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![Payment proof](/img/resources/user-guides/en/prove-payment/payment-proof.png)
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Alice can now send Charlie the transaction key along with transaction ID and Bob's address.
Note: if several transactions were made, this needs repeating for each such transaction.
### Check payments
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:
> check_tx_key TXID TXKEY ADDRESS
The information supplied by Alice plugs neatly instead of the placeholders. monero-wallet-cli will use the transaction key to decode the transaction, and display how much this particular transaction sent to this address.
Obviously, Charlie will want to double check with Bob the address is really his - same as with Bitcoin.
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)
Then clicking on Check will tell Charlie how much this particular transaction sent to this address, and how much confirmation the transaction had:
![Payment checked](/img/resources/user-guides/en/prove-payment/payment-checked.png)