What are the basic requirements for developing a blockchain?
1. blockchain like Bitcoin, litecoin, and Ethereum is a protocol.
2. bitcoin written by Satoshi Nakamoto in C++.
3. reading whitepaper of bitcoin will help you to know most of the altcoins {
https://bitcoin.org/bitcoin.pdf}.
4. Ethereum is C++ and Python.
5. blockchain stack is JavaScript.
learning
C++, Python, JavaScript, and whitepaper of bitcoin giving you basic requirements for developing a blockchain.