remcoros on Nostr: testnet3 and 4 have a rule: when the 'nTime' of a block is larger then the nTime of ...
testnet3 and 4 have a rule: when the 'nTime' of a block is larger then the nTime of the last block + 20 minutes, the difficulty drops to 1. This means that anyone (cpu/gpu/asic) can easily mine it, because the difficulty is 1.
So you can construct a block with a 'fake' nTime in the future (at least 20 minutes more then the last block), and instantly mine it.
There is a limit to this (else you can keep moving nTime more and more in the future).
The limit is another rule: nTime of block cannot be later then last block + 2 hours.
So it's possible to always mine 5 blocks into the future. This is being done a lot on testnet (because it's an easy way to get some coins without waiting to actually mine it).
So you can construct a block with a 'fake' nTime in the future (at least 20 minutes more then the last block), and instantly mine it.
There is a limit to this (else you can keep moving nTime more and more in the future).
The limit is another rule: nTime of block cannot be later then last block + 2 hours.
So it's possible to always mine 5 blocks into the future. This is being done a lot on testnet (because it's an easy way to get some coins without waiting to actually mine it).