Implementation Bugs, Not Just Exploits, Threaten Custody
Cryptographic implementation errors in wallets and signers (biased nonces, reused randomness, faulty derivation) keep surfacing as a distinct custody risk alongside smart-contract exploits, eroding the assumption that certified hardware protects keys.
forming · confidence 40 · Emerging (watchlist) · tracking since July 25, 2026 · updated July 25, 2026
Why the conviction moved
- Jul 25Strengthened +6
Zilliqa halted native transfers after a biased signing nonce in its Ledger app let attackers rebuild private keys from ~5 signatures via lattice reduction, with exploitation starting July 19 (edition report). A live, actively-exploited nonce-bias bug in certified hardware directly validates that implementation errors, not just contract exploits, are a distinct custody risk.
Source trail
Supporting · July 25, 2026
Zilliqa Halts Native Transfers After a Seven-Year Ledger Flaw Lets Attackers Rebuild Private Keys
Zilliqa halted native transfers after a biased signing nonce in its Ledger app let attackers rebuild private keys from ~5 signatures via lattice reduction, with exploitation starting July 19 (edition report). A live, actively-exploited nonce-bias bug in certified hardware directly validates that implementation errors, not just contract exploits, are a distinct custody risk.
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