Spendcoin is a decentralized cryptocurrency that powers the Spend.com ecosystem of products. Spend has two financial services products, the Spend App and Spend Card, which are products of Spend.com that give our users a multi-currency digital wallet that they are able to store fiat and digital assets/currencies. They will be able to buy, sell, store, manage, and exchange all supported currencies within the app. The Spend App is available on iOS, Android, or Web based devices. The Spend prepaid debit card allows users to send fiat based currencies loaded onto it via the Spend App anywhere that accepts MasterCard. Spend Foundation is also launching a decentralized educational platform called Blockchain University (bu.org). Blockchain University is designed to run off our open-source blockchain called Cross Ledger which incorporates a hybrid delegated proof-of-stake consensus model called Proof-of-Support. Proof-of-Support creates a learning based ecosystem that rewards those users who support and answer the knowledge base and Quora style system. Spendcoin will be the native digital currency powering the platform. Blockchain University and Cross Ledger are planned to launch in 2019.
The Cosmos network consists of many independent, parallel blockchains, called zones, each powered by classical Byzantine fault-tolerant (BFT) consensus protocols like Tendermint (already used by platforms like ErisDB). Some zones act as hubs with respect to other zones, allowing many zones to interoperate through a shared hub. The architecture is a more general application of the Bitcoin sidechains concept, using classic BFT and Proof-of-Stake algorithms, instead of Proof-of-Work.Cosmos can interoperate with multiple other applications and cryptocurrencies, something other blockchains can’t do well. By creating a new zone, you can plug any blockchain system into the Cosmos hub and pass tokens back and forth between those zones, without the need for an intermediary. While the Cosmos Hub is a multi-asset distributed ledger, there is a special native token called the atom. Atoms have three use cases: as a spam-prevention mechanism, as staking tokens, and as a voting mechanism in governance. As a spam prevention mechanism, Atoms are used to pay fees. The fee may be proportional to the amount of computation required by the transaction, similar to Ethereum’s concept of “gas”. Fee distribution is done in-protocol and a protocol specification is described here. As staking tokens, Atoms can be “bonded” in order to earn block rewards. The economic security of the Cosmos Hub is a function of the amount of Atoms staked. The more Atoms that are collateralized, the more “skin” there is at stake and the higher the cost of attacking the network. Thus, the more Atoms there are bonded, the greater the economic security of the network. Atom holders may govern the Cosmos Hub by voting on proposals with their staked Atoms.