Poly Network攻击学习文章

合约代码：
https://github.com/polynetwork/eth-contracts/blob/master/contracts/core/cross_chain_manager/data/EthCrossChainData.sol
https://github.com/polynetwork/eth-contracts/blob/master/contracts/core/cross_chain_manager/logic/EthCrossChainManager.sol
服务代码：
https://github.com/polynetwork/ont-relayer/blob/master/service/service.go

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学习文章：
https://zhuanlan.zhihu.com/p/398941126
https://www.bimama.com/news/8400.html