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---
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Alice can now send Charlie the transaction key along with transaction ID and Bob's address.
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Alice can open her monero-wallet-gui and go to the history page to see her transaction detail:
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Alice can query it thus in monero-wallet-cli (new name for the old simplewallet):
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Alice would plug in her actual transaction ID instead of this TXID placeholder. All being well, the one time transaction key will be displayed.
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Charlie now received those three pieces of information, and wants to check Alice is telling the truth: on an up to date blockchain,
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Charlie types in monero-wallet-cli:
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Charlie will open his monero-wallet-gui and go to the Advanced > Prove/Check page to fill the Check section with the informations provided by Alice:
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### Check payments
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> check_tx_key TXID TXKEY ADDRESS
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#### CLI
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> get_tx_key TXID
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#### GUI
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Here, she can copy the transaction ID and Bob's address by clicking on each of them. Then she can click on `P` to get a payment proof (transaction key):
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If it's set to 0, set it to 1:
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Monero, however, is private: that information is not available publicly on the blockchain. The steps are therefore a bit more involved.
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Note: if several transactions were made, this needs repeating for each such transaction.
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Note that this will only work if monero-wallet-cli is set to save transaction keys. To double check:
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