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I am trying to create a spend-proof on a cold-wallet (an air-gapped laptop), but thought that the wallet might need a connection to a node to create it.

Is it possible to exchange data between a view-only wallet and a cold wallet, such that the latter can get all the information it needs to create a spend-proof?

I am aware that the cold-wallet can create key-images for a view-only wallet if the latter provides the former with the needed outputs and was wondering whether something similar can be done for spend-proofs, or if that is a feature exclusive to a hot full wallet (i.e. exclusive to a wallet having the spend-key and which is connected to a node).

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You cannot prove you have spent anything until you broadcast a transaction. So you'll do this on your hot wallet, when you broadcast the transaction. See this answer for how to prove a payment.

For performing a cold and hot wallet tx, see this answer, and do the get_tx_key txid after step 11.

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  • Does that mean that the get_spend_proof command relies on the transaction key too and thus can only be executed by a wallet that has broadcast the transaction?
    – Edward Lucas
    Commented Feb 16, 2019 at 23:17
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    get_spend_proof is slightly different and cannot be done on a watch-only wallet. To use that on a cold-wallet, you'd have to continue from step 11 to do 12, 1, 2 and 3 before calling get_spend_proof. But it requires a connection to a daemon, so my answer above is probably what you are looking for instead.
    – jtgrassie
    Commented Feb 16, 2019 at 23:26
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    Nah I actually had the get_spend_proof command in mind but I didn't realize that "spend-proof" was ambiguous (in light of there also being get_tx_key for proving spends). Your answers did solve my problem regardless though, so thanks for the clarification, much appreciated! :)
    – Edward Lucas
    Commented Feb 16, 2019 at 23:46
  • Glad I could help.
    – jtgrassie
    Commented Feb 16, 2019 at 23:57

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