Crosschain Transaction

You can perform a crosschain transaction via the DEMOS network with the help of the DEMOS sdk. Here is how you can send tokens on Sepolia testnet via DEMOS using the sdk:

0. Imports

The following imports will be needed to create the transaction.

import {
  Demos,
  prepareXMPayload,
  prepareXMScript,
} from "@kynesyslabs/demosdk/websdk";

import { EVM } from "@kynesyslabs/demosdk/xm-websdk";

1. Creating the EVM payload

You can create the payload for Sepolia via the crosschain module of the sdk as follows:

const sepolia_rpc = "https://rpc.ankr.com/eth_sepolia"
const evm = await EVM.create(sepolia_rpc);
await evm.connectWallet(
  "e0a00e307....." // fill in with your sepolia private key
);

const evm_tx = await evm.preparePay(
    "0xda3ea78Af43E6B1c63A08cD0058973F14e5556b0",
    "0.000000001",
)

The evm_tx will be a signed transaction to move 0.000000001 Sepolia ETH from the connected wallet to0xda3ea78Af43E6B1c63A08cD0058973F14e5556b0.

2. Converting the payload into an XMScript

The XMScript contains information that helps a DEMOS node understand what to do with a signed crosschain payload.

const xmscript = prepareXMScript({
  chain: "eth",
  subchain: "sepolia",
  signedPayloads: [evm_tx],
  type: "pay",
});

The xmscript will be embedded into a DEMOS transaction and sent to the DEMOS network in the upcoming sections.

3. Creating a DEMOS instance

A DEMOS identity is needed to sign the outgoing DEMOS transaction.

const demos = new Demos()

const demos_rpc = "https://node2.demos.sh";
await demos.connect(demos_rpc);

const mnemonic = demos.newMnemonic()
await demos.connectWallet(mnemonic)

4. Converting the XMScript to a Demos transaction

You can convert the xmscript into a DEMOS transaction by calling prepareXMPayload and passing the xmscript and the Demos instance.

const tx = await prepareXMPayload(xmscript, demos);

The tx will be a signed Demos transaction containing the Sepolia tx.

5. Broadcasting to a Demos node

You can now broadcast the transaction as shown:

// confirm tx
const validityData = await demos.confirm(tx);
console.log("validityData", validityData);

// execute
const res = await demos.broadcast(validityData);
console.log("res", res);

Getting Started

WebSDK

Cross Chain

Utilities

Storage Programs

Code Examples

Web2 Integration

Bridges

Advanced

Wallet Integration

Crosschain Transaction

Crosschain Transaction

0. Imports

1. Creating the EVM payload

2. Converting the payload into an XMScript

3. Creating a DEMOS instance

4. Converting the XMScript to a Demos transaction

5. Broadcasting to a Demos node

​Crosschain Transaction

​0. Imports

​1. Creating the EVM payload

​2. Converting the payload into an XMScript

​3. Creating a DEMOS instance

​4. Converting the XMScript to a Demos transaction

​5. Broadcasting to a Demos node

Crosschain Transaction

0. Imports

1. Creating the EVM payload

2. Converting the payload into an XMScript

3. Creating a DEMOS instance

4. Converting the XMScript to a Demos transaction

5. Broadcasting to a Demos node