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What is the difference between MAC and HMAC?

In reference to this question, what are the “stronger security properties” that HMAC provides over MAC. I got that MAC requires an IV whereas HMAC doesn’t. I also understood that MAC may reveal information about plaintext in contrast to HMAC. Is my understanding right?

What are other security properties of MAC and HMAC?

Algorithm behind Bitcoin Core’s hashes/s metric

The call bitcoin-cli getmininginfo returns a metric networkhashps among others. It shows how many hashes the entire Bitcoin network generates per second. This metric however, is not directly stored within the Blockchain, resp. it is not communicated over the gossip network. Consequently it must be derived; I assume that it takes the difficulty and also::Listen

The call bitcoin-cli getmininginfo returns a metric networkhashps among others. It shows how many hashes the entire Bitcoin network generates per second.

This metric however, is not directly stored within the Blockchain, resp. it is not communicated over the gossip network. Consequently it must be derived; I assume that it takes the difficulty and also checks the time it took between blocks.

But how does the algorithm behind this exactly look like?

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What is the difference between MAC and HMAC?

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