallet server device, cold wallet server device and the remote signature device performing to sign multi-signatures, providing more secured wallet device for cryptocurrency.