Multisig quorum failure — institutional custody (2025)

Constrained

Case description

A 2025 case involved a Unchained Capital vault customer whose co-signing arrangement required periodic identity re-verification. After an extended period of non-engagement, Unchained suspended the customer's account pending reverification—a process that required government ID confirmation and a live video call with the compliance team. The customer was in a remote region with limited connectivity and was unable to complete the video verification for approximately six weeks. During this period, they retained access to their wallet through their own two keys (which reached quorum in the 2-of-3 arrangement) but could not use Unchained's server key if needed. The situation resolved when connectivity was restored.

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.