MCP Crypto Wallet EVM

Instructions

Implementation Reference

• src/handlers/wallet.ts:441-463 (handler)

  The main handler function that implements the wallet_verify_message tool. It uses ethers.utils.verifyMessage to recover the signer address from the message and signature, then checks if it matches the provided address.

  export const verifyMessageHandler = async (input: any): Promise<ToolResultSchema> => {
    try {
      if (!input.message || !input.signature || !input.address) {
        return createErrorResponse("Message, signature, and address are required");
      }
  
      const recoveredAddress = ethers.utils.verifyMessage(input.message, input.signature);
      const isValid = recoveredAddress.toLowerCase() === input.address.toLowerCase();
  
      return createSuccessResponse(
      isValid ? `Signature verified successfully
        Message: "${input.message}"
        Signature: ${input.signature}
        Address: ${input.address}
      ` : `Signature verification failed
        Message: "${input.message}"
        Signature: ${input.signature}
        Address: ${input.address}
      `);
    } catch (error) {
      return createErrorResponse(`Failed to verify message: ${(error as Error).message}`);
    }
  };

• src/tools.ts:361-373 (schema)

  Input schema for the wallet_verify_message tool, defining the required parameters: message, signature, and address.

  {
    name: "wallet_verify_message",
    description: "Verify a signed message",
    inputSchema: {
      type: "object",
      properties: {
        message: { type: "string", description: "The original message" },
        signature: { type: "string", description: "The signature to verify" },
        address: { type: "string", description: "The address that supposedly signed the message" }
      },
      required: ["message", "signature", "address"]
    }
  },

• src/tools.ts:586-586 (registration)

  Maps the tool name 'wallet_verify_message' to its handler function verifyMessageHandler in the central handlers dictionary.

  "wallet_verify_message": verifyMessageHandler,