About ScriptSig
ScriptSig is a bitcoin custody and cosigning service focused on being a part of your private key custody strategy.
“Not your keys, not your bitcoin” and “be your own bank” are popular community mantras advocating to control and secure your own private keys in order to eliminate counterparty risk and maintain your financial sovereignty. While we agree with the sentiment behind these—championing personal responsibility and financial freedom—we also recognize this advice is not practical for most people. For the average user, this is a riskier proposition than delegating custody to a third-party.
Through the use of multisignature scripts and the emerging transaction cosigning standard of BIP-174, we provide a crucial building block for hodlers to mitigate the risks assumed by either personally securing their own bitcoin or fully trusting a third-party custodian with this duty.
We believe a hybrid of self and third-party custody to be the solution that gives the best balance between usability and security.
How it Works
ScriptSig integrates with existing multisignature software wallets—currently the open-source wallets: BitPay and Copay. When setting up a shared (multisig) wallet in these apps, you can use the invitation code generated by them to connect the wallet to your ScriptSig account. Doing so, sets the wallet up in such a way that one of the several private keys that controls the addresses created by your wallet is securely stored by ScriptSig. When you're ready to spend your bitcoin, you can create the transaction in your wallet app, then review and approve it from within your ScriptSig account. Once approved, we'll sign the transaction and send the signature back to your BitPay or Copay wallet app. From there, you can then broadcast your transaction to the Bitcoin network.
Setting up multisig addresses like this and using cryptographic keys from several independent devices and providers protects your bitcoin in the event of one or more private keys being compromised through loss or theft.
Integrate your Wallet with ScriptSig
Wallet and other bitcoin application developers who are interested in providing additional security options for their users can learn how to integrate with us by visiting our API documentation and sending any questions to developers@scriptsig.io.