IBC Cross-Chain Transfers

import { useCosmosClient } from "./useCosmosClient";
import { coins } from "@cosmjs/stargate";
import { MsgTransfer } from "cosmjs-types/ibc/applications/transfer/v1/tx";
import { Height } from "cosmjs-types/ibc/core/client/v1/client";

function IBCTransfer() {
  const { signingClient } = useCosmosClient("https://rpc.cosmos.network");

  const sendIBCTransfer = async () => {
    if (!signingClient) return;

    const accounts = await signingClient.signer.getAccounts();
    const sender = accounts[0].address;
    
    const currentHeight = await signingClient.getHeight();
    const timeoutHeight = Height.fromPartial({
      revisionNumber: 1n,
      revisionHeight: BigInt(currentHeight + 1000),
    });
    
    const msgTransfer = {
      typeUrl: "/ibc.applications.transfer.v1.MsgTransfer",
      value: MsgTransfer.fromPartial({
        sourcePort: "transfer",
        sourceChannel: "channel-141", // Osmosis channel
        token: {
          denom: "uatom",
          amount: "1000000", // 1 ATOM
        },
        sender: sender,
        receiver: "osmo1...", // Osmosis address
        timeoutHeight: timeoutHeight,
        timeoutTimestamp: 0n,
      }),
    };

    const fee = {
      amount: coins(5000, "uatom"),
      gas: "250000",
    };

    try {
      const result = await signingClient.signAndBroadcast(
        sender,
        [msgTransfer],
        fee,
        "IBC transfer via Para"
      );
      
      console.log("IBC transfer initiated:", result.transactionHash);
    } catch (error) {
      console.error("IBC transfer failed:", error);
    }
  };

  return (
    <button onClick={sendIBCTransfer}>Send 1 ATOM to Osmosis</button>
  );
}