4 ms·
They can undo previous transactions / blocks, but it takes a lot of work (the older the block the more work it takes). For recent transactions (last block) it m
by xiphias2 5y ago
They can undo previous transactions / blocks, but it takes a lot of work (the older the block the more work it takes). For recent transactions (last block) it may be practical, that's why 6 confirmations are advised for high value transfers.