Broken Proofs of Solvency in Blockchain Custodial Wallets and Exchanges


Since the Mt. Gox Bitcoin exchange collapse in 2014, a number of custodial cryptocurrency wallets offer a form of financial solvency proofs to bolster their users' confidence. We identified that despite recent academic works that highlight potential security and privacy vulnerabilities in popular auditability protocols, a number of high-profile exchanges implement these proofs incorrectly, thus defeating their initial purpose. In this paper we provide an overview of broken liability proof systems used in production today and suggest fixes, in the hope of closing the gap between theory and practice. Surprisingly, many of these exploitable attacks are due to a) weak cryptographic operations, for instance SHA1 hashing or hash-output truncation to 8 bytes, b) lack of data binding, such as wrong Merkle tree inputs and misuse of public bulletin boards, and c) lack of user-ID uniqueness guarantees.

On IACR eprint
Yan Ji
Yan Ji
PhD student in Computer Science

My research interests span blockchains, security and privacy, applied cryptography and distributed systems.