How are the stored transactions receipts referred from the block?

Question

Based on the data structure of Ethereum blocks and transactions which is also represented here, we know the following sentences about the transactions receipts:

1- The transactions receipts are stored in the LevelDB.
2- The transactions receipts tire is created in RAM when there is a need for it.
3- The root hash of the trie is stored in the block header.

But if the receipts are neither stored inside the block body nor in the transactions data structure, then what is the link inside the block to the receipts in the LevelDB? And how do we know which receipt is related to which transaction?

Answer 1

The receipt is generated when executing the transaction. To validate a receipt that was generated by a transaction you have to execute the transaction.

Answer 2

In LevelDB the receipts are keyed by the block hash, stored as a list in the order the transactions were processed in the block.

So the link between the block and its receipts is pretty simple:

Block Hash -> Transaction Receipts

And we know which transaction relates to each receipt because the transaction and receipt share the same index in their respective lists.

There is no rpc endpoint to get the receipts for a block, so instead if you want to retrieve all receipts in a block you would need to call eth_getBlock and for each transaction in the block call eth_getTransactionReceipt with the hash of the transaction.