Blockchain

JP Morgan Quorum 的伊斯坦布爾共識機制使用什麼合約？

  • February 16, 2018

在JPMorgan Quorum github 的“7nodes”安裝範例中，使用了這樣的創世文件（“ istanbul-genesus.json ”）：

{
"alloc": {
 "0x0000000000000000000000000000000000000020": {
   "code": "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",
   "storage": {
     "0x0000000000000000000000000000000000000000000000000000000000000001": "0x02",

     "0x0000000000000000000000000000000000000000000000000000000000000002": "0x03",
     "0x29ecdbdf95c7f6ceec92d6150c697aa14abeb0f8595dd58d808842ea237d8494": "0x01",
     "0x6aa118c6537572d8b515a9f9154be55a3377a8de7991cd23bf6e5ceb368688e3": "0x01",
     "0x50793743212c6f01d326957d7069005b912f8215f10c7536be6b10782c6c44cd": "0x01",

     "0x0000000000000000000000000000000000000000000000000000000000000004": "0x02",
     "0xaca3b76ed4968740c3180dd7fa37f4aa229a2c758a848f53920e9ccb4c4bb74e": "0x01",
     "0xd188ba2dc293670542c1befaf7678b0859e5354a0727d1188b2afb6f47fe24d1": "0x01"
   },
   "balance": "1000000000000000000000000000"
 },

 "0xed9d02e382b34818e88b88a309c7fe71e65f419d": {
   "balance": "1000000000000000000000000000"
 },
 "0xca843569e3427144cead5e4d5999a3d0ccf92b8e": {
   "balance": "1000000000000000000000000000"
 },
 "0x0fbdc686b912d7722dc86510934589e0aaf3b55a": {
   "balance": "1000000000000000000000000000"
 },
 "0x9186eb3d20cbd1f5f992a950d808c4495153abd5": {
   "balance": "1000000000000000000000000000"
 },
 "0x0638e1574728b6d862dd5d3a3e0942c3be47d996": {
   "balance": "1000000000000000000000000000"
 }
},
"coinbase": "0x0000000000000000000000000000000000000000",
"config": {
 "homesteadBlock": 1,
   "eip150Block": 2,
   "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
   "eip155Block": 3,
   "eip158Block": 3,
 "istanbul": {
   "epoch": 30000,
   "policy": 0
 },
 "isQuorum": true
},
"extraData": "0x0000000000000000000000000000000000000000000000000000000000000000f897f893946571d97f340c8495b661a823f2c2145ca47d63c2948157d4437104e3b8df4451a85f7b2438ef6699ff94b131288f355bc27090e542ae0be213c20350b76794b912de287f9b047b4228436e94b5b78e3ee1617194d8dba507e85f116b1f7e231ca8525fc9008a696694e36cbeb565b061217930767886474e3cde903ac594f512a992f3fb749857d758ffda1330e590fa915e80c0",
"gasLimit": "0x47b760",
"difficulty": "0x1",
"mixHash": "0x63746963616c2062797a616e74696e65206661756c7420746f6c6572616e6365",
"nonce": "0x0",
"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"timestamp": "0x00"

}

因此，這個創世文件顯然包含地址 0x00…0020 的合約二進制程式碼。

但是這個合約的原始碼是什麼？

我讀過，在舊版本的 Quorum 中，這個合約是 QuorumChain 共識算法的投票合約。在最新版本中，他們刪除了 QuorumChain 並添加了伊斯坦布爾 BFT 共識。所以是新契約。

