If our web app helps the user to do any crypto transfer, so it connects to the wallet app of user's choice (eg Coinomi) and sends a request for transfer and the user approves it in the wallet, can it be universally done for any cryptocurrencies, for example both Bitcoin (BTC) and Ether (ETH)? Or we need to use different technologies, WalletConnect for Ethereum blockchain (my understanding is that WalletConnect can only be used with Ethereum), but is there something similar to web3.js and WalletConnect that we can use for Bitcoin to facilitate the transfer?

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    I don't know what "WalletConnect" is, but if you're asking whether there is a standard for presenting a payment request to a bitcoin wallet, you might be looking for BIP21.
    – Murch
    Jul 7 at 15:15


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