Blockchain - Payment Verification
You may be a vendor who wants to verify a past payment made by you. As the blockchain you are holding on your machine only contains the block headers as shown in the earlier figure, the transaction you are searching for is not present in the copy of your blockchain.
Using the copy of the blockchain you have, search backwards until you find the transaction that is timestamped in the block where your transaction is. You can now request the Merkle tree for the selected block to obtain the transaction that you need. Here is an example of this.
The contents of Tx103 may not be visible to you, but you know that this has been accepted by both the block to which it belongs and all subsequent blocks in the chain. Therefore, you can trust this transaction and proceed with your business with confidence.