blocks? like the block found by the miners?
For bitcoin the most important thing is that the SHA256 hash of the block meet the mining difficulty criteria, e.g. with enough number of "0" at the beginning of the hash.
different crypto currency of course will has different criteria. But they could use the same criteria as bitcoin.
yes like the block found by the miner... so if the rig finds a block and it's being rejected, could it be because the difficulty change while the rig was working on a previous block, so when it's being submitted it gets rejected because it doesn't meet the difficulty criteria anymore ?
Does this logic makes sense ?