Update Backup Oracle to Tellor

Benefits Specific to Tellor:

Data Accuracy- All the reported data is provided by explicitly staked reporters and can be disputed. This provides crypto-economic incentives to keep data honest and accurate.

Crypto-Economic Liveness - Especially important for a fallback oracle, the Tellor system utilizes a tipping mechanism ensuring a user can directly control how quickly they can get the data they need; as reporters are incentivized by the rewards attached to a requested piece of data. In the event where a fallback parameter is triggered, the flexibility and speed of this data is crucial.

Fully Decentralized- the Tellor core team has relinquished control of the admin key. This directly addresses the oracle risk currently known to the Tribe regarding the “decentralization trade-off due to the fact that Chainlink has an admin multisig”. Additionally, anyone can be a reporter. Even if all of our reporters were to drop offline, you can stake tokens yourself and report a price, meaning there’s no way to shut it down or censor a price.

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