Coldcard-linked Bitcoin sweeps intensify; losses near $114M after fourth wave
AI Market Summary
A fourth wave of sweeps targeting Coldcard-generated Bitcoin addresses has reportedly lifted total losses to ~1,816 BTC (~$114M) across 5,200+ addresses, reinforcing acute self-custody and wallet-supply-chain risk. The attacker's use of replace-by-fee creates a narrow window for some victims to outbid pending sweeps, but the episode can pressure near-term risk sentiment and increase urgency around UTXO hygiene and wallet migration.
Impact level
● High
Affected assets
BTC/USDT+0.90%
AI Insight · BTC/USDTAI Insight
▼ Bearish
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A fourth round of sweeps targeting Bitcoin addresses generated by Coldcard ran on Monday, according to Galaxy Research analyst Alex Thorn (@intangiblecoins). Thorn reported about 449 BTC taken from 709 addresses believed to belong to victims.
The latest activity brings estimated losses since July 30 to roughly 1,816 BTC—about $114 million—spanning more than 5,200 addresses.
In an unusual twist, the attacker enabled replace-by-fee (RBF). That leaves a narrow window for victims with still-unconfirmed transactions to submit a higher-fee transaction and move funds before the sweep confirms. Thorn urged affected users to migrate funds immediately using high fees.
