Crypto Exchanges' Proof of Reserves Systems: A Limited Guarantee

Crypto exchanges have been implementing 'proof of reserves' systems to reassure customers about their assets. This involves using cryptographic techniques, such as Merkle trees and zero-knowledge proofs, to demonstrate control over specified assets at a particular moment.

However, this does not necessarily prove the exchange's solvency or ability to meet its obligations. A determination of solvency requires a deeper and wider view of the company's obligations, ownership structure, and access to funds.

Major platforms have implemented different versions of proof of reserves systems. Binance provides a reserve dashboard and customer verification, while OKX publishes wallet information and downloadable proof files. Kraken offers account-level verification for covered balances, and Crypto.com provides a Merkle-based verification interface.

The Public Company Accounting Oversight Board has warned investors that proof-of-reserve reports vary widely because they fall outside its audit oversight, and may provide an inadequate basis for deciding whether a company has enough assets to meet its obligations.