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.
Nebulas is a next generation public blockchain, aiming for a continuously improving ecosystem. Based on its blockchain valuation mechanism, Nebulas proposes future-oriented incentive and consensus systems, and the ability to self-evolve without forking. Many in the crypto community are referring to Nebulas as “the new Google”. While the two are similar in a sense, they hold different use cases. Google is intended for day to day internet information searches, while Nebulas focuses on searches among decentralized applications (DApps), smart contracts, and user’s blockchain assets. Nebulas is being built on a decentralized search framework with open-source algorithms, verifiable computing, and distributed data stores.” Nebulas has three core features of its tech such as Nebulas Rank (NR), it is an Open source, core ranking algorithm based on “liquidity, propagation of users’ assets, and the interactivity between users.” and Nebulas Force (NF): “Nebulas Force (NF) provides the Nebulas blockchain & its distributed applications built on top, the capability to self-evolve”. Nebulas’s official website shows an international team of 14 core members, including Hitters Xu, founder and CEO of Nebulas (who also happens to be the founder of AntShares, now known as NEO). Xu is considered a pioneer in the blockchain industry, founding BitsClub (the very first Blockchain/Bitcoin community in China) in 2013 as well as popular ICO platform ICO 365. He also founded the crypto funds firm, FBG capital. On top of that, he directed an Alibaba financial arm (Ant Financial’s Blockchain Platform) and aided Google’s Search & Anti-Fraud team.