medium
Other
Advisory: refund race condition in adaptor-signature swaps; 0.66 BTC reported lost
The public event log of the directory kycnot.me recorded that on 14 July 2026 the BasicSwap team published an advisory asking users to halt trading over a race condition in the automatic refund path of adaptor-signature swaps. A counterparty running a modified client could take swap funds before a refund was broadcast. The team reported a total loss of 0.66 BTC, about $42,000, and released version 0.17.2 with a fix. Ordinary completed swaps were not affected.
Funds lost $42K Source: kycnot.me ↗