Bitcoin Proof of Reserves: How to Verify That Exchanges Actually Have the BTC They Claim
Bitcoin Proof of Reserves: How to Verify That Exchanges Actually Have the BTC They Claim
After FTX, Mt. Gox, QuadrigaCX, and dozens of exchange collapses, the question of whether exchanges actually hold the Bitcoin they claim has become critical. Proof of Reserves is a methodology for verifying exchange holdings. Understanding it reveals both its power and its limitations.
The Exchange Problem
Exchanges have historically operated on full-reserve faith:
The promise: “Your BTC is safely held.” Exchanges claimed to hold 1:1 reserves. Most didn’t.
The reality: Exchanges routinely commingled customer funds, lent out Bitcoin, or simply didn’t hold what they claimed. FTX used customer funds for Alameda Research’s trading.
The victims: Customers who lost everything. Even those who “should have known better” — FTX had the best reputation in the industry before collapse.
The lesson: Trusting exchanges is foolish. Verification is required.
What Proof of Reserves Actually Means
Proof of Reserves (PoR) is a cryptographic method to verify exchange holdings:
