A Study on Multi signature for Blockchains

Abstract

We suggest a research of authentication techniques in the Bitcoin ecosystem as a blockchain application in this article. First, from the standpoint of replacing the current banking system, the features provided by Bitcoin and its security requirements are studied. The blockchain use case of the Bitcoin ecosystem has current transaction authentication techniques that have been well researched in the literature. The topic of whether the common account and proxy notions of banking services are likewise feasible in Bitcoin is posed in light of this. According to many experts, there are solutions based on responsible subgroup multi-signature schemes and bilinear pairings. In this work, the aforementioned question is addressed using the aforementioned scheme. We have the chance to use the public key aggregation process with accountable subgroup multi-signature (ASM), which is built from Boneh, Lynn, and Shacham (BLS) signature schemes. This makes it possible for multiple users to jointly sign the same message, and only one public key is required to validate the signature. This method is quite easy to implement in Bitcoin and provides for significant cost savings when it comes to storing public keys in transaction scripts. Our methods can be applied in many other situations where multiple signatures are required, in addition to reducing the size of the Bitcoin blockchain. Both signature compression and public-key aggregation are supported by all of our constructions. Therefore, the verifier simply needs a brief multisignature, a brief aggregation of the public keys of the parties, and the message m to confirm that several parties signed a shared message m. Future scope of proposed research is that it could be applicable any other blockchain structure where multi- signature is to be used.