Perhaps the most straightforward example of a post-Bitcoin service using Satoshi’s blockchain is Proof of Existence. Created by Manuel Araoz, a 25-year-old developer in Argentina, the site allows you to upload a file to certify that you had custody of it at a given time. Neither its contents nor your own personal information are ever revealed — rather, all the data in the document gets digested into an encrypted number. Proof of Existence is built on top of the Bitcoin blockchain (there’s a 0.005 BTC fee), so the thousands of computers on that network have now collectively verified your file… CONTINUE
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