Crypto Exchanges' Proof-of-Reserves Fall Short in Proving Solvency

Four years after FTX's collapse, crypto exchanges have made significant strides in publishing proof of reserves, but this approach still falls short in proving solvency. The process involves demonstrating control over specified assets at a particular moment, which can be achieved through cryptographic evidence such as Merkle trees and zero-knowledge proofs.

Major platforms like Binance, OKX, Kraken, and Crypto.com have implemented different versions of this process, but they all share the same limitations. The dataset used to create the proof of reserves is often a snapshot of assets at a particular time, which may not reflect the company's normal position or its ability to meet customer demands.

The problem lies in the fact that liabilities are recorded across internal databases, bank accounts, contracts, and corporate ledgers, making it difficult for outsiders to gain visibility into an exchange's financial condition. A dashboard showing $10 billion in crypto assets provides no comprehensive account of whether the exchange owes $8 billion, $10 billion, or $15 billion.

The Public Company Accounting Oversight Board has warned investors that proof-of-reserve reports vary widely and may provide an inadequate basis for deciding whether a company has enough assets to meet its obligations. This is because these reports often fall outside of audit oversight and do not examine the full financial condition of the company, including corporate debt, internal controls, related parties, litigation, and the ability to remain in business.