Proof-of-Background is really a time-based consensus system that develops a historical report of an action depending on its posture while in the blockchain, that is represented by a hash tree. Censorship occurs when any user or application is prevented from performing either of these things, for just about any cause. https://technologybot.co.uk/unlocking-the-future-introducing-syncus-sol-the-next-big-solana-token-in-sol-presale/