The Quantum Resistant Ledger (QRL) is a 'fully quantum resistant blockchain network, using PQ-CRYPTO recommended/IETF standardized cryptography'. The QRL utilizes a hash-based eXtended Merkle Tree Signature Scheme (XMSS) instead of ECDSA, which is reportedly vulnerable to quantum attacks and found in many other blockchain projects. The project claims that the security of its platform is complemented by a suite of applications and a development ecosystem which allows users to 'easily build blockchain applications on its provably quantum resistant network'.

Quantum Resistant Ledger

HyperCash

SpaceChain

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

Validity

QuadrantProtocol

Ycash

Grin

WaykiChain

Ignis

Kleros (PNK) is a decentralized dispute resolution project that launched in July 2018. It is an open-source online dispute resolution protocol that uses blockchain and crowdsourcing to adjudicate disputes fairly.

Kleros offers a middleman service for decentralized applications (DApps) and their users. If the service provided by the application does not create a dispute, Kleros acts as a trustless third-party service for payment.

When a dispute does occur, however, each party can apply for arbitration through the Kleros arbitrators that are selected from the owners of PNK tokens. PNK is an Ethereum-based ERC-20 utility token with a fixed supply.

At this point, the jurors can make a decision that will favor either party. The arbitration fees are distributed to all arbitrators in the form of ETH; jurors who have issued a minority decision lose part of their PNK tokens for the benefit of the majority of jurors. This decision can be appealed, at a cost. The stated mission of Kleros is to offer easier access to justice and improve individual freedom.

Kleros charges a cost that is payable in ETH and is provided by the parties to the dispute or drawn from the funds previously locked in escrow.

Kleros

Litecoin Cash

Pillar

Tachyon Protocol

GET Protocol

BitKan

DeepBrain Chain

Nimiq is designed to make cryptocurrencies easy to use for everyone without compromising decentralization. Nimiq is the only blockchain where users always participate directly by default. In comparison to the likes of Bitcoin and Ethereum where the default is to use a third-party node to connect to the network. Learn more: https://youtu.be/dA40oyDVtqs

Team Nimiq invented Nimiq OASIS, the DeFi crypto-fiat bridge! Atomic swaps between crypto like NIM and BTC (ETH coming soon) and fiat currencies like EUR (USD next) with no personal information are now possible. Earned swap fees are converted to NIM and held to create scarcity. See how it works: https://youtu.be/Spp_Be4dHaM

Nimiq created Albatross, a new, super fast Proof-of-Stake consensus algorithm that will launch with Nimiq 2.0, the next version of the Nimiq Blockchain. We expect ~1000 TPS and finality in one second, pushing Nimiq 2.0 to the theoretical limits of single chain blockchain protocols. Energy consumption will also be reduced to less than 1% (compared to current Nimiq POW) with this upgrade. Try out the demo: https://www.nimiq.com/albatross/

Nimiq’s “super-halving” coming soon! The transition to Nimiq 2.0 will reduce the emission rate from currently ~3000 NIM to only ~525 NIM per minute. Calculate your rewards using the Staking Calculator: https://www.nimiq.com/staking-calculator/

Join the friendly Nimiq Community to ask questions and learn more: https://www.nimiq.com/community/