Managing ERC1155

As a SKALE Chain Owner, there are two main steps to managing ERC1155 through IMA:

One-time setup and map your ERC1155 tokens to your SKALE Chain
Transferring ERC1155 using IMA

Once you have completed step 1 to setup and map your ERC1155 tokens, you can then setup transfer flow to allow end-users to transfer ERC1155 tokens between Ethereum and your SKALE Chain.

Setup and Map ERC1155 Transfers

The following one-time setup for each ERC1155 token is required for SKALE Chains with a default access control policy (default settings are: whitelisting enabled, automatic deployment disabled). For more information on IMA access control, see here.

1. Review the token contract

First, review the Mainnet ERC1155 token implementation and (if needed) modify a SKALE Chain version of the contract to include Mintable and Burnable functions. These functions are required to dynamically mint and burn the token on the SKALE chain in response to deposit and exit on the Mainnet.

Example Mainnet contract

pragma solidity 0.6.12;

import "@openzeppelin/contracts-upgradeable/token/ERC1155/ERC1155Burnable.sol";

contract ERC1155OnChain is ERC1155Burnable {

    event MinterAdded(address indexed account);

    constructor(
        string memory uri
    )
        public
        ERC1155(uri)
    {
    }

    function mint(
        address account,
        uint256 id,
        uint256 amount,
        bytes memory data
    )
        public
    {
        _mint(account, id, amount, data);
    }

    function mintBatch(
        address account,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    )
        public
    {
        _mintBatch(account, ids, amounts, data);
    }

    function addMinter(address account) external {
        emit MinterAdded(account);
    }
}

Example Modified SKALE Chain contract

pragma solidity 0.6.12;

import "@openzeppelin/contracts-upgradeable/token/ERC1155/ERC1155Burnable.sol";

contract ERC1155OnChain is ERC1155Burnable {

    event MinterAdded(address indexed account);

    constructor(
        string memory uri
    )
        public
        ERC1155(uri)
    {
    }

    function mint(
        address account,
        uint256 id,
        uint256 amount,
        bytes memory data
    )
        public
    {
        _mint(account, id, amount, data);
    }

    function mintBatch(
        address account,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    )
        public
    {
        _mintBatch(account, ids, amounts, data);
    }

    function addMinter(address account) external {
        emit MinterAdded(account);
    }
}

If you aren’t using OpenZeppelin’s framework, then you can manually add Mintable and Burnable functions, and finally [add MINTER_ROLE access control](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.1/contracts/access/roles/MinterRole.sol). Be sure that the main mint and burn functions have public visibility with the private _mint and _burn functions as internal visibility.

For a set of examples for IMA SKALE-Chain side suitable tokens, see the IMA test-tokens folder.

2. Add a Minter Role

Now you need to add the pre-deployed TokenManagerERC1155 contact on your SKALE Chain as the MINTER_ROLE for the modified SKALE Chain contract. With OpenZeppelin’s framework, you simply need to execute an AddMinter transaction on the SKALE chain token contract.

Example Add Minter Role

Web3 JS

import Common from "ethereumjs-common";
const Tx = require("ethereumjs-tx").Transaction;
const Web3 = require("web3");

let schainABIs = "[YOUR_SKALE_CHAIN_ABIs]";
let schainERC1155ABI = "[YOUR_SCHAIN_ERC1155_ABI]";
let chainId = "[YOUR_SKALE_CHAIN_CHAIN_ID]";

const customCommon = Common.forCustomChain(
    "mainnet",
    {
      name: "skale-network",
      chainId: chainId
    },
    "istanbul"
  );

let contractOwnerPrivateKey = new Buffer("[YOUR_PRIVATE_KEY]", 'hex');

let contractOwnerAccount = "[CONTRACT_OWNER_ACCOUNT]"; // SKALE Chain owner or authorized deployer account

let schainEndpoint = "[YOUR_SKALE_CHAIN_ENDPOINT]";

