Comparison of error-diffusion vs ordered dithering using an 8-colour irregular palette. Left to right: original image, error-diffusion, ordered.
Don't worry. We de-duplicate non-anonymous signatures automatically, and anonymous signatures within 24 hours (before personal data is deleted). For anonymous signatories beyond 24 hours, we cannot verify there are no duplicates, though there is one human who manually reads all signatures and will try hard to notice and correct any abuse of the system.
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Water and dust resistance rating
As with crypto-currency, records of who owns what are stored on a ledger that is maintained by thousands of computers around the world. These records can’t be forged because the whole system operates on an open-source network.
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災後有宏福苑居民自發實名聯署，收集到407戶街坊意見，其中394戶同意重建，13戶反對。小陳是有份簽署的其中一戶，他說目前欠缺一個類似有代表性的法人代表討論。，推荐阅读同城约会获取更多信息
Tony Jolliffe BBC