Bismuth is using the sha224 “Heavy3” proof of work mining algorithm. Heavy3 is more resistant to FPGAs and ASICs because miners are required to hold a 1GB random binary file in memory. It requires a read from a random offset in a fixed lookup table, for each tested nonce.
Bismuth Hypernodes use a separate chain, with no currency but metrics - Key Performance Indicators (KPIs) - instead. Both chains are loosely coupled and operate in an almost independent manner, with very different rules. The Hypernodes operate on a Proof of Stake (PoS) chain, with no mining and no competition between the Hypernodes. They observe and store their KPIs in the PoS chain.
Total supply ca. 48 million Bismuth - and after block 7,100,000 2% tail emission
Simple, easy to understand, yet effective and considered good enough.
Store proofs instead of data. Use checkpoints, signatures and fingerprints.
When you have to trust something or someone, you know what/ who you have to trust.