CustodyStress
Archive › Seed phrase unavailable
Part of the CustodyStress archive of observed Bitcoin custody incidents
CS-01135

The device was operational and the PIN was known, but no seed phrase backup existed.

Indeterminate
Case description
A user who had purchased a hardware wallet in 2020 discovered in mid-2023 that the paper seed phrase backup they had stored had been discarded by a family member during a house move. The device was operational and the PIN was known, but no seed phrase backup existed. The user could transact normally while the device functioned but had no recovery path if the device failed. Retained a professional service to assess options; the service confirmed no recovery was possible without the seed phrase if the device was damaged or stolen.
Custody context
Stress conditionSeed phrase unavailable
Custody systemHardware wallet (single key)
OutcomeIndeterminate
DocumentationUnknown
Year observed2023
CountryInternational
Structural dependencies observed
Technical specialist required
What this illustrates
Recovery needed someone with specialized technical knowledge who wasn't available. It's not clear whether anyone ever regained access.
Outcome interpretation
Not enough information is available to determine the outcome.
Source
Privately Reported
Evidence type
News article
Evidence link
https://btcnewsanalysis.com/2022/08/16/how-a-trezor-wallet-passphrase-taking-a-lifetime-to-brute-force-was-cracked-by-keychainx/
Related cases involving seed phrase unavailable
The Coldcard's encrypted backup on the card was unreadable.
Hardware wallet (single key) · 2025 Constrained
A BIP39 brute-force specialist was able to narrow the search space using the 18 known
Hardware wallet (single key) · 2025 Survives
Seed phrase unavailable — hardware wallet — United States 2025
Hardware wallet (single key) · 2025 Constrained
146 cases involve seed phrase unavailable 274 cases involve hardware wallet (single key) View archive statistics →
This archive documents observed custody survivability failures. It does not attempt to document all Bitcoin losses or security incidents. Submit a case
← All cases
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.
Terms guide
Outcome terms
Survives
Access remained possible under the reported conditions.
Constrained
Access remained possible, but only with delay, dependence, or significant difficulty.
Blocked
Access was not possible under the reported conditions.
Indeterminate
There was not enough information to determine the outcome.
Structural terms
Single-person knowledge
Recovery depended on information or capability held by one individual who was unavailable.
Institutional dependence
Recovery depended on a third-party institution or service that was inaccessible or uncooperative.
Documentation gap
Recovery depended on instructions that were missing, incomplete, or unclear.
Authority mismatch
The person with legal authority to act did not have operational access, or vice versa.