Which is issued when a transaction is concluded, recording the gas consumed, transaction hash, input?

Question: Which is issued when a transaction is concluded, recording the gas consumed, transaction hash, input?

One of the important concepts in Ethereum is the receipt, which is issued when a transaction is concluded, recording the gas consumed, transaction hash, input and other relevant information. In this blog post, we will explain what receipts are, how they are generated and stored, and why they are useful for developers and users.

A receipt is a data structure that contains the following fields:

- status: a boolean value that indicates whether the transaction was successful or reverted.

- cumulativeGasUsed: the total amount of gas used by all transactions in the same block as this transaction.

- logs: an array of log entries emitted by the smart contracts involved in this transaction. Logs are used for events and notifications.

- logsBloom: a bloom filter that summarizes the logs for fast querying.

- transactionHash: the hash of this transaction.

- contractAddress: the address of the newly created contract, if this transaction was a contract creation.

- gasUsed: the amount of gas used by this transaction.

- blockHash: the hash of the block that contains this transaction.

- blockNumber: the number of the block that contains this transaction.

- from: the address of the sender of this transaction.

- to: the address of the receiver of this transaction, or null if this was a contract creation.

- transactionIndex: the index of this transaction in the block.

Receipts are generated by the Ethereum Virtual Machine (EVM) after executing each transaction. They are stored in a trie structure, which is a tree-like data structure that allows for efficient storage and retrieval of key-value pairs. The root hash of the receipt trie is included in the block header, which ensures that receipts are part of the consensus and can be verified by any node.

Receipts are useful for several reasons. First, they provide a proof of execution for transactions, which can be used to verify their outcome and effects. Second, they enable efficient querying of logs, which are essential for monitoring and interacting with smart contracts. Third, they allow for stateless clients, which are nodes that do not store the entire state of the blockchain, but only verify transactions using receipts and other proofs.

In conclusion, receipts are an integral part of Ethereum's design and functionality. They record the gas consumed, transaction hash, input and other information for each transaction, and they are stored in a trie structure that can be easily accessed and verified. Receipts enable various features and benefits for developers and users, such as proof of execution, log querying and stateless clients.

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