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Transaction and Receipt

Transaction

Transaction: A transaction authorizes the blockchain to make changes to the world state, in the form of, either:

  • Tokens transfer from one account to another, or
  • A smart contract invocation.

There are three kinds of transactions in the testnet:

  • External Account to External Account (EtoE): A transaction that only transfers native token (TXPLL) balance from one external account to another external account. A transaction message is inferred to be EtoE if both its from address and to address have empty code.
  • External Account to Contract (EtoC): A transaction that calls a smart contract. A transaction message is inferred to be EtoC if its from address has empty code, and its to address has non-empty code.
  • Deploy Contract (DeployC): A transaction that deploys a smart contract. A transaction message is inferred to be Deploy if its from address has empty code and its to address is 0x0000000000000000000000000000000000000000000000000000000000000000 (32-byte zero).

Receipt

Receipt: A receipt is produced upon execution of each transaction. Its fields provide a succinct summary of ‘what happened’ during the transaction execution flow:

  • Exit Code
  • Gas Consumed
  • Return Value
  • Events

Event: Events are key-value pairs emitted during a smart contract execution. Events allow decentralized applications to quickly prove to users that a particular branch/line of code was executed during a transaction, by querying for the existence of events in blocks.

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