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Fail - Unable to verify

See original GitHub issue

I’m having the old-and-familiar issue with verification. The contract was compiled and deployed.

The deployed contract can be found at 0x35c850e8c31fab411dde65f94142f25029229a75

CBToken.sol

pragma solidity ^0.5.0;

import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Mintable.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Pausable.sol";

contract CBToken is Ownable, ERC20Mintable, ERC20Pausable, ERC20Detailed {
    constructor(string memory _name, 
                string memory _symbol, 
                uint8 _decimals)
        ERC20Detailed(_name, _symbol, _decimals)
        public
    {
    }
}

package.json

{
  "name": "marketplace",
  "version": "1.0.1",
  "description": "online marketplace, crowdsale and token control",
  "scripts": {
    "lint": "eslint ./",
    "test": "mocha",
    "build": "rimraf public && webpack -p --config webpack.production.config.js",
    "dev": "concurrently --kill-others \"webpack-dev-server\" \"node .\\server\\server.js dev build\"",
    "server": "node server/server.js"
  },
  "author": "RENESALIS DOO",
  "license": "MIT",
  "devDependencies": {
    "chai": "^4.2.0",
    "chai-as-promised": "^7.1.1",
    "concurrently": "^4.1.0",
    "eslint": "^3.14.0",
    "eslint-config-standard": "^6.0.0",
    "eslint-plugin-babel": "^4.0.0",
    "eslint-plugin-promise": "^3.0.0",
    "eslint-plugin-standard": "^2.0.0",
    "webpack-dev-server": "^3.1.14",
    "openzeppelin-solidity": "2.1.2",
    "openzeppelin-test-helpers": "^0.1.2",
    "truffle-hdwallet-provider": "^1.0.0-web3one.3"
  },
  "dependencies": {
    "@babel/cli": "^7.2.3",
    "@babel/core": "^7.2.2",
    "@babel/plugin-transform-runtime": "^7.2.0",
    "@babel/polyfill": "^7.2.5",
    "@babel/preset-env": "^7.3.1",
    "@babel/register": "^7.0.0",
    "@babel/runtime": "^7.3.1",
    "@poanet/solidity-flattener": "^3.0.6",
    "babel-eslint": "^10.0.1",
    "babel-loader": "^8.0.5",
    "copy-webpack-plugin": "^4.6.0",
    "css-loader": "^2.0.1",
    "express": "4.16.4",
    "ipfs-mini": "^1.1.2",
    "log-timestamp": "^0.3.0",
    "mocha": "^5.2.0",
    "mongoose": "^5.4.6",
    "morgan": "^1.9.1",
    "rc": "^1.2.8",
    "scrypt": "github:barrysteyn/node-scrypt#fb60a8d3c158fe115a624b5ffa7480f3a24b03fb",
    "style-loader": "^0.13.1",
    "truffle-contract": "^4.0.4",
    "truffle-plugin-verify": "^0.4.0",
    "web3": "1.0.0-beta.37",
    "webpack": "^4.29.3",
    "webpack-cli": "^3.2.3"
  }
}

deploy.js

const Token = artifacts.require("./CBToken.sol");

async function doDeploy(deployer, network, accounts) {
  const _name     = "Demblock-Marketplace-TGE";
  const _symbol   = "dbto1";
  const _decimals = 18;
  await deployer.deploy(Token, _name, _symbol, _decimals);
}

module.exports = (deployer, network, accounts) => {
  deployer.then(async () => await doDeploy(deployer, network, accounts));
};

truffle-config.js

// Includes
require("@babel/register");
const path = require("path");
const WalletProvider = require("truffle-hdwallet-provider");
const HTTP_WEB3_PATH = require("./configs/params").dapp.HTTP_WEB3_PATH;

/// Key configs
let MAINNET_PROVIDER = new WalletProvider(
    [process.env.PRIVATE_KEYS || ""],
    HTTP_WEB3_PATH
);

/// Configs export
module.exports = {
    contracts_build_directory: path.join(process.cwd(), "src/"),
    networks: {
        mainnet: {
            provider: MAINNET_PROVIDER,
            gasPrice: 10000000000,
            gas: 3600000,
            network_id: 1
        }
    },
    compilers: {
        solc: {
            version: "^0.5.0", # deployed via 0.5.2+commit.1df8f40c.Emscripten.clang
        },
    },
    plugins: [
        'truffle-plugin-verify'
    ],
    api_keys: {
        etherscan: '########'
    }
};