I've written a blog post on Bitcoin's core protocol. It's not for everyone but people who know how to code and looking for an introduction to the core protocol might find it helpful.

Link: https://www.tzionis.com/bitcoin-protocol-in-45-minutes

PS: Every section comes with a minimal Node.js script that you can run locally and play around

I created a bunch of Node.js scripts that create and broadcast testnet transactions. It's meant for newcomers that have some programming experience to get a grisp of how the core protocol works. The scripts re-implement the core TCP protocol in a minimal way and you can try them straight within the blog post.

I'm sharing it here for some feedback before sharing it on Reddit and other dev communities that are not familiar with the core protocol.

Link: https://www.tzionis.com/bitcoin-protocol-in-45-minutes

PS: Although I'm not saving anything, addresses you create on the site should be considered compromised