…sn't work" 2^31 milliseconds is only about 25 days. Also clamps Sleep() to 10 years, because it currently sleeps for 0 seconds when the sleep time would cross 2^31 seconds since the epoch. Hopefully boost will be fixed by 2028.
…olderPath Upstream commit: 21ae37d (partial)
Introduce the following network rule: * a block is not valid if it contains a transaction whose hash already exists in the block chain, unless all that transaction's outputs were already spent before said block. Warning: this is effectively a network rule change, with potential risk for forking the block chain. Leaving this unfixed carries the same risk however, for attackers that can cause a reorganisation in part of the network. Thanks to Russell O'Connor and Ben Reeves.
… the future (secs<0) Fixes #874.