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I Danmark er gevinster og tab ved køb og salg af bitcoins og andre kryptovalutaer som hovedregel skattepligtige, og man har pligt til at oplyse fortjenesten eller tabet til Skattestyrelsen, når man sælger kryptovalutaen.<ref>[https://skat.dk/skat.aspx?oid=8953 Bitcoins og anden kryptovaluta. Skat.dk, besøgt 4. april 2021.]</ref>
== Lovlighed ==
=== Reklameforbud ===
Annoncer for kryptovaluta er blevet midlertidigt forbudt på [[Facebook]],<ref name="wiredface">{{Cite news |last=Matsakis |first=Louise |date=2018-01-30 |title=Cryptocurrency scams are just straight-up trolling at this point |work=[[Wired (magazine)|Wired]] |url=https://www.wired.com/story/cryptocurrency-scams-ico-trolling/ |url-status=live |access-date=2 April 2018 |archive-url=https://web.archive.org/web/20180401171434/https://www.wired.com/story/cryptocurrency-scams-ico-trolling/ |archive-date=2018-04-01}}</ref> [[Google]],<ref>{{Cite web | url=https://investmenthoney.com/best-gold-investment-companies-how-and-top-ratings/| title=Janet Yellen, Bitcoin And Crypto Fearmongers Get Pushback From Former CIA Director | accessdate=2019-04-11}}</ref> [[Twitter]],<ref name="ToISW">{{Cite news |last=Weinglass |first=Simona |date=2018-04-28 |title=European Union bans binary options, strictly regulates CFDs |work=[[The Times of Israel]] |url=https://www.timesofisrael.com/european-union-bans-binary-options-strictly-regulates-cfds/ |url-status=live |access-date=2018-04-02 |archive-url=https://web.archive.org/web/20180401084746/https://www.timesofisrael.com/european-union-bans-binary-options-strictly-regulates-cfds/ |archive-date=2018-04-01}}</ref> [[Bing]],<ref name="bing51418">{{Cite web |last=Alsoszatai-Petheo |first=Melissa |date=2018-05-14 |title=Bing Ads to disallow cryptocurrency advertising |url=https://advertise.bingads.microsoft.com/en-us/blog/post/may-2018/bing-ads-to-disallow-cryptocurrency-advertising?feed=blogposts |url-status=live |archive-url=https://web.archive.org/web/20180517152920/https://advertise.bingads.microsoft.com/en-us/blog/post/may-2018/bing-ads-to-disallow-cryptocurrency-advertising?feed=blogposts |archive-date=2018-05-17 |access-date=2018-05-16 |publisher=Microsoft}}</ref> [[Snapchat]], [[LinkedIn]] og [[MailChimp]].<ref name="3key">{{Cite news |last=French |first=Jordan |date=2018-03-02 |title=3 Key Factors Behind Bitcoin's Current Slide |publisher=theStreet.com |url=https://www.thestreet.com/story/14541510/1/whats-behind-bitcoin-price-slump.html |url-status=live |access-date=2018-03-02 |archive-url=https://web.archive.org/web/20180403051718/https://www.thestreet.com/story/14541510/1/whats-behind-bitcoin-price-slump.html |archive-date=2018-03-03 |ref='}}</ref> Kinesiske internetplatforme Baidu, Tencent og Weibo har også forbudt bitcoin-reklamer. Den japanske platform [[Line]] og den russiske platform [[Yandex]] har lignende forbud.<ref>{{Cite news |last=Wilson |first=Thomas |date=28 March 2018 |title=Twitter and LinkedIn ban cryptocurrency adverts – leaving regulators behind |work=Independent |agency=[[Reuters]] |url=https://www.independent.co.uk/news/business/analysis-and-features/twitter-ban-cryptocurrency-adverts-regulators-bitcoin-facebook-social-media-a8277176.html |url-status=live |access-date=2018-03-03 |archive-url=https://web.archive.org/web/20180404074502/https://www.independent.co.uk/news/business/analysis-and-features/twitter-ban-cryptocurrency-adverts-regulators-bitcoin-facebook-social-media-a8277176.html |archive-date=2018-04-04}}</ref>
=== Darknet markeder ===
Egenskaber for kryptovalutaer gav dem popularitet i applikationer som en sikker havn i bankkriser og betalingsmidler, hvilket også førte til brug af kryptovaluta i kontroversielle omgivelser i form af online sorte markeder, såsom Silk Road.<ref name="taxstatus">{{Cite news |last=Rushe |first=Dominic |date=25 March 2014 |title=Bitcoin to be treated as property instead of currency by IRS |work=The Guardian |url=https://www.theguardian.com/technology/2014/mar/25/bitcoin-property-currency-irs-rules |url-status=live |access-date=2018-02-08 |archive-url=https://web.archive.org/web/20160601151330/https://www.theguardian.com/technology/2014/mar/25/bitcoin-property-currency-irs-rules |archive-date=2016-06-01}}</ref><ref>{{Cite web | url=https://investmenthoney.com/how-to-invest-in-gold-for-beginners-online/| title=IRS has begun sending letters to virtual currency owners advising them to pay back taxes| accessdate=2021-02-27}}</ref> Den originale Silk Road blev lukket ned i oktober 2013, og der har været yderligere to versioner i brug siden da. I året efter den indledende lukning af [[Silk]] Road steg antallet af fremtrædende mørke markeder fra fire til tolv, mens mængden af narkotikafortegnelser steg fra 18.000 til 32.000.<ref name=":1">ALI, S, T; CLARKE, D; MCCORRY, P;
Bitcoin: Perils of an Unregulated Global P2P Currency
[By S. T Ali, D. Clarke, P. McCorry
Newcastle upon Tyne: Newcastle University: Computing Science, 2015.
(Newcastle University, Computing Science, Technical Report Series, No. CS-TR-1470)</ref>
== Andre kryptovalutaer ==
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