https://getcrypto.info/

https://www.livecoinwatch.com/

https://bitscreener.com/

https://docs.google.com/document/u/1/d/1UiEzvVxJ7yVeQ3Kbxkx3OlknA0XDYWOu9rH-77LtF2Q/mobilebasic

https://bitcoinedge.org/tutorials

http://yogh.io/#home:

https://github.com/JornC/bitcoin-transaction-explorer

https://news.ycombinator.com/item?id=14659775

https://masternodes.online/

https://sky2learn.com/Bitcoin-and-Cryptocurrency-Online-Courses-and-Tutorials-Fundamentals-to-Developments.html

https://bitcoin.org/en/developer-examples#simple-raw-transaction