DMD diamond blockchain has been one of the longstanding community-run ecosystems, since 2013. Its latest upgrade - DMDv4 comes with the first industry features by implementing a cooperative HBBFT consensus with a delegated PoS election validation mechanism. 

This enables the ecosystem to present exciting use-cases such as true decentralisation, censorship resistance, robust security, interoperability, front-running prevention, seamless smart-contract deployment & support, sustainable endless coin reward mechanism, low transaction fees, high throughput, on-chain governance, low carbon footprint, decentralised autonomous organisation (DAO), among others. 

It's a layer-1 blockchain, with a finite maximum supply of 4.38 million coins in circulation. DMD diamond coin is three times scarcer than Bitcoin and the list of trading platforms for buying or selling the coin is available on the official website and coinmarketcap.

Diamond

Validity

BitKan

WaykiChain

QuadrantProtocol

Ycash

Peercoin, also known as PPC or Peer-to-Peer Coin, was created by Sunny King and his team and launched in August 2012. It is the first blockchain to implement Proof-of-Stake consensus.

The primary inspiration behind the creation of Peercoin was to address a number of perceived shortcomings of Bitcoin, including energy efficiency, security and sustainability, decentralization and long-term viability.

Essentially it was designed as an enhanced replacement for Bitcoin. As such, it was originally forked from Bitcoin and uses the same UTXO style blockchain. However, Peercoin's code was modified to introduce Proof-of-Stake as its primary consensus protocol. The next section explains how this makes for a better blockchain.

Given that Peercoin uses most of the same code, it can easily port new features from Bitcoin and utilize any of the supporting infrastructure, including tech advancements like Taproot or Lightning Network. Peercoin is the only Proof-of-Stake blockchain that uses modern Bitcoin code, making it the perfect drop-in replacement.

Peercoin also has a dedicated community, is actively developed, fairly distributed, has low barriers of participation, can do everything that Bitcoin does, minus the 13 TWh of energy usage, and it's not a scam.

Peercoin

Ignis

X-CASH

Graviocoin

SmartCash

HyperCash

Beacon

Francs

Litecoin Cash

0xBitcoin

Tachyon Protocol

MiL.k

Vertcoin

xDai is a cryptocurrency that is pegged to the US dollar. The xDai chain is a stable payment blockchain that is designed for fast and inexpensive transactions. STAKE is secured by proof-of-stake consensus. xDai was founded on Oct. 1, 2018.

STAKE is a multi-chain staking token that is designed to secure the payment layer. Staking allows validators and delegators to provide transaction consensus and receive staking incentives for block production. It is only required for consensus providers, not everyday on-chain transactions.

xDai was created by the POA Network, an open-source public side-chain of Ethereum founded in April 2017. It offers a framework for smart contracts which provides developers with an easy and effective way to code on Ethereum, while also leveraging the POA Network capabilities.