OAO: Onchain AI Oracle

OAO (onchain AI oracle), powered by opML (optimistic machine learning) on Ethereum, brings ML model onchain.

Architecture and Workflow

The specific architecture of OAO is as follows. The user's contract can initiate an AI request by calling OAO, OAO will publish the request to opML node for processing, and then OAO will return the AI result to the user.

In terms of workflow, we need to break down the explanation into two parts.

Usage process:

1. The user contract sends the AI request to OAO on chain, by calling requestCallback function on the OAO contract.

2. Each AI request will initiate an opML request.

3. OAO will emit a requestCallback event which will be collected by opML node.

4. opML node will run the AI inference, and then upload the result on chain.

   Challenge process:

   1. The challenge window starts right after step 4 in previous section.
   2. During the challenge period, the opML validators (or anyone) will be able to check the result and challenge it if the submitted result is incorrect.
   3. If the submitted result is successfully challenged by one of the validators, the submitted result will be updated on chain.
   4. After the challenge period, the submitted result on chain is finalized (results can not be mutated).

5. When the result is uploaded or updated on chain, the provided result in opML will be dispatched to the user's smart contract via its specific callback function.

Deployment

Here are the OAO contracts deployed onchain:

ETH Sepolia

contract	Sepolia Address
OAO	0x0A0f4321214BB6C7811dD8a71cF587bdaF03f0A0
prompt	0xe75af5294f4CB4a8423ef8260595a54298c7a2FB
SimplePrompt	0x696c83111a49eBb94267ecf4DDF6E220D5A80129

ETH Mainnet

contract	Mainnet Address
OAO	0x0A0f4321214BB6C7811dD8a71cF587bdaF03f0A0
prompt	0xb880D47D3894D99157B52A7F869aB3B1E2D4349d
SimplePrompt	0x61423153f111BCFB28dd264aBA8d9b5C452228D2

Optimism Sepolia

contract/EOA	Sepolia Address
OAO	0x0A0f4321214BB6C7811dD8a71cF587bdaF03f0A0
prompt	0x3c8Cd1714AC9c380702D160BE4cee0D291Eb89C0
SimplePrompt	0xf6919ebb1bFdD282c4edc386bFE3Dea1a1D8AC16

Optimism Mainnet

contract/EOA	Mainnet Address
OAO	0x0A0f4321214BB6C7811dD8a71cF587bdaF03f0A0
prompt	0xC3287BDEF03b925A7C7f54791EDADCD88e632CcD
SimplePrompt	0xBC24514E541d5CBAAC1DD155187A171a593e5CF6

Currently, you can use the onchain ML model by initiating an onchain transaction by interacting with Prompt contract. We have uploaded two models to OAO.

modelID	model
11	llama
50	Stable Diffusion (SD)

Usage

1. Inherit AIOracleCallbackReceiver in your contract and bind with a specific OAO address:

   constructor(IAIOracle _aiOracle) AIOracleCallbackReceiver(_aiOracle) {}

2. Write your callback function to handle the AI result from OAO. Note that only OAO can call this function:

   function aiOracleCallback(uint256 requestId, bytes calldata output, bytes calldata callbackData) external override onlyAIOracleCallback()

3. When you want to initiate an AI inference request, call OAO as follows:

   aiOracle.requestCallback(modelId, input, address(this), gas_limit, callbackData);