Audius Reward Manager will be a program which allows trusted node operators (identified by their Ethereum Addresses) to distribute rewards to the users.
Node operators (or senders) will be using their own business logic to identify which users need to be rewarded with tokens. Each reward can be sent to the user only once, so there will be a unique identifier (called specifier) ensuring just a single payout. Also the reward payout can happen only if several senders agree on it (3 for example).
There is also a separate type of the sender called bot oracle. This will be a sender operated by the Audius and while any 3 senders can sign the reward transfer, all transfers also require a signature by the bot oracle and messages from the senders also should specify the same bot oracle address.
After signatures from 3 senders and bot oracle are verified the tokens are transferred and we create and maintain a transfer record which will store an account in the blockchain derived from the specifier ensuring no other transfer with the same ID happens again.
All the signatures are verified using secp256k1 instruction (several of them for several signatures).