Each individual assertion in your comment, & your intended implication, is false. Bitcoin, & close relatives, require a public ledger, but some altcoins use ot

Each individual assertion in your comment, & your intended implication, is false. Bitcoin, & close relatives, require a public ledger, but some altcoins use other technologies to prevent a publicly-readable ledger. But, Brave uses an off-blockchain technology ('ANONIZE': https://tech.cornell.edu/built/anonize/ https://tech.cornell.edu/built/anonize/) to tally attention without per-browser/per-user tracking. So, the use of their BAT tokens to net-out rewards, even though on the public Ethereum ledger, has no contradiction with the "tracker-free internet" goal.