Support block-dn as datasource

block-dn is a simple web server that connects to your existing Bitcoin full node to serve data from the time chain to fetch over HTTP(S). The goal is to serve the following data to Light Clients (e.g. mobile wallets).

We can fetch information about which blocks are considered to be the tip from it. Additionally, we can fetch full blocks and headers from it.

https://block-dn.org/