Multi-Shard Private Transactions for Permissioned Blockchains

TL;DR

This paper introduces the MSPT protocol, a privacy-preserving method for permissioned blockchains that uses simple cryptography and targeted information sharing to enhance privacy and performance.

Contribution

The MSPT protocol is a novel approach that improves privacy and efficiency in permissioned blockchains without relying on complex cryptographic techniques.

Findings

Achieves atomicity in private transactions

Uses only simple cryptographic primitives

Provides high performance in permissioned blockchains

Abstract

Traditionally, blockchain systems involve sharing transaction information across all blockchain network participants. Clearly, this introduces barriers to the adoption of the technology by the enterprise world, where preserving the privacy of the business data is a necessity. Previous efforts to bring privacy and blockchains together either still leak partial information, are restricted in their functionality or use costly mechanisms like zk-SNARKs. In this paper, we propose the Multi-Shard Private Transaction (MSPT) protocol, a novel privacy-preserving protocol for permissioned blockchains, which relies only on simple cryptographic primitives and targeted dissemination of information to achieve atomicity and high performances.