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1C Signatures

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Shannon Appelcline 2017-02-24 16:21:23 -08:00 committed by GitHub
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3_Playing_with_Bitcoin.md
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@ -307,4 +307,20 @@ Usually you would not want to share this with anyone!
### Sign a Message ### Sign a Message
Alternatively, you can just directly sign a message using your address (and your bitcoind) without saving the private key. You do with with "bitcoin-cli signmessage [address] [message]". For example:
```
$ bitcoin-cli signmessage $NEW_ADDRESS_1 "Hello, World"
HzF7EWicHjDBf9faRTF5O7Q1+iSOunAYyV2880Yz0T/eaUELCukg2hGlJXj9/kptMBu2wf4DEuS8fnoq2QpvSo8=
```
This verifies that the message for the address was signed by the person who knew the address' private key. A recipient can verify it:
```
$ bitcoin-cli verifymessage $NEW_ADDRESS_1 "HzF7EWicHjDBf9faRTF5O7Q1+iSOunAYyV2880Yz0T/eaUELCukg2hGlJXj9/kptMBu2wf4DEuS8fnoq2QpvSo8=" "Hello, World"
true
```
If some black hat was making up signatures, they'd instead get a negative result:
```
$ bitcoin-cli verifymessage $NEW_ADDRESS_1 "FAKEEWicHjDBf9faRTF5O7Q1+iSOunAYyV2880Yz0T/eaUELCukg2hGlJXj9/kptMBu2wf4DEuS8fnoq2QpvSo8=" "Hello, World"
false
```