const erc1155ABI = schainERC1155ABI.erc1155_abi;
const erc1155Address = schainERC1155ABI.erc1155_address;

const tokenManagerAddress = schainABIs.token_manager_erc1155_address;

const web3ForSchain = new Web3(schainEndpoint);

let schainERC1155Contract = new web3ForSchain.eth.Contract(
    erc1155ABI,
    erc1155Address
);

let addMinter = schainERC1155Contract.methods
    .addMinter(tokenManagerAddress)
    .encodeABI();

  web3ForSchain.eth.getTransactionCount(contractOwnerAccount).then((nonce) => {
    //create raw transaction
    const rawTxAddMinter = {
      from: contractOwnerAccount,
      nonce: nonce,
      data: addMinter,
      to: erc1155Address,
      gasPrice: 100000000000,
      gas: 8000000
    };
    //sign transaction
    const txAddMinter = new Tx(rawTxAddMinter, { common: customCommon });
    txAddMinter.sign(contractOwnerPrivateKey);

    const serializedTxAddMinter = txAddMinter.serialize();

    //send signed transaction (add minter)
    web3ForSchain.eth
      .sendSignedTransaction("0x" + serializedTxAddMinter.toString("hex"))
      .on("receipt", (receipt) => {
        console.log(receipt);
      })
      .catch(console.error);
  });

3. Register Mainnet contract to IMA

Third, you need to register the Mainnet token contract into IMA on Mainnet using the addERC1155TokenByOwner method in the DepositBoxERC1155 contract:

IMA-JS
Web3 JS

In all ima-js code samples we’re assuming that library is already inited. See init instructions here. For the 2 objects usage drop ima. prefix.

// import & init ima-js here

export async function linkERC1155TokenMainnet(ima) {
  let schainName = "[YOUR_SKALE_CHAIN_NAME]";
  const erc1155OnMainnet = "[ADDRESS_OF_ERC1155_ON_MAINNET]";

  let address = "[YOUR_ADDRESS]";
  let privateKey = "[YOUR_PRIVATE_KEY]";

  let txOpts = {
    address: address,
    privateKey: privateKey // remove privateKey from txOpts to use Metamask signing
  };

  await mainnet.addERC1155TokenByOwner(schainName, erc1155OnMainnet, txOpts);
}

const Web3 = require("web3");
const Tx = require("ethereumjs-tx").Transaction;

let rinkebyABIs = "[YOUR_RINKEBY_ABIs]";
let rinkebyERC1155ABI = "[YOUR_RINKEBY_ERC1155_ABI]";

let privateKey = new Buffer("[YOUR_PRIVATE_KEY]", 'hex');

let erc1155OwnerForMainnet = "[YOUR_ERC1155_MAINNET_OWNER]";

let rinkeby = "[YOUR_RINKEBY_ENDPOINT]";
let schainName = "[YOUR_SKALE_CHAIN_NAME]";
let chainId = "[YOUR_RINKEBY_CHAIN_ID]";

const depositBoxAddress = rinkebyABIs.deposit_box_erc1155_address;
const depositBoxABI = rinkebyABIs.deposit_box_erc1155_abi;

const erc1155AddressOnMainnet = rinkebyERC1155ABI.erc1155_address;

const web3ForMainnet = new Web3(rinkeby);

let DepositBox = new web3ForMainnet.eth.Contract(
  depositBoxABI,
  depositBoxAddress
);

/**
   * Uses the SKALE DepositBox_ERC1155
   * contract function addERC1155TokenByOwner
   */
  let addERC1155TokenByOwner = DepositBox.methods
    .addERC1155TokenByOwner(schainName, erc1155AddressOnMainnet)
    .encodeABI();

  web3ForMainnet.eth.getTransactionCount(erc1155AddressOnMainnet).then((nonce) => {
    const rawTxAddERC1155TokenByOwner = {
      chainId: chainId,
      from: erc1155OwnerForMainnet,
      nonce: "0x" + nonce.toString(16),
      data: addERC1155TokenByOwner,
      to: depositBoxAddress,
      gas: 6500000,
      gasPrice: 100000000000
    };

