Part of the CustodyStress archive of observed Bitcoin custody incidents
CS-01015
Exchanges including Kraken, Binance, and OKX published Merkle-tree-based reserve proofs.
ConstrainedCase description
Following the wave of exchange insolvencies in 2022, several surviving centralized exchanges introduced proof-of-reserves audits in Q4 2022 in response to customer demand. Exchanges including Kraken, Binance, and OKX published Merkle-tree-based reserve proofs. This episode illustrated how the absence of such documentation had been a hidden custody risk: customers on Celsius, Voyager, and FTX had no mechanism to verify pre-collapse that their assets were actually held. Documentation-absent custody arrangements had been normalized across the industry.
Custody context
| Stress condition | Vendor lockout |
| Custody system | Exchange custody |
| Outcome | Constrained |
| Documentation | Unknown |
| Year observed | 2022 |
| Country | International |
Structural dependencies observed
What this illustrates
Nobody had written down how to get back in. That knowledge existed only in the owner's head. Whether full access was ultimately possible is unclear, but significant delay or outside intervention was involved.
Outcome interpretation
Access remained possible, but only with delay, dependence, or significant difficulty.
Source
Publicly Reported
Evidence type
News article
Related cases involving vendor lockout
This archive documents observed custody survivability failures. It does not attempt to document all Bitcoin losses or security incidents.
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Framework references
Where Bitcoin Custody Intersects Legal and Fiduciary Authority
Where custody creates gaps in estate planning, fiduciary duty, and professional responsibility.
Professional Scope Boundary Matrix
What each professional or product covers, what they do not, and where gaps form between them.
The Independent Assessment Layer in Bitcoin Custody
How independent diagnostic layers emerge when multiple parties depend on shared infrastructure.
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