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oracles
tl;dr
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price oracles are any defi tool showing an asset's price. they can either on or off chain.
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oracles should provide a trustless way of getting extrinsic (off-chain) information, and some key functions such as: collecting data from an off-chain source, transfering the data on-chain with a signed message, and making the data available by putting it in a smart contract’s storage.
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oracle exploitation can generate profit opportunities (e.g., through arbitrage or liquidation, multi-block)