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.
DAEX is a clearing solution for centralized cryptocurrency trading exchanges. Its clearing service is based on distributed ledger technology. Clearing and settlement rules are preprogrammed into clearing smart contracts on the DAEX clearing chain. The clearing process is automatic without people’s interference. The objectivity of clearing is guaranteed by the consensus mechanism on the clearing chain. Also, customers’ digital assets are registered and stored on the DAEX’s clearing chain. No other institutions or individuals can access these assets without the owner’s permission.