# PXN  合约分析 

**Published by:** [wellfrog](https://paragraph.com/@wellfrog/)
**Published on:** 2022-05-11
**URL:** https://paragraph.com/@wellfrog/pxn

## Content

合约地址 https://rinkeby.etherscan.io/address/0x3201fe090e70bd464bc93469545be5278595d1f5#code合约类型ERC721AOwnable关键数量该项目共计 10k 个nft白单可以mint 6k白单价0.35e荷兰拍的数量 4k荷兰拍起拍价 2e，之后每隔15分钟降价 0.05e，白单mint价格 0.35e合约审计分析Reentrancy用了_safeMint来防止了Reentrancy关键的逻辑都使用了require来进行校验Ownership Take Over继承使用了Ownable合约。在需要的地方都做了限制Timestamp代码中有timestamp相关的限制Contract interact使用了callerIsUser来防止合约调用业务逻辑分析mintDutchAuction()通过DA_ACTIVE来开启判断数量不超过4000个mintWL()在开启whitelist之后24小时之后就不能mint了teamMint()必须要在whitelist开启24小时之后才能操作devMint()require( block.timestamp >= WL_STARTING_TIMESTAMP, "WL has finished!" );上面这个的提示有点奇怪。其他都还好

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