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<http://schema.org/thumbnailUrl>
<https://substackcdn.com/image/fetch/w_128,h_128,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com%2Fpublic%2Fimages%2F9aeb7e48-d23c-45bf-ab69-7ee1e7710e1b_1114x1114.png>
<https://bitcoineducation.substack.com/p/what-problem-is-bitcoin-solving>