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Here is the link to one of the answers that mentioned Hacker News, https://www.zhihu.com/question/330671869/answer/725494839

So you excluded Japan because there is an alternative mechanism that can cause low reporting rate. How can you be sure other countries don't have something similar (alternative mechanisms) that may account for the low reporting rate?

One thing missing form the design is to go back and check the status of the wallets. If most are just put in some lost & found boxes waiting for the owner to come and claim, then a low reporting rate cannot be considered a measure of honesty.