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The assignment looks good, left a feedback comment
| pub_key_y[i] = pub_key[i+32]; | ||
| } | ||
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| let address: Field = ecrecover::ecrecover(pub_key_x, pub_key_y, signature, hashed_message); |
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You can also use from_unified for key conversion like this:
let key = ecrecover::secp256k1::PubKey::from_unified(pub_key);
let address = ecrecover::ecrecover(key.pub_x, key.pub_y, signature, hashed_message);
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