ACon$^2$: Adaptive Conformal Consensus for Provable Blockchain Oracles. (arXiv:2211.09330v1 [cs.CR])

Blockchains with smart contracts are distributed ledger systems which achieve
block state consistency among distributed nodes by only allowing deterministic
operations of smart contracts. However, the power of smart contracts is enabled
by interacting with stochastic off-chain data, which in turn opens the
possibility to undermine the block state consistency. To address this issue, an
oracle smart contract is used to provide a single consistent source of external
data; but, simultaneously this introduces a single point of failure, which is …

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