    //sign transaction
    const txAddERC1155TokenByOwner = new Tx(rawTxAddERC1155TokenByOwner, {
        chain: "rinkeby",
        hardfork: "petersburg"
      });

    txAddERC1155TokenByOwner.sign(privateKey);

    const serializedTxDeposit = txAddERC1155TokenByOwner.serialize();

    //send signed transaction (addERC1155TokenByOwner)
    web3ForMainnet.eth
      .sendSignedTransaction("0x" + serializedTxDeposit.toString("hex"))
      .on("receipt", (receipt) => {
        console.log(receipt);
      })
      .catch(console.error);
  });

4. Register SKALE Chain contract to IMA

Finally, you need to register the (modified) token contract on the SKALE chain IMA using the addERC1155TokenByOwner method in TokenManagerERC1155 contract. Note that you need to register the contract on Mainnet first, so that the registration on the SKALE Chain can reference the Mainnet token address.

IMA-JS
Web3 JS

In all ima-js code samples we’re assuming that library is already inited. See init instructions here. For the 2 objects usage drop ima. prefix.

// import & init ima-js here

export async function linkERC1155TokenSchain(ima) {
  let erc1155OnMainnet = "[ADDRESS_OF_ERC1155_TOKEN_ON_MAINNET]";
  let erc1155OnSchain = "[ADDRESS_OF_ERC1155_TOKEN_ON_SCHAIN]";

  let address = "[YOUR_ADDRESS]";
  let privateKey = "[YOUR_PRIVATE_KEY]";

  let txOpts = {
    address: address,
    privateKey: privateKey // remove privateKey from txOpts to use Metamask signing
  };

  await ima.schain.addERC1155TokenByOwner(erc1155OnMainnet, erc1155OnSchain, txOpts);
}

import Common from "ethereumjs-common";
const Web3 = require("web3");
const Tx = require("ethereumjs-tx").Transaction;

let schainABIs = "[YOUR_SKALE_CHAIN_ABIs]";
let schainERC1155ABI = "[YOUR_SCHAIN_ERC1155_ABI]";
let rinkebyERC1155ABI = "[YOUR_RINKEBY_ERC1155_ABI]";

let privateKey = new Buffer("[YOUR_PRIVATE_KEY]", 'hex');

let erc1155OwnerForSchain = "[YOUR_SCHAIN_ADDRESS]";

let schainEndpoint = "[YOUR_SKALE_CHAIN_ENDPOINT]";
let chainId = "[YOUR_SKALE_CHAIN_CHAIN_ID]";

const customCommon = Common.forCustomChain(
    "mainnet",
    {
      name: "skale-network",
      chainId: chainId
    },
    "istanbul"
  );

const tokenManagerAddress = schainABIs.token_manager_erc1155_address;
const tokenManagerABI = schainABIs.token_manager_erc1155_abi;

const erc1155AddressOnMainnet = rinkebyERC1155ABI.erc1155_address;
const erc1155AddressOnSchain = schainERC1155ABI.erc1155_address;

const web3ForSchain = new Web3(schainEndpoint);

let TokenManager = new web3ForSchain.eth.Contract(
    tokenManagerABI,
    tokenManagerAddress
);

let addERC1155TokenByOwner = TokenManager.methods
    .addERC1155TokenByOwner(
      erc1155AddressOnMainnet,
      erc1155AddressOnSchain
    )
    .encodeABI();

  web3ForSchain.eth.getTransactionCount(erc1155OwnerForSchain).then((nonce) => {
    const rawTxAddERC1155TokenByOwner = {
      from: erc1155OwnerForSchain,
      nonce: "0x" + nonce.toString(16),
      data: addERC1155TokenByOwner,
      to: tokenManagerAddress,
      gas: 6500000,
      gasPrice: 100000000000
    };

