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Re:What Is Bitcoin? A Step-By-Step Guide for Beginners by vbezhenar on Monday December 05, 2016 @10:21AM (#13105849)
Why would all bitcoins be lost? Even if only one bitcoin left, you can divide it in billions of pieces. And when you've lost every piece but one, you can further divide it. It won't be lost forever, not until our universe will die, and long before that we probably will be able to break SHA-1 and mine lost bitcoins back.
Re:What Is Bitcoin? A Step-By-Step Guide for Beginners by tromp on Monday December 05, 2016 @01:01PM (#13107563)
> mine lost bitcoins back

Mining can only produce new bitcoins. To recover lost ones, you'd need to break elliptic curve signatures (and possibly RIPEMD160/SHA256 to recover a full public key from a non-spent address).

Re:What Is Bitcoin? A Step-By-Step Guide for Beginners by arik-so on Monday December 05, 2016 @12:41PM (#13107348)
Just to be pedantic: Bitcoin uses sha256, and not sha1.