Over a million of time-locked Bitcoin transactions between September 2019 and March 2020 were misconfigured. This bug made them vulnerable to hack attach with the aim to steal cryptocurrency. The bug affects 2% of all transactions in the Bitcoin network, according to a study berformed by the developer aka 0xb10c. Time-locked transactions prohibit the recipient from using bitcoins as soon as they are deposited. They have to wait until a certain condition is reached. For example, a timelock can be configured to expire when a certain number of blocks are added to the network, or at an approximate point in the future. ... (full story)