Smart contracts on Ethereum are fully self contained and any information or access to off-chain data is restricted. Tellor solves this problem by creating a system where parties can request the value of an off-chain data point (e.g. ETH/USD) and miners compete to add this value to an on-chain data bank, accessible by all Ethereum smart contracts. Inputs to a data series are secured by a network of staked miners. The main Tellor smart contract creates a time series of each requested data series and aims to become the standard source of high value data for decentralized applications. This oracle, “Tellor”, utilizes similar incentive mechanisms to other cryptocurrency systems through the issuance of Tellor’s token, Tributes, that are used to request a particular data series from miners.
AERGO is an open platform that allows businesses to build innovative applications and services by sharing data on a trustless and distributed IT ecosystem. With the ability to deploy on either public or private blockchain networks, AERGO gives businesses the flexibility in developing and deploying blockchain applications with unparalleled speed, scalability and performance. AERGO is designed as a flexible, plugin-based smart contract infrastructure. Client-actors can execute smart contracts written for the Ethereum Virtual Machine or AergoSQL. The AERGO network will be backboned by github-like public and permissioned repositories of Distributed Directories (DD). Implementing Smart Oracles, AERGO will also allow smart contracts to consume data with external services or internal databases and trigger events.