feat: support verify block signature signed by RN

consensus/system_contract/consensus.go

@@ -2,6 +2,7 @@ package system_contract
 
 import (
 	"bytes"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"io"
@@ -136,6 +137,7 @@ func (s *SystemContract) verifyHeader(chain consensus.ChainHeaderReader, header
 	}
 	// Check that the BlockSignature contains signature if block is not requested
 	if header.Number.Cmp(big.NewInt(0)) != 0 && len(header.BlockSignature) != extraSeal {
+		log.Info("Morty: missing signature", "hash", header.Hash(), "signature", hex.EncodeToString(header.BlockSignature), "extra", hex.EncodeToString(header.Extra), "number", header.Number)
 		return errMissingSignature
 	}
 	// Ensure that the mix digest is zero
@@ -211,6 +213,7 @@ func (s *SystemContract) verifyCascadingFields(chain consensus.ChainHeaderReader
 	defer s.lock.RUnlock()
 
 	if signer != s.signerAddressL1 {
+		log.Info("Morty: ecrecover Unauthorized signer", "Got", signer, "Expected:", s.signerAddressL1)
 		log.Error("Unauthorized signer", "Got", signer, "Expected:", s.signerAddressL1)
 		return ErrUnauthorizedSigner
 	}
@@ -393,15 +396,25 @@ func SealHash(header *types.Header) (hash common.Hash) {
 // ecrecover extracts the Ethereum account address from a signed header.
 func ecrecover(header *types.Header) (common.Address, error) {
 	signature := header.BlockSignature[0:]
+	// Normalize recovery ID for compatibility with Scroll's reth node.
+	// Scroll's reth uses alloy signer which produces signatures with recovery ID (V) of 27/28,
+	// but Ethereum's standard crypto.Ecrecover expects V to be 0/1.
+	// Convert 27/28 format to 0/1 format by subtracting 27.
+	if signature[64] >= 27 && signature[64] <= 28 {
+		signature[64] -= 27
+	}
+
+	log.Info("Morty: ecrecover", "hash", header.Hash(), "signature", hex.EncodeToString(signature))
 
 	// Recover the public key and the Ethereum address
 	pubkey, err := crypto.Ecrecover(SealHash(header).Bytes(), signature)
 	if err != nil {
+		log.Info("Morty: failed to ecrecover", "hash", header.Hash(), "signature", hex.EncodeToString(signature), "error", err)
 		return common.Address{}, err
 	}
 	var signer common.Address
 	copy(signer[:], crypto.Keccak256(pubkey[1:])[12:])
-
+	log.Info("Morty: ecrecover", "hash", header.Hash(), "signer", signer.Hex())
 	return signer, nil
 }