BaseHeader returns the base BTC header of the chain. This header is defined on genesis.

BTCHeaderInfoResponse is a structure that contains all relevant information about a BTC header response

• Full header as string hex.
• Header hash for easy retrieval as string hex.
• Height of the header in the BTC chain.
• Total work spent on the header. This is the sum of the work corresponding to the header Bits field and the total work of the header.