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How can I construct a transaction using a watch only wallet RPC and cold sign using any nodejs library? In the end, I have to send this to the blockchain using the daemon or watch only wallet RPC.

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Using the wallet RPC on your view only (hot) wallet, you can call transfer with get_tx_metadata: true and do_not_relay: true which will yield an unsigned_txset in the response.

Then on the spend wallet RPC (your cold wallet), call sign_transfer, passing in the unsigned_txset from above, which will yield a signed_txset in the response.

Back on the view only (hot) wallet RPC, call submit_transfer, passing the data from signed_txset above in the tx_data_hex parameter.

The linked methods all have examples of these steps using curl. The calls are just simple HTTP POST requests, so libraries are not really needed.

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  • It's not solve my problem. I can't use cold wallet in my solution, I want to sign transaction in my nodejs application. In other words, the private spend key should not leave my code.
    – intosKai
    Nov 7, 2019 at 6:06
  • Doing this without the RPC is far from trivial and there is no javascript library that has all the code you would need. My answer to a previous question of yours applies.
    – jtgrassie ♦
    Nov 7, 2019 at 13:04

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