_Follow along with the video lesson:_ --- ### Signatures Recap Alright! We've just learnt a tonne about signatures and message verification. Let's recap a few important points briefly. ### Signing 1. Take a private key + message - The message is generally comprised of: data, function selectors, parameters etc 2. Pass both the private key + message into the [**Elliptic Curve Digital Signature Algorithm**](https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm) (ECDSA) - We don't dive deep into ECDSA, but I recommend you do - outputs `v, r, and s` 3. `v, r, and s` are used to verify someone's signature using the precompile `ecrecover`. ### Verifying 1. Take signed message - Break into `v, r, and s` using `ECDSA` 2. Take message `data` 3. Pass message `data` and `v, r, and s` to `ecrecover`. - `ecrecover` outputs the address which signed the message - Compare this vs your expected address to verify