Zilliqa points to hardware wallet flaw discarding entropy to expose crypto keys, enabling 683M ZIL theft

A recent Zilliqa Ledger bug exposed at least 6,772 accounts, according to the post-mortem, and enabled the theft of 683,130,969.66 ZIL across 66 successful attack-window transactions. The disclosure turned an earlier unquantified security flaw into a measured loss and exposure record while, as of the same date, legacy transactions remained paused and holders faced an undated migration to Zilliqa EVM.The figures measure different parts of the incident. Zilliqa separates 51 drained accounts from the 6,772 accounts whose private keys were shown to be exposed. The post-mortem leaves the number of affected people unquantified.The exposed-account total is a floor. The 683.13 million ZIL total is exact for the compromised accounts currently known, according to the post-mortem, and it could rise if investigators prove that additional compromised accounts produced theft transactions.Why four signatures matterZilliqa said the application generated 40 random bytes but copied the wrong 32 bytes into its signing buffer, retaining eight bytes of zero padding and discarding eight bytes of entropy. That forced the high 64 bits of every affected nonce to zero.Four or more biased signatures produced...