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{% include disclaimer.html translated="no" translationOutdated="no" %}
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### Prove payments
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When you send money to a party who then disputes the payment was made, you need to be able to prove the payment was made.
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With Bitcoin, this is typically done by looking up the transaction ID, where the origin and destination addresses are shown, along with the amount transacted.
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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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To prove to Charlie that she made a payment to Bob, Alice must supply Charlie three pieces of information:
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- the transaction ID, as is done in Bitcoin - Bob's address, as is done with Bitcoin - the transaction's key, which is new with Monero and other CryptoNote currencies
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When Alice made the transaction, a one time key was automatically generated just for this transaction.
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#### CLI
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Alice can query it thus in monero-wallet-cli (new name for the old simplewallet):
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> get_tx_key TXID
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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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Note that this will only work if monero-wallet-cli is set to save transaction keys. To double check:
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> set
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If it's set to 0, set it to 1:
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> set store-tx-info 1
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#### GUI
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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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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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