Emercoin (EMC) is the mineable coin based on the Emercoin’s own blockchain. You can convert these coins to other cryptos and back on a few exchanges. Emercoin was launched as early as in 2013 as the Peercoin’s fork.
Wanchain is a blockchain-based distributed superfinance marketplace. This is the definition that the developers whitepaper suggests. It is noteworthy that this loud name hides a really interesting filling. The Wanchain platform allows you to exchange digital assets between other blockchains. It uses the latest cryptographic theories to build a non-proprietary cross-chain and distributed ledger protocol that records both cross-chain and internal transactions.
Scry.info (DDD) is an Ethereum-based token of the Scry.info global data aggregator. DDD token is listed on a few exchanges paired against bitcoin and Ethereum. In this abbreviation, “DDD” stands for "distributed data depositary".