const tx = await arweave.createTransaction(
      { data: JSON.stringify(data) },
      key
    );

    console.log(tx);
    tx.addTag("App-Name", "demo");
    tx.addTag("App-Version", "0.0.1");
    tx.addTag("Unix-Time", Math.round(new Date().getTime() / 1000));
    tx.addTag("Type", "publish");

    console.log(tx);

    await arweave.transactions.sign(tx, key);
    console.log(tx.id);

    let { status } = await arweave.transactions.post(tx);