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In ECDSA, the message is never encoded as a point in the elliptic curve. Signing in ECDSA loosely works like this: $$ \begin{align*} k &= \text{random}(0, n) \\ (x, \_) &= k \cdot G \\ r &= x \bmod n \\ s &= k^{-1}(H(m) + r \alpha) \bmod n \end{align*} $$ $r$ and $s$ are the signature, and as you can see $H(m)$ is only ever used as an ...

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