Part of the CustodyStress archive of observed Bitcoin custody incidents
CS-01277
Seed unavailable — Coldcard (2024)
SurvivesCase description
A recovery case in early 2024 involved a Coldcard hardware wallet whose seed phrase had been stored as a cryptic reference in the holder's email—not the phrase itself but a clue pointing to a phrase derivable from a personal memory technique. After three years of disuse, the holder could not decode their own clue. A recovery specialist worked with the holder over several sessions to reconstruct the memory system and test derived seed phrases. The correct phrase was identified after testing approximately 200 variants of the remembered system. The case illustrated the risk of relying on non-standard mnemonic techniques for long-term seed storage.
Custody context
| Stress condition | Seed phrase unavailable |
| Custody system | Hardware wallet (single key) |
| Outcome | Survives |
| Documentation | Unknown |
| Year observed | 2024 |
| Country | International |
Structural dependencies observed
Outcome interpretation
Access remained possible under the reported conditions.
Source
Privately Reported
Evidence type
News article
Related cases involving seed phrase unavailable
146 cases involve seed phrase unavailable
274 cases involve hardware wallet (single key)
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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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