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There is no referral scheme for Keybase that I know of. I use Brave, but I suspect I am missing earning opportunities on that. I see you can pay Steempeak with it, but I don't have enough to use. How do you earn BAT?

It just appears in your Brave wallet monthly based on your activity. "Activities" include;

  • Just using the browser
  • Opting to watch suggested ads
  • Other people using your referrer code to download Brave

There's also a learn to earn for BAT on Coinbase.