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Tutorial by Datagram A physical Bitcoin is a combination of elements meant for long-term preservation and storage of a private key. They’re comprised of a metal coin, a paper that includes the public key that can be used to verify the balance of a Bitcoin wallet, the private key to retrieve that balance, and an adhesive tamper-evident seal to shield the private key from prying eyes. In theory, any attempt to reveal the private key would evidence tampering of the seal. Like most products that use a tamper-evident seal, “Physical Bitcoins by Casascius" boast:”It’s pretty difficult to remove the hologram...

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