Passphrase unavailable — desktop software wallet (2023)

Survives

Case description

A Blockchain.com wallet user from the early v1 era contacted KeychainX in 2023 unable to recall the secondary wallet password set eight years prior. The v1 Blockchain wallet format uses a non-standard password hashing method (mode 12700 in Hashcat) that contains a known bug preventing standard tools from finding correct passwords. The user needed specialist recovery tools specifically adapted for the vintage format. After specialist intervention using modified tooling, the wallet was accessed. The case illustrated that early wallet software had idiosyncratic encryption that required format-specific knowledge rather than generic brute-force approaches.

Custody context

Stress condition	Passphrase unavailable
Custody system	Desktop Software Wallet
Outcome	Survives
Documentation	Unknown
Year observed	2023
Country	International

Structural dependencies observed

Technical specialist required

Outcome interpretation

Access remained possible under the reported conditions.

Source

Privately Reported

Evidence type

News article

Evidence link

https://keychainx.medium.com/how-to-recover-lost-bitcoin-passwords-c34c42ee6f17

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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.