Hidden wallet discovered — institutional custody (2025)

Constrained

Case description

A 2025 Bitcoin custody service consolidation saw two mid-sized collaborative custody providers merge. During the merger integration period, customers of the acquired firm discovered that their multisig key configurations were temporarily suspended while the acquiring firm's systems were updated to support the legacy signing formats. Customers retained access to their wallets through their own keys but could not use the acquired firm's server key for co-signing during the migration window. The disruption lasted approximately three weeks, during which large transactions that required the server key's co-signature could not be executed.

Custody context

Stress condition	Multisig quorum failure
Custody system	Institutional custody
Outcome	Constrained
Documentation	Unknown
Year observed	2025
Country	International

Structural dependencies observed

Institutional cooperation requiredMulti-party coordination

What this illustrates

Getting access back required help from an institution — and that help wasn't available. Whether full access was ultimately possible is unclear, but significant delay or outside intervention was involved.

Outcome interpretation

Access remained possible, but only with delay, dependence, or significant difficulty.

Source

Publicly Reported

Evidence type

News article

Evidence link

https://anthonyspark.com/estate-planning-for-bitcoin/

Related cases involving multisig quorum failure

77 cases involve multisig quorum failure 10 cases involve institutional custody 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

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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.