NEO3 Development Guide

A development guide for basic tool developers of NEO3 to facilitate the underlying construction

Table

• Wallets
• Transactions
• RPC
• Smart contracts
• NeoVM

Changes in NEO3

Wallet

• UPDATE

  • Address Script: change the way to construct the address script with the public key

    • Ordinary Address

    NEO2: 0x21 + publicKey(compressed 33bytes) + 0xac()
    NEO3: 0x21 + publicKey(compressed 33bytes) + 0x68 + 0x747476aa
    

    • Multi-Signature Address

    NEO2: emitPush(N) + 0x21 + publicKey1(compressed 33bytes) + .... + 0x21 + publicKeym(compressed 33bytes)  + emitPush(M) + 0xae()
    NEO3: emitPush(N) + 0x21 + publicKey1(compressed 33bytes) + .... + 0x21 + publicKeym(compressed 33bytes)  + emitPush(M) + 0x68 + 0xc7c34cba
    

Transactions

• UPDATE

  • System Fee: cancel the free discount of 10 GAS for each transaction and redefine the fee of each OpCode
  • Network Fee: redefine the calculation formula for the network fee

• DELETE

  • Transaction Type: discard the previous 9 types of the transaction in NEO2 and use the unified transaction instead, as well as the redefinition of the transaction structure
  • Assets: discard the UTXO model for the NEO and GAS token, using the account model implemented by the native contract instead

RPC

• UPDATE

  • Invocation Style: getblockheader，getrawmempool
  • Returns: getblock，getblockheader，getrawtransaction，getversion，getcontractstate

• DELETE

  • Discard the following commands: claimgas, getaccountstate, getassetstate, getclaimable, getmetricblocktimestamp, gettxout, getunspents, invoke, etc.

Smart Contracts

• ADD

  • Manifest: used to describe the features of the contract and deployed with NEF files
  • native contracts: running in the native code rather than in the virtual machine, including NeoToken, GasToken and PolicyToken
  • Accessing to network resources: to be added
  • System Trigger: triggered when the node receives a new block and currently only triggers the execution of the native contract
  • Interop Service: System.Binary.Serialize, System.Binary.Deserialize, System.Contract.Create, System.Contract.Update, System.Contract.Call, System.Contract.CallEx, System.Contract.IsStandard, Neo.Native.Tokens.NEO, Neo.Native.Tokens.GAS, Neo.Native.Policy, etc.

• UPDATE

  • Reduce the system fee for OpCode and interop services,

• DELETE

  • Interop Service: Neo.Runtime.GetTrigger, Neo.Runtime.CheckWitness, Neo.Runtime.Notify, Neo.Runtime.Log, Neo.Runtime.GetTime, Neo.Runtime.Serialize, Neo.Runtime.Deserialize, Neo.Blockchain.GetHeight, Neo.Blockchain.GetHeader, Neo.Blockchain.GetBlock, Neo.Blockchain.GetTransaction, Neo.Blockchain.GetTransactionHeight, Neo.Blockchain.GetAccount, Neo.Blockchain.GetValidators, Neo.Blockchain.GetAsset, Neo.Blockchain.GetContract, Neo.Header.GetHash, Neo.Header.GetVersion, Neo.Header.GetPrevHash, Neo.Header.GetMerkleRoot, Neo.Header.GetTimestamp, Neo.Header.GetIndex, Neo.Header.GetConsensusData, etc.

NeoVM

• ADD

  • PUSHINT, JMP_L, JMPIF_L, JMPIFNOT_L, JMPEQ, JMPEQ_L, JMPNE, JMPNE_L, JMPGT, JMPGT_L, JMPGE, JMPGE_L, JMPLT, JMPLT_L, JMPLE, JMPLE_L, CALL_L, CALLA, ASSERT, ABORT, CLEAR, REVERSE3, REVERSE4, REVERSEN, SLot, Type etc.

• DELETE

  • Discard the following opcodes: PUSHF, PUSHBYTES1, PUSHBYTES75, APPCALL, TAILCALL, XTUCK, XSWAP, FROMALTSTACK, TOALTSTACK, DUPFROMALTSTACK, SIZE, LTE, GTE, SHA1, SHA256, HASH160, HASH256, CHECKSIG, VERIFY, CHECKMULTISIG, ARRAYSIZE, CALL_I, CALL_E, CALL_ED, CALL_ET, CALL_EDT.

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