Tags: blockchain 

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I am sorry that I have not been able to complete this writeup in English. I tried to use the standard Chinese in the text to facilitate translation of the software.

[https://lorexxar.cn/2018/11/12/hctf2019_contract_wp/#bet2loss](https://lorexxar.cn/2018/11/12/hctf2019_contract_wp/#bet2loss)

Original writeup (https://lorexxar.cn/2018/11/12/hctf2019_contract_wp/#bet2loss).