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Jun 5, 2018 at 8:56 comment added luca590 Okay, I think your comment answered the question, thanks
Jun 5, 2018 at 8:55 vote accept luca590
Jan 12, 2018 at 14:47 comment added Ismael @luca590 When you send the transaction you also send a proof of which block includes it, the contract has the blocks headers and can verify the proof is correct. Search for SPV proof if you want to know more details about it.
Jan 12, 2018 at 6:04 comment added luca590 I'm not suggesting someone creates a fake block. Why can't they just lie to the contract, give it false information about the transactions. The contract doesn't have a way to directly verify with Bitcoin
Jan 7, 2018 at 6:53 history answered Ismael CC BY-SA 3.0