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  AIP: 12
  Title: Smart Contract
  Authors: Adrian Cearnau, François-Xavier THOORENS 
  Status: Draft
  Type: Standards Track
  Created: 2017-10-23
  Last Update: 2017-10-23

Abstract

Integrate a modified version of Ethereum Virtual Machine (EVM) and define the transactions to register and call smart contracts. Possible specific use to ark, after integration of smart contracts:

  • delegate pools can improve the delegate sharing distribution making this automatic and public
  • delegate votes weight can be automatically adjusted/optimisised according to their productivity/ranking etc...
  • more powerful multisignature mechanics
  • ...

This is early specifications subject to many changes as it is developed and tested.

Specifications

  1. Transactions

Type 9 (smart contract registration)

Description Size (bytes) Example
code               ...           serialised code in bytes                                         
  • The address of the contract is calculated by applying sha256 + ripemd160 to the transaction serialisation. Then a byte 0x19 is added before the base58check performed. Contract addresses will start with "C" instead of "A" for normal addresses

Type 10 (smart contract call)

Description Size (bytes) Example
contract address   21             0x191dfc69b54c7fe901e91d5a9ab78388645e2427ea                      
amount 8 0x8096980000000000
params             ...          0x171dfc69b54c7fe901e91d5a9ab78388645e2427ea                      
  1. Storage New tables are implemented
  • Contract to store transaction contract with the following fields:

    1. owner public key (indexed)
    2. code
    3. address of the contract (indexed) linking to mem_accounts
  • Contract state

    1. contract address (indexed)
    2. state (BLOB)
    3. block_id (indexed)
  • Contract logs

    1. contract address (indexed)
    2. event id (indexed)
    3. event
    4. sender (indexed)
    5. block_id (indexed)
  1. Contract transactions Output transactions from contract can be any existing supported transactions but they are accepted by other nodes if and only if they are created, signed by the block forger and are valid transactions.

  2. ARK VM ArkVM will support most operations of EVM and adapted to property of ark (addresses, signatures, keys, block-id etc...)

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