By 2018 they had forgotten the calendar system's conversion rules.

Blocked

Case description

A June 2018 forum case describes a user who had encoded their passphrase as a series of dates in an unusual calendar system they had been studying at the time. By 2018 they had forgotten the calendar system's conversion rules. The dates alone were insufficient without the conversion algorithm.

Custody context

Stress condition	Passphrase unavailable
Custody system	Mobile or software wallet
Outcome	Blocked
Documentation	Unknown
Year observed	2018
Country	Unknown

Structural dependencies observed

Single point of failure

What this illustrates

The seed phrase was there, but the passphrase that unlocked it was gone. Both are required. Access was not recoverable.

Outcome interpretation

Access was not possible under the reported conditions.

Source

Publicly Reported

Evidence type

Forum post

Evidence link

https://bitcointalk.org/index.php?topic=255793.0

Related cases involving passphrase unavailable

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This archive documents observed custody survivability failures. It does not attempt to document all Bitcoin losses or security incidents. Submit a case

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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.