※ 引述《MACD (MACD)》之铭言：
: 嗨!大家好，我最喜欢讲技术的文章了。
: 最近几个月都研究FlashLoan的技术，也略有心得，这篇来分享一下。
: 我主力目前是DEX之间的币对价差，MEV黑森林中的一小部分，看到有人想当伸手牌，我大
: 概分享几个关键字。DYOR
: 好了，之前发文有人说怎么没有作业，我这不就出作业了，我花了点时间写个合约给大家
: 用，flashloan的，现成的大家都可以用，很棒吧，不过我有留一个有趣的彩蛋在里面，希
: 望大家可以发现，发现的人没有奖品，谢谢。
: 彩蛋可以透过我的测试交易发现。
: 如果你可以完成作业，恭喜你，前端操作合约技能+1，尤其最近AC不玩了，这技能值得你
: 花心力点一下。
: 作业完成目标：参照我的测试tx，跟我部属的合约互动，发起一笔你自己的flashloan。
: TIP:因为是flashloan，你不用做任何合约授权，你只需要付gas fee，这样大家放心了吧
: ，你可以另外生成一个帐号放点gas fee跟合约做安全的神魂交流。
: TIP2:如果你发起的flashloan无法还款，那交易会失败并出现以下错误讯息
: Not enough amount to return loan会记录在tx里时刻的羞辱你喔。
: 部属链:polygon
: 测试tx:0x8be86f4af8e44d57ebdca4eccff335925abeb1990f9727d9907273bc078af0a3
: 合约地址 0xcFb2168Bad58D505aC0D857017CD0cbF7408E81C
恕删......
首先谢谢ＭＡＣＤ大,常常分享宝贵经验跟技术给大家..
行情不好的时候,就是静下心来开始学习最好的时候..反正也被割得差不多了..XD
主要还是冒昧想请问M大作业问题..因为 TIP2..果然顺利达成
我的测试tx: 0x25c394257baff2e6d2bd0abecaae7ed74faa403d1895435fdc6691518b984455
原本ＭＡＣＤ大的 TX 分析如下
{
hash: '0x8be86f4af8e44d57ebdca4eccff335925abeb1990f9727d9907273bc078af0a3',
from: '0xDcc43055f22A87b0041F368d158a63e7dD7ff4db',
to: '0xcFb2168Bad58D505aC0D857017CD0cbF7408E81C',
gasPrice: 42680000000,
gasLimit: 483277,
nonce: 6,
blockNumber: 25702154
}
TransactionDescription {
args: [
'0x581c7DB44F2616781C86C331d31c1F09db87A746',
BigNumber { _hex: '0x03e8', _isBigNumber: true },
'0xc2132D05D31c914a87C6611C10748AEb04B58e8F',
'0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619',
'0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff',
'0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506',
flashLoanPool: '0x581c7DB44F2616781C86C331d31c1F09db87A746',
loanAmount: BigNumber { _hex: '0x03e8', _isBigNumber: true },
loanToken: '0xc2132D05D31c914a87C6611C10748AEb04B58e8F',
metaToken: '0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619',
router1: '0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff',
router2: '0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506'
],
我自己的发起 tx 如下
{
hash: '0x25c394257baff2e6d2bd0abecaae7ed74faa403d1895435fdc6691518b984455',
from: '0xafF61F8B106CFc5CAb922FCbE9ce87292C980203',
to: '0xcFb2168Bad58D505aC0D857017CD0cbF7408E81C',
gasPrice: 43000000000,
gasLimit: 483277,
nonce: 0,
blockNumber: 30159826
}
TransactionDescription {
args: [
'0x581c7DB44F2616781C86C331d31c1F09db87A746',
BigNumber { _hex: '0x03e8', _isBigNumber: true },
'0xc2132D05D31c914a87C6611C10748AEb04B58e8F',
'0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619',
'0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff',
'0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506',
flashLoanPool: '0x581c7DB44F2616781C86C331d31c1F09db87A746',
loanAmount: BigNumber { _hex: '0x03e8', _isBigNumber: true },
loanToken: '0xc2132D05D31c914a87C6611C10748AEb04B58e8F',
metaToken: '0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619',
router1: '0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff',
router2: '0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506'
],
不知道哪边出了问题? 还是必须自己架设 local polygon node? 以上我是先用
ALCHEMY_POLYGON_RPC 挡挡先...
