Question: What is the difference between Bitcoin which start with capital letter B and bitcoin which start with small letter b.

Answer : Indeed, there's a difference between Bitcoin with a capital 'B' and bitcoin with a lowercase 'b'. Here's the difference explained in 5 points.

1. "Bitcoin" with a capital "B" refers to Bitcoin the protocol: This is the complex mechanism that allows the existence of a decentralized digital ledger which records transactions across many computers to ensure any involved record cannot be altered, retroactively.

2. "Bitcoin" also refers to the entire system of miners, node operators, developers, and platforms that support and secure the network.

3. "Bitcoin" signifies the broader concept and vision of decentralized peer-to-peer digital money, as originally set forth in the Bitcoin whitepaper by Satoshi Nakamoto.

4. "bitcoin" with a lowercase "b" is the specific digital currency or token that operates within the Bitcoin network. It is what is traded, bought, and sold.

5. "bitcoin" is the unit used when implementing a transaction within the Bitcoin blockchain. For example, if you were to buy or sell some Bitcoin, the amount would be denoted in "bitcoin".

So in summary, a capital "B" Bitcoin refers to the broader system and network, while a lowercase "b" bitcoin refers to the specific units of currency within that system.