UMIP 138 -Upgrade Skinny Optimistic Oracle

Mhairi · March 3, 2022, 3:23pm

This UMIP should be viewed exactly as UMIP-135 but with an updated contract address to account for security upgrades in the SkinnyOptimisticOracle.

github.com

UMAprotocol/UMIPs/blob/master/UMIPs/umip-138.md

## Headers
| UMIP-138   |                                     |
|------------|-------------------------------------|
| UMIP Title | Upgrade Skinny Optimistic Oracle    |
| Authors    | Nick Pai (nick@umaproject.org)      |
| Status     | Last Call                           |
| Created    | November 3, 2021                    |

## Summary (2-5 sentences)
This UMIP should be viewed exactly as UMIP-135 but with an updated contract address to account for security upgrades in the `SkinnyOptimisticOracle`.

## Motivation
UMIP-135 registered a new `SkinnyOptimisticOracle` for use in the [Across](https://medium.com/across-protocol/announcing-across-protocol-the-fastest-cheapest-and-most-secure-l2-to-l1-bridge-b64c66700e59) closed beta. However, this contract was always going have to be upgraded eventually since it was deployed pre-audit. This UMIP upgrades the `SkinnyOptimisticOracle` to a contract that includes some important fixes found during an external audit with OpenZeppelin.

## Technical Specification
To accomplish this upgrade, a few actions will need to be taken:
- A new `SkinnyOptimisticOracle` contract has been deployed at [0xeE3Afe347D5C74317041E2618C49534dAf887c24](https://etherscan.io/address/0xeE3Afe347D5C74317041E2618C49534dAf887c24).
- A transaction will need to be proposed to add this new address to the `Finder` contract under the name `SkinnyOptimisticOracle`. This is how other contracts will find the optimistic oracle and reference it.
- The `SkinnyOptimisticOracle` will need to be registered with the `Registry` so that it can make requests to the DVM.

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UMIP 138 -Upgrade Skinny Optimistic Oracle

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