Seed splitting and firmware extension for secure cryptocurrency key backup, restore, and transaction signing platform apparatuses, methods and systems

The Seed Splitting and Firmware Extension for Secure Cryptocurrency Key Backup, Restore, and Transaction Signing Platform Apparatuses, Methods and Systems ("SFTSP") transforms transaction signing request, key backup request, key recovery request inputs via SFTSP components into transaction signing response, key backup response, key recovery response outputs. An offline transaction signing request message for a transaction is received by a first cold HSM and includes an encrypted second master key share from a second cold HSM and an encrypted third master key share from a hot HSM. A first master key share is retrieved. The encrypted master key shares are decrypted and, along with the first master key share, used to recover a master private key. A keychain path is determined. A signing private key for the keychain path is generated using the master private key. The transaction is signed using the signing private key, and the generated signature is returned.