Enhancing privacy in commit-chains based on blind signature

Abstract

Since responding to users’ needs, and also executing their transactions in public blockchains is very slow compared to the existing banking solutions, various methods have been presented with the purpose of increasing scalability in the recent years. One of these methods is commit-chain, in which transactions are done quickly and cheaply with the help of the commit-chain operator. But on the other hand, the privacy of users is reduced in this method.The main goal of this paper is to provide a solution for increasing users’ privacy in commit-chain via blind signature. Due to the necessity of the presence and the help of the operator in all transactions in commit-chain, In cases where the operator does not provide a suitable service, the user would be forced to leave the commit-chain. In the proposed solution, users can perform their transactions anonymously and almost without the help of the operator.To this end, some tokens are employed which can be used in all commit-chains formed on the same blockchain and can provide the possibility of disconnecting or reducing the connection between the user and the operator. Due to the use of blind signature in the structure of these tokens, users can perform all or some of their transactions anonymously in the commit-chain and protect their privacy.