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(HolderAddress, SpenderAddress, Amount) -> StateChange
Deduct a pre-approved transfer budget from a third-party spender before transferring tokens on behalf of a holder.
Problem it solves
Delegated spending requires checking and updating authorization balances to prevent double-spending.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.