Part of the CustodyStress archive of observed Bitcoin custody incidents
CS-00451
The attacker used the SIM swap to bypass 2FA on the victim's exchange account
BlockedCase description
An August 2017 documented incident describes a Bitcoin holder SIM-swapped by an attacker who had obtained their phone number from an exchange data breach. The attacker used the SIM swap to bypass 2FA on the victim's exchange account and transferred 3.5 BTC before the victim could contact the carrier to block the swap.
Custody context
| Stress condition | Physical coercion |
| Custody system | Mobile or software wallet |
| Outcome | Blocked |
| Documentation | Unknown |
| Year observed | 2017 |
| Country | Unknown |
Structural dependencies observed
What this illustrates
There was only one way in. When that path was gone, so was access. Access was not recoverable.
Outcome interpretation
Access was not possible under the reported conditions.
Source
Publicly Reported
Evidence type
Forum post
Evidence link
Related cases involving physical coercion
105 cases involve physical coercion
572 cases involve mobile or software wallet
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This archive documents observed custody survivability failures. It does not attempt to document all Bitcoin losses or security incidents.
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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.
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