Watchers

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  Nikole Kasper

  https://bitcoin-review.net/%eb%ac%b4%ec%a7%81%ec%9e%90%eb%8f%84-%ea%b0%80%eb%8a%a5%ed%95%9c-%eb%8c%80%ec%b6%9c%ec%9d%98-%ec%83%88%eb%a1%9c%ec%9a%b4-%ec%9e%a5/