    //sign transaction
    const txAddERC1155TokenByOwner = new Tx(rawTxAddERC1155TokenByOwner, {
      common: customCommon
    });

    txAddERC1155TokenByOwner.sign(privateKey);

    const serializedTxDeposit = txAddERC1155TokenByOwner.serialize();

    web3ForSchain.eth
      .sendSignedTransaction("0x" + serializedTxDeposit.toString("hex"))
      .on("receipt", (receipt) => {
        console.log(receipt);
      })
      .catch(console.error);
  });

Show All Mapped Tokens

To view all mapped tokens (including those mapped manually and automatically)

IMA-JS
Web3 JS

let erc1155Len = await ima.mainnet.getSchainToAllERC1155Length(SCHAIN_NAME);
let allErc1155Tokens = await ima.mainnet.getSchainToAllERC1155(SCHAIN_NAME, 0, erc1155Len);

You can use the getSchainToAllERC1155Length() and getSchainToAllERC1155() functions to return the length and an array of a set of mapped tokens. Note that getSchainToAllERC1155() can only return a maximum set of 10 tokens at a time.

const Web3 = require('web3');

let rinkebyABIs = "[YOUR_SKALE_ABIs_ON_RINKEBY]";
let rinkebyERC1155ABI = "[YOUR_ERC1155_ABI_ON_RINKEBY]";

let rinkeby = "[RINKEBY_ENDPOINT]";
let schainName = "[YOUR_SKALE_CHAIN_NAME]";

const depositBoxAddress = rinkebyABIs.deposit_box_erc1155_address;
const depositBoxABI = rinkebyABIs.deposit_box_erc1155_abi;

const web3ForMainnet = new Web3(rinkeby);

let depositBox = new web3ForMainnet.eth.Contract(
  depositBoxABI,
  depositBoxAddress
);

let mappedNumber = depositBox.methods
  .getSchainToAllERC1155Length(
    schainName
  )
  .call();

let mappedArray = Array();
for (let i = 0; i < (mappedNumber + 9) / 10; i++) {
    let nextIndex = ((i + 1) * 10 < mappedNumber ? (I + 1) * 10 : mappedNumber);
    let mappedArrayPart = depositBox.methods.getSchainToAllERC1155(schainName, i * 10, nextIndex).call();
    mappedArrayPart.forEach( (address) => { mappedArray.push(address) });
}

Get Started with ERC1155 Transfer

The Interchain Messaging Agent can be used for managing ERC1155 tokens between Ethereum and SKALE. The following steps guide you through a complete transfer from Ethereum to SKALE and back. Be sure to follow any one-time setup and mapping steps described here.

Live ERC1155 IMA Demo: https://codesandbox.io/s/erc1155-transfer-skale-interchain-messaging-agent-forked-nmie4

1. Deposit ERC1155 on Ethereum

To send ERC1155 tokens from a user’s wallet to the IMA Deposit Box on Ethereum, you will need to use the depositERC1155 function within the DepositBoxERC1155 IMA contract on Ethereum.

This method is called from Ethereum to move ERC1155 tokens into a Deposit Box.

The DepositBoxERC1155 IMA contract is currently deployed to the Rinkeby testnet. To get the ABIs to interact with IMA on Rinkeby, check out the current release page.

Example Code

IMA-JS
Web3 JS

In all ima-js code samples we’re assuming that library is already inited. See init instructions here. For the 2 objects usage drop ima. prefix. See IMA-JS deposit.js sandbox

It’s also possible to deposit a batch of ERC1155 tokens at once. To do that, just pass erc1155TokenIds and amounts arrays instead of erc1155TokenId and amount to depositERC1155 function.

