2026 Balfour Beatty — CoinbaseCartel claim (May 29)
Data compromised
Unspecified engineering and corporate data per actor marketing
Technical writeup
BreachHistory cataloged May 29, 2026 CoinbaseCartel extortion marketing against Balfour Beatty (balfourbeatty.com), a UK infrastructure contractor. No company notice at catalog time.
Root cause
CoinbaseCartel extortion claim