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I have written an online tool to check who downvoted you in the last 365 days.
https://helloacm.com/tools/steemit/who-downvote-you/
Enter your STEEM ID, and press Enter you should get a list of downvoters very quickly.
The API is also made public free to use so that you can integrate in your tools/applications.
被人踩是不是不太爽？最不爽的是不是别人踩了你，你却不知道？这下好了，花了一小时，做了以下在线STEEMIT 工具，很方便，谁踩了你，一清二楚。
https://helloacm.com/tools/steemit/who-downvote-you-steemit/
输入ID，按回车即可查询：
同时，该功能的API 已经提供，返回JSON数据， 比如 可以很方便的集成到 @oflyhigh O 哥的公众号 steemit 上。
// Later, it may be reposted to my blogs: justyy.com, helloacm.com and codingforspeed.com 稍后同步到我的中文博客和英文计算机博客。
Originally published at https://steemit.com Thank you for reading my post, feel free to Follow, Upvote, Reply, ReSteem (repost) @justyy which motivates me to create more quality posts.
原文首发于 https://Steemit.com 首发。感谢阅读，如有可能，欢迎Follow, Upvote, Reply, ReSteem (repost) @justyy 激励我创作更多更好的内容。
@justyy 是CN 区的点赞机器人，对优质内容进行点赞，只要代理给 @justyy 每天收利息(100 SP 每天0.04 SBD)并且能获得一次相应至少2倍的点赞，可以认为是VP 200%+ ，详细请看：
欢迎你发表你的见解和看法，特别有意思的评论我可能会奖励你1 SBD哦。
Interesting Comments might be rewarded with 1 SBD.