// import & init ima-js here

export function initTestTokenContract(ima) {
  // initialize ERC1155 contract
  const abiData = require("[ERC1155_ABI_ON_ETHEREUM]");
  return new ima.mainnet.web3.eth.Contract(
    abiData.erc1155_abi,
    abiData.erc1155_address);
}

export async function depositERC1155Single(ima) {
  let tokenName = "[ERC1155_TOKEN_NAME";
  let erc1155TokenId = "[ID_OF_THE_TOKEN_TO_TRANSFER]";
  let amount = "[AMOUNT_IN_WEI]";
  let schainName = "[YOUR_SKALE_CHAIN_NAME]";

  let contractObject = initTestTokenContract(ima);
  ima.mainnet.addERC1155Token(tokenName, contractObject);

  let address = "[YOUR_ADDRESS]";
  let privateKey = "[YOUR_PRIVATE_KEY]";

  let txOpts = { // transaction options
    address: address,
    privateKey: privateKey // remove privateKey from txOpts to use Metamask signing
  };

  let balanceMainnet = await ima.mainnet.getERC1155Balance(erc1155Name, address, erc1155TokenId); // get balance on the Mainnet before the transfer
  let balanceSchain = await ima.schain.getERC1155Balance(erc1155Name, address, erc1155TokenId); // get balance on the sChain before the transfer

  await ima.mainnet.approveAllERC1155(erc1155Name, opts); // approve all transfers

  await ima.depositERC1155(schainName, tokenName, erc1155TokenId, amount, opts);

  // optional
  await ima.schain.waitERC1155BalanceChange(tokenName, address, erc1155TokenId, balanceSchain); // wait for the balance to be changed on the sChain side
}

const Web3 = require('web3');
const Tx = require('ethereumjs-tx').Transaction;

let rinkebyABIs = "[YOUR_SKALE_ABIs_ON_RINKEBY]";
let rinkebyERC1155ABI = "[YOUR_ERC1155_ABI_ON_RINKEBY]";

let privateKey = new Buffer("[YOUR_PRIVATE_KEY]", "hex");
let accountForMainnet = "[YOUR_ACCOUNT_ADDRESS]";
let accountForSchain = "[YOUR_ACCOUNT_ADDRESS]";

let rinkeby = "[RINKEBY_ENDPOINT]";
let schainName = "[YOUR_SKALE_CHAIN_NAME]";
let chainId = "YOUR_RINKEBY_CHAIN_ID";

let mintId = "[ERC1155_MINT_ID]";

const depositBoxAddress = rinkebyABIs.deposit_box_erc1155_address;
const depositBoxABI = rinkebyABIs.deposit_box_erc1155_abi;

const erc1155ABI = rinkebyERC1155ABI.erc1155_abi;
const erc1155Address = rinkebyERC1155ABI.erc1155_address;

const web3ForMainnet = new Web3(rinkeby);

let depositBox = new web3ForMainnet.eth.Contract(
depositBoxABI,
depositBoxAddress
);

let contractERC1155 = new web3ForMainnet.eth.Contract(
erc1155ABI,
erc1155Address
);

/**
   * Uses the openzeppelin ERC1155
   * contract function approve
   * https://github.com/OpenZeppelin/openzeppelin-contracts/tree/master/contracts/token/ERC1155
   */
let approve = contractERC1155.methods
  .approve(depositBoxAddress, "TRUE")
  .encodeABI();

let deposit = depositBox.methods
.depositERC1155(
    schainName,
    erc1155Address,
    mintId,
    web3ForMainnet.utils.toHex(web3ForMainnet.utils.toWei("1", "ether"))
.encodeABI();

web3ForMainnet.eth.getTransactionCount(accountForMainnet).then((nonce) => {
//create raw transaction
const rawTxApprove = {
  chainId: chainId,
  from: accountForMainnet,
  nonce: "0x" + nonce.toString(16),
  data: approve,
  to: erc1155Address,
  gas: 6500000,
  gasPrice: 100000000000
};
//sign transaction
const txApprove = new Tx(rawTxApprove, {
      chain: "rinkeby",
      hardfork: "petersburg"
    });
txTransfer.sign(privateKey);

const serializedTxTransfer = txApprove.serialize();

