Talking about UTXOs consolidation. Does anybody know if it's possible to create a transaction in Sparrow Wallet (online watch only), sign it in Electrum Wallet (offline), for example, and than broadcast it from any of those wallets?

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No.

That will defeat the purpose of the watch Only wallet.

Because if it's a watch Only wallet You need the device to sign the transaction. If not, it won't show you the transaction I. D. to broadcast it somewhere else

Thank you for your time, mate. I've really apreciated your attention, but I don't know if I've made myself clear.

Actualy, what I've mean was: may I create a transaction in a "watch only" sparrow, sign it in a offline electrum, than broadcast in an online electrum (other electrum, a watch only electrum able to broadcast)? Would it be possible?

Opa o que seria 😌

Creio que o broadcast tenha que ser feito na wallet que criou a transação, no caso na Sparrow

Valeu, irmão. Fiz o teste aqui e deu certo. Constatei ser possível sim montar a transação em uma, assinar em outra e fazer o broadcast por onde você quiser. Pelo menos, entre Sparrow e Electrum deu certo.

Eu tentei com BlueWallet e electrum e não consegui.

Not sure, but I believe a watch only wallet has only public keys, not private keys, and so can only generate and look up balances of receiving addresses, and thus cannot sign and thus cannot spend.