Bitcoin and permissionless consensus

sources: real-world crypto ch. 12 https://pontem.network/posts/aptosbft-all-you-need-to-know-about-the-bft-consensus-in-aptos

before bitcoin BFT was a theoretical problem and the solutions impractical, but a permissionless network required to assume arbitrary/malicious nodes.

Proof of authority, proof of work, proof of stake

Conclusions

References