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Man Buys $27 Of Bitcoin, Forgets About Them, Finds They're Now Worth $886k | Technology | Theguardian.com
How the blockchain secures Bitcoin
They are doing cryptographic hashes called SHA-256 (look it up). A hash can't be decoded, it can only be brute force matched. What all the miners are doing are computing hashes, which are entered in the blockchain (ledger) when the hash meets a certain criteria. The criteria…