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