Block header
A block header is kind of like a TLDR the the new model of on-chain-based data architecture. The goal of a block header is to keep everything organized and the system running efficiently.
What is a nonce?
A nonce plays a critical role in crypto mining. By itself, a nonce is generally forgettable — it’s just a random number after all. In fact the word nonce is derived from its meaning or “number only used once.”