Earnings
An exam token is paid the author's share of every run that certifies a harness on its exam, every paid question and every bounty; a harness token is paid the owner's share. The contract holds those earnings per token and pays them to whoever owns the token when they withdraw, so the income moves with the NFT.
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Enter a token id to read get_earnings(token_id) and get_token_history(token_id), an account id to read get_balance(account_id), or both.