#ColdcardExploitAttackersControl1366BTC We mapped the flow of funds for the Coldcard vulnerability based on the pattern identified by engineers at Block and shared by @clay_garrett
1,196 addresses drained in full for 1,082.65 BTC (~$70.2M) between 01:10:20 and 01:51:26 UTC on Jul 30 — a 41-minute window, blocks 960,183-960,191. That preceded the hardware-wallet vendor's public advisory by ~30 hours.
Signature: every sweep paid an identical hardcoded 30.0 sat/vB — a 30-75x overpay vs the 0.4-1.0 sat/vB median that week — and left no change output. That looks like an automated tool spending keys it already held, not owners moving funds. Victims: 1,183 native segwit (BIP-84), 7 BIP-49, 6 BIP-44 — consistent with multi-path key scanning.
Proceeds consolidated within minutes and have NOT moved since:
- bc1qq85v2c9...cu9r — 562.02 BTC
- bc1qx76cae2...fhe3 — 398.48 BTC
- bc1q8jy96fe...tp3q — 89.62 BTC
- bc1qnk4zh9q...fecp0 — 32.45 BTC (unmoved)$BTC
1,196 addresses drained in full for 1,082.65 BTC (~$70.2M) between 01:10:20 and 01:51:26 UTC on Jul 30 — a 41-minute window, blocks 960,183-960,191. That preceded the hardware-wallet vendor's public advisory by ~30 hours.
Signature: every sweep paid an identical hardcoded 30.0 sat/vB — a 30-75x overpay vs the 0.4-1.0 sat/vB median that week — and left no change output. That looks like an automated tool spending keys it already held, not owners moving funds. Victims: 1,183 native segwit (BIP-84), 7 BIP-49, 6 BIP-44 — consistent with multi-path key scanning.
Proceeds consolidated within minutes and have NOT moved since:
- bc1qq85v2c9...cu9r — 562.02 BTC
- bc1qx76cae2...fhe3 — 398.48 BTC
- bc1q8jy96fe...tp3q — 89.62 BTC
- bc1qnk4zh9q...fecp0 — 32.45 BTC (unmoved)$BTC