Watchers

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  Colin Tovell

  https://bitcoin-review.net/%ec%95%88%ec%a0%84%ed%95%9c-%ed%86%a0%ed%86%a0%ec%82%ac%ec%9d%b4%ed%8a%b8-%eb%a8%b9%ed%8a%80-%ec%97%86%eb%8a%94-%ec%82%ac%ec%9d%b4%ed%8a%b8%ec%9d%98-%ec%84%a0%ed%83%9d-%ea%b8%b0%ec%a4%80/