而且您在 Quorum 原始碼中找不到它的原始碼。來源中沒有與此類似的契約（即使按規模）。

我在 EVM mnemocode 中反編譯了這個合約，但原始來源會更有幫助。

附言

我問了這個問題 Quorum 團隊（通過他們的聯繫電子郵件） - 他們沒有回應。

可能是block_voting.sol。我有 90% 的把握。

另外，我有 90% 的把握它是垃圾。伊斯坦布爾共識不使用該合約。

一些證據（使用radare2）：

  1. 從“istanbul-genesus.json”中剪切“code:”內容，並粘貼到文本文件“istanbul-cintract.hex”。刪除“0x”前綴：“606060405236156100c45760e060020a6…
  2. 通過“rax2”工具將其轉換為二進制：
$ rax2 -s < ./istanbul-cintract.hex > ./istanbul-cintract.bin
  1. 用“radare2”反彙編（如果沒有安裝“evm”架構包，安裝$ r2pm install evm）。有用的連結是Debugging EVM和Reversing EVM。
$ r2 -A -a evm ./istanbul-cintract.bin
 Cannot set bits 64 to 'evm'
 Cannot set bits 64 to 'evm'
 -- some kind of jokes form radare2 here... dont panic
 [0x00000000]> pdf > ./istanbul-cintract.asm
  1. 現在你得到了“istanbul-cintract.asm”。對其進行一些分析：
0x00000014 6312909485 push4 0x12909485 ; it is "SELECTOR" of public function
                                 ; S:[0x12909485, FUNC_SELECTOR]  //FUNC_SELECTOR - first 4 byte of transaction data
0x00000019 81         dup2        ; S:[FUNC_SELECTOR, 0x12909485, FUNC_SELECTOR]
0x0000001a 14         eq          ; S:[(FUNC_SELECTOR == 0x12909485), FUNC_SELECTOR]
0x0000001b 6100c9     push2 0xc9  ; S:[0xc9, (FUNC_SELECTOR == 0x12909485), FUNC_SELECTOR]
0x0000001e 57         jumpi       ; if (FUNC_SELECTOR == 0x12909485) goto 0xc9 address of bytecode
  1. 這是一個公共介面函式呼叫。如果函式選擇器（交易數據的前 4 個字節）為0x12909485，則跳轉到函式體。在下文中，我們可以找到公共函式的剩餘選擇器：
0x00000014 6312909485  push4 0x12909485 
... etc, only selector push commands...
0x00000020 63284d163c  push4 0x284d163c
0x0000002b 6342169e48  push4 0x42169e48
0x00000036 63488099a6  push4 0x488099a6
0x00000041 634fe437d5  push4 0x4fe437d5
0x0000004c 63559c390c  push4 0x559c390c
0x00000057 6368bb8bb6  push4 0x68bb8bb6
0x00000062 6372a571fc  push4 0x72a571fc
0x0000006d 6386c1ff68  push4 0x86c1ff68
0x00000078 6398ba676d  push4 0x98ba676d
0x00000083 63a7771ee3  push4 0xa7771ee3
0x0000008e 63adfaa72e  push4 0xadfaa72e
0x00000099 63cf528985  push4 0xcf528985
0x000000a4 63de8fa431  push4 0xde8fa431
0x000000af 63e814d1c7  push4 0xe814d1c7
0x000000ba 63f4ab9adf  push4 0xf4ab9adf
  1. 作為此字節碼與block_voting.sol具有相同介面的最終證明，讓我們通過“block_voting.sol”中的簽名重新計算選擇器，並與字節碼中找到的選擇器進行比較：
0x12909485 == web3.sha3("setVoteThreshold(uint256)").substr(0,10)
0x284d163c == web3.sha3("removeBlockMaker(address)").substr(0,10);
0x42169e48 == web3.sha3("voterCount()").substr(0,10);
0x488099a6 == web3.sha3("canCreateBlocks(address)").substr(0,10);
0x4fe437d5 == web3.sha3("voteThreshold()").substr(0,10);
0x559c390c == web3.sha3("getCanonHash(uint256)").substr(0,10);
0x68bb8bb6 == web3.sha3("vote(uint256,bytes32)").substr(0,10);
0x72a571fc == ??? not found...
0x86c1ff68 == web3.sha3("removeVoter(address)").substr(0,10);
0x98ba676d == web3.sha3("getEntry(uint256,uint256)").substr(0,10);
0xa7771ee3 == web3.sha3("isVoter(address)").substr(0,10);
0xadfaa72e == web3.sha3("canVote(address)").substr(0,10);
0xcf528985 == web3.sha3("blockMakerCount()").substr(0,10);
0xde8fa431 == web3.sha3("getSize()").substr(0,10);
0xe814d1c7 == web3.sha3("isBlockMaker(address)").substr(0,10);
0xf4ab9adf == web3.sha3("addVoter(address)").substr(0,10);

這是什麼，由你決定……

引用自：https://ethereum.stackexchange.com/questions/39804

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