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.
MintCoin is a new Proof of Work (POW) / Proof of Stake (POW) hybrid cryptocurrency coin. It's objective is to become the next innovative, secure, and energy efficient cryptocoin in the market. MintCoin is distributed using a fast POW distribution mechanism, and after 5 weeks, it becomes a pure POS coin. This makes the coin completely energy efficient in order to sustain itself, not having to depend on resource intensive mining rigs. MintCoin now runs on 100% Proof-of-Stake to secure the network. After the year 2016, stakers will receive a fixed 5% indefinitely as reward for securing the network. PoS variable interests: - 1st year: 20% - 2nd year: 15% - 3rd year: 10% - 4th and subsequent years: 5% MintCoin is often compared with its close counterpart - Peercoin and NXT