另外追了一下ＭＡＣＤ大的 TX log 中
[SC]
0xcfb2168bad58d505ac0d857017cd0cbf7408e81c
[INPUT RAW DATA]
0x53485e5a
0x000000000000000000000000581c7db44f2616781c86c331d31c1f09db87a746 <== DLP
0x00000000000000000000000000000000000000000000000000000000000003e8 <==
LoanAmount
0x000000000000000000000000c2132d05d31c914a87c6611c10748aeb04b58e8f <==
(POS)USDT
0x0000000000000000000000007ceb23fd6bc0add59e62ac25578270cff1b9f619 <== WETH
0x000000000000000000000000a5e0829caced8ffdd4de3c43696c57f7d7a678ff <==
QuickSWAP:Router
0x0000000000000000000000001b02da8cb0d097eb8d57a175b88c7d8b47997506 <==
SushiSwap:Router
内部 18 Logs
0xf6422b997c7f54d1c6a6e103bcb1499eea0a7046 <== Uniswap V2
0xc2755915a85c6f6c1c0f3a86ac8c058f11caa9c9 <== SushiSwap LP Token (SLP)
0x0000000000000000000000000000000000001010 <== Polygon: MATIC Token
[log 129] USDT, DLP -> SC (0x3e8= 1000 = 0.001 USDT)
[log 130] USDT, SC -> QuickSWAP:Router (ff..fff)
[log 131] USDT, SC -> Uniswap V2 (0x3e8=1000= 0.001 USDT)
[log 132] USDT, SC -> QuickSWAP:Router (ff..c17)
[log 133] WETH, Uniswap V2 -> SC (0x5cc1df6fc1=0.000000398389637057 WETH ~
2510.105452)
[log 134] Uniswap V2 (0x10fc9e0097ca0d88257, 0xb6950491ea2)
[log 135] Uniswap V2 (QuickSWAP:Router, SC)(0, 0x3e8, 0x5cc1df6fc1, 0)
[log 136] WETH, SC -> SushiSwap:Router (ff..ffff)
[log 137] WETH, SC -> SLP (0x5cc1df6fc1)
[log 138] WETH, SC -> SushiSwap:Router (ff..a33e20903e)
[log 139] USDT, SLP -> SC (0x3e3= 995 = 0.0095 USDT)
[log 140] SLP , (0x2a2df0342d25923b9b, 0x1c5dedefcb0)
[log 141] SLP, SushiSwap:Router -> SC (0x5cc1df6fc1, 0, 0, 0x3e3)
[log 142] USDT, SC -> DLP (0x3e8)
[log 143] USDT, SC -> Caller (0x1b97=7063 = 0.007063 USDT)
[log 144] USDT, SC -> Caller (0x1b97=7063 = 0.007063 USDT)
[log 145] DLP , (SC, SC, 0, 0x3e8)
[log 146] MATIC,(MATIC, Caller, ???)(0x32509143f829da, 0x10803618b77c1606,
0x147e1fff4a5616db85d30, 0x104de5877383ec2c, 0x147e20026f5f2b1b0870a)
对应到 8 Actions
[log 129] ==> From 0x581c7db44f2616781c86c331d31c1f09db87a746 To
0xcfb2168bad58d505ac0d857017cd0cbf7408e81c For 0.001 ($0.00) (PoS) Tether...
(USDT)
[log 131] ==> From 0xcfb2168bad58d505ac0d857017cd0cbf7408e81c To
0xf6422b997c7f54d1c6a6e103bcb1499eea0a7046 For 0.001 ($0.00) (PoS) Tether...
(USDT)
[log 133] ==> From 0xf6422b997c7f54d1c6a6e103bcb1499eea0a7046 To
0xcfb2168bad58d505ac0d857017cd0cbf7408e81c For 0.000000398389637057 ($0.00)
Wrapped Ethe... (WETH)
[log 137] ==> From 0xcfb2168bad58d505ac0d857017cd0cbf7408e81c To
0xc2755915a85c6f6c1c0f3a86ac8c058f11caa9c9 For 0.000000398389637057 ($0.00)
Wrapped Ethe... (WETH)
[log 141] ==> From 0xc2755915a85c6f6c1c0f3a86ac8c058f11caa9c9 To
0xcfb2168bad58d505ac0d857017cd0cbf7408e81c For 0.000995 ($0.00) (PoS)
Tether... (USDT)
[log 142] ==> From 0xcfb2168bad58d505ac0d857017cd0cbf7408e81c To
0x581c7db44f2616781c86c331d31c1f09db87a746 For 0.001 ($0.00) (PoS) Tether...
(USDT)
[log 143] ==> From 0xcfb2168bad58d505ac0d857017cd0cbf7408e81c To
0xdcc43055f22a87b0041f368d158a63e7dd7ff4db For 0.007063 ($0.01) (PoS)
Tether... (USDT)
[log 144] ==> From 0xcfb2168bad58d505ac0d857017cd0cbf7408e81c To
0xdcc43055f22a87b0041f368d158a63e7dd7ff4db For 0.007063 ($0.01) (PoS)
Tether... (USDT)
应该是我太笨蛋..还是看不出那边是彩蛋ㄟ.(胡乱猜一下..多了Uniswap V2 ?)
斗胆请ＭＡＣＤ大明示, 非常感谢~~