DApp developers quickly realize that a complex and meaningful smart contract often needs data from off-chain resources. No centralized oracle can provide a secure and trustless solution. Data must be gathered from multiple sources by a decentralized network of miners incentivized with a utility token. All responses must be aggregated on-chain using a deterministic algorithm.
After writing a few smart contracts you quickly realize that you need an oracle to provide off-chain data like sports scores, currency prices, weather data, etc.
Today, only centralized oracles exist and this a major security risk for Dapp developers.
Concurrence is a smart contract fleet that accepts generic requests from developers, emits signaling events to a decentralized swarm of miners, collects simple responses, and delivers a currency-backed consensus on-chain.
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