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this post was submitted on 11 Sep 2023
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Basically you have a bitcoin account. That account has a username and a password. You can share the username to have people send money to your account. However you can only send money yourself if you know the password to the account. He had his only copy of the password on the hard drive. So if you make two copies of one, you just have two copies of the password to the same account.
What's so special about it is that it's not centralised. With maths you can generate a declaration using your password to attach to your username saying you are sending money and that everyone should update their records. These cannot be faked without a password.
A lot of cryptography and maths goes into it. And the passwords are long strings of random letters and numbers that you cannot choose, same with the username.