The 21 Bitcoin Computer is a very versatile device that can be used to host some innovative projects relying on Bitcoin payments. Ranging from selling files in exchange for Bitcoin to creating notary services, or even creating an online ad network, the possibilities are virtually endless. Moreover, the 21.co platform is available for download on regular computers as well...
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https://btcmanager.com/news/tech/21-sof ... f-promise/
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