AIP-039: Access transaction hash within Java contract

[jennijuju]

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Title: To access transaction hash within Java contracts Author(s): Jiaying Wang Type: ASC (Aion Standards and Conventions) Status: Draft Creation Date: July 19, 2019 Contact Information: [email protected]

Summary

This is an extended AIP of AIP 007 . Need to access transaction hash during Java contract method execution.

Value Proposition

Transaction hash is a unique identifier which can be used during the execution of Java contract method to save the state.

Motivation

This information is available for Solidity contract on FastVM. Same needs for the Java contract can be expected.

Non-Goals

The scope of this document is to provide access to only transaction hash when a Java contract method being executed.

Success Metrics

User is able to retrieve the transaction hash in the contract.

A constant function must be implemented.

transactionhash function

Returns hash of the transaction.

TBD.

Logic

N/A

Cross Chain Functionality

N/A

Risks & Assumptions

Compatibility notes:
transactionhash is not supported in Ethereum solidity, in case of porting Aion contract on Ethereum, this function will not be available on Ethereum.

Test Cases

N/A

Implementations

Reference Implementation

Dependencies

N/A

Copyright

All AIP’s are public domain. Copyright waiver: https://creativecommons.org/publicdomain/zero/1.0/

[fulldecent]

What are the use cases? A seed for a random number generator?

Will past hashes be accessible? This is possible on Ethereum, up to a limit. There are tradeoffs in setting that limit.