//send signed transaction (approve)
web3ForMainnet.eth
  .sendSignedTransaction("0x" + serializedTxTransfer.toString("hex"))
  .on("receipt", (receipt) => {
    console.log(receipt);
    web3ForMainnet.eth
      .getTransactionCount(accountForMainnet)
      .then((nonce) => {
        const rawTxDeposit = {
          chainId: chainId,
          from: accountForMainnet,
          nonce: "0x" + nonce.toString(16),
          data: deposit,
          to: depositBoxAddress,
          gas: 6500000,
          gasPrice: 100000000000
        };

        //sign transaction
        const txDeposit = new Tx(rawTxDeposit, {
          chain: "rinkeby",
          hardfork: "petersburg"
        });

        txDeposit.sign(privateKey);

        const serializedTxDeposit = txDeposit.serialize();

        //send signed transaction (deposit)
        web3ForMainnet.eth
          .sendSignedTransaction("0x" + serializedTxDeposit.toString("hex"))
          .on("receipt", receipt => {
            console.log(receipt);
          })
          .catch(console.error);
      });
  })
  .catch(console.error);
});

2. Exit from SKALE Chain

To send ERC1155 tokens back to Ethereum, you will need to use the exitToMainERC1155 function within the TokenManagerERC1155 IMA contract on the SKALE Chain.

This method is called from the SKALE Chain to send funds and move the token back to Ethereum.

Note that the SKALE Chain user must have:

sFUEL to conduct the exitToMain transaction on the SKALE Chain TokenManager contract.
a sufficient balance of ETH (1,000,000 gas * gas price in wei at time of transaction submission) in the Community Pool to initiate the exit to Ethereum See Funding Exits.
not been locked by the CommunityLocker.
not have exceeded the total SKALE Chain exit message rate (default is 5 minutes per SKALE Chain exit message). See Community Locker. To get the last message timestamp, perform an eth_call to CommunityLocker.lastMessageTimeStamp.

The TokenManagerERC1155 IMA contract is pre-deployed to your SKALE Chain. Please reach out to your account manager to receive the ABIs specific for your SKALE Chain.

Example Code

IMA-JS
Web3 JS

In all ima-js code samples we’re assuming that library is already inited. See init instructions here. For the 2 objects usage drop ima. prefix. See IMA-JS deposit.js sandbox

It’s also possible to withdraw a batch of ERC1155 tokens at once. To do that, just pass erc1155TokenIds and amounts arrays instead of erc1155TokenId and amount to withdrawERC1155 function.

// import & init ima-js here

export function initTestTokenContract(ima) {
  // initialize ERC1155 contract
  const abiData = require("[ERC1155_ABI_ON_SCHAIN]");
  return new ima.schain.web3.eth.Contract(
    abiData.erc1155_abi,
    abiData.erc1155_address);
}

export async function exit(ima) {
  let tokenName = "[ERC1155_TOKEN_NAME";
  let erc1155TokenId = "[ID_OF_THE_TOKEN_TO_TRANSFER]";
  let amount = "[AMOUNT_IN_WEI]";
  let schainName = "[YOUR_SKALE_CHAIN_NAME]";

  let contractObject = initTestTokenContract(ima);
  ima.schain.addERC1155Token(tokenName, contractObject);

  let address = "[YOUR_ADDRESS]";
  let privateKey = "[YOUR_PRIVATE_KEY]";

  let txOpts = { // transaction options
    address: address,
    privateKey: privateKey // remove privateKey from txOpts to use Metamask signing
  };

  let balanceMainnet = await ima.mainnet.getERC1155Balance(erc1155Name, address, erc1155TokenId); // get balance on the Mainnet before the transfer

  await ima.schain.approveAllERC1155(erc1155Name, erc1155TokenId, opts); // approve all transfers

  // 1. for single object
  await ima.withdrawERC1155(tokenName, erc1155TokenId, amount, txOpts);
  // 2. for separate sChain object
  await ima.schain.withdrawERC1155("[ADDRESS_OF_ERC1155_ON_MAINNET]", address, erc1155TokenId, amount, txOpts);

