https://en.wikipedia.org/wiki/Bitcoin
https://en.wikipedia.org/wiki/Bitcoin_network
https://en.wikipedia.org/wiki/Bitcoin_Cash
https://en.wikipedia.org/wiki/Bitcoin_scalability_problem
https://en.wikipedia.org/wiki/Bitcoin_Foundation
Crypto jacking and data mining – Microsoft Community
Block senders or mark email as junk in Outlook.com – Outlook