Interactive Incontestable Signature for Transactions Confirmation in Bitcoin Blockchain

Abstract

Blockchain is a radical innovation that has a significant impact on payments, stock exchanges, cybersecurity, and computational law. However, it has significant limitations regarding uncertainty for a transaction to be confirmed. This paper proposes a new system for exact confirmation of transactions in a block. Replacing original signature, a new Interactive Incontestable Signature (IIS) scheme is used between dealer and owner to confirm a transaction. By this signature, the dealer can assure the owner that a transaction will be included into blockchain in a non-repudiation way. The scheme is proved to be secure for owner's unforgeability and dealer's incontestability.