  // optional
  await ima.mainnet.waitERC1155BalanceChange(tokenName, address, erc1155TokenId, balanceMainnet); // wait for the balance to be changed on the Mainnet side
}

const Web3 = require('web3');
const Common = require('ethereumjs-common');
const Tx = require('ethereumjs-tx').Transaction;

let schainABIs = "[YOUR_SKALE_CHAIN_ABIs]");
let rinkebyERC1155ABI = "[YOUR_RINKEBY_ERC1155_ABI]";
let schainERC1155ABI = "[YOUR_SKALE_CHAIN_ERC1155_ABI]";

let privateKey = new Buffer('[YOUR_PRIVATE_KEY]', 'hex');
let accountForMainnet = "[YOUR_MAINNET_ACCOUNT_ADDRESS]";
let accountForSchain = "[YOUR_SCHAIN_ACCOUNT_ADDRESS]";
let schainEndpoint = "[YOUR_SKALE_CHAIN_ENDPOINT]";
let chainId = "[YOUR_SKALE_CHAIN_CHAIN_ID]";

const customCommon = Common.forCustomChain(
    "mainnet",
    {
      name: "skale-network",
      chainId: chainId
    },
    "istanbul"
  );

let mintId = "[ERC1155_MINT_ID]";

const tokenManagerAddress = schainABIs.token_manager_erc1155_address;
const tokenManagerABI = schainABIs.token_manager_erc1155_abi;

const erc1155ABI = schainERC1155ABI.erc1155_abi;

const erc1155Address = schainERC1155ABI.erc1155_address;
const erc1155AddressRinkeby = rinkebyERC1155ABI.erc1155_address;

const web3ForSchain = new Web3(schainEndpoint);

let tokenManager = new web3ForSchain.eth.Contract(
  tokenManagerABI,
  tokenManagerAddress
);

let contractERC1155 = new web3ForSchain.eth.Contract(
  erc1155ABI,
  erc1155Address
);

/**
   * Uses the openzeppelin ERC1155
   * contract function transfer
   * https://github.com/OpenZeppelin/openzeppelin-contracts/tree/master/contracts/token/ERC1155
   */
let approve = contractERC1155.methods
  .approve(tokenManagerAddress, "TRUE")
  .encodeABI();

let exit = tokenManager.methods
  .exitToMainERC1155(
    erc1155AddressRinkeby,
    mintId,
    web3ForSchain.utils.toHex(web3ForSchain.utils.toWei("1", "ether")
  )
  .encodeABI();

//get nonce
web3ForSchain.eth.getTransactionCount(accountForSchain).then((nonce) => {

  //create raw transaction (approval)
  const rawTxApprove = {
    from: accountForSchain,
    nonce: "0x" + nonce.toString(16),
    data: approve,
    to: erc1155Address,
    gasPrice: 100000000000,
    gas: 8000000
  };

  //sign transaction
  const TxApprove = new Tx(rawTxApprove, { common: customCommon });
    TxApprove.sign(privateKey);

  const serializedTxApprove = TxApprove.serialize();

  //send signed transaction (approval)
  web3ForSchain.eth
    .sendSignedTransaction("0x" + serializedTxApprove.toString("hex"))
    .on("receipt", receipt => {
      console.log(receipt);

      //get next nonce
      web3ForSchain.eth.getTransactionCount(accountForSchain).then(nonce => {

        //create raw transaction (exit)
        const rawTxExit = {
          from: accountForSchain,
          nonce: "0x" + nonce.toString(16),
          data: exit,
          to: tokenManagerAddress,
          gasPrice: 100000000000,
          gas: 8000000
        };

        //sign transaction (exit)
        const txExit = new Tx(rawTxExit, { common: customCommon });
        txExit.sign(privateKey);

        const serializedTxExit = txExit.serialize();

        //send signed transaction (exit)
        web3ForSchain.eth
          .sendSignedTransaction("0x" + serializedTxExit.toString("hex"))
          .on("receipt", receipt => {
            console.log(receipt);
          })
          .catch(console.error);
      });
    })
    .catch(console.error);
});

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