Curecoin

Curecoin describes itself as a cryptographic utility token dedicated to replacing ASIC mining with protein folding computations - helping scientists find new medicines in lieu of mining hashes. Curecoin's goal is to accelerate research in the medical sciences relating to Cancer, Alzheimer's, Antibiotics, Diabetes, Huntington's, Ebola, Zika, HIV, Parkinson's, repurposing drug compounds, and Astrobiology. 

With the Dec 2018 release of version 2.0, Curecoin claims to have become 90% more efficient compared to ASIC mining. Registered protein folding participants continue to receive distributions from the 'automated oracle' at Cryptobullionpools.com, with the premine balance cached in cold storage (visible on block explorers). The network has transitioned to pure Proof-of-Stake (averaging ~10% rewards annually), which works to secure Curecoin's network. 

The