Part of the CustodyStress archive of observed Bitcoin custody incidents
CS-01299
The original holder died in 2024.
SurvivesCase description
A recurring pattern documented by recovery firms in 2024 involved early Bitcoin holders who had stored a seed phrase by splitting it—giving some words to family members, storing others separately. The original holder died in 2024. The family succeeded in assembling all portions of the seed phrase but discovered that different family members had recorded different numbers of words, and when combined the total was 11 words rather than 12. The missing 12th word was a BIP39 checksum word that could be systematically recovered: there were 128 possible valid 12th words. A recovery service tested all possibilities and identified the correct combination.
Custody context
| Stress condition | Documentation absent |
| 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 documentation absent
193 cases involve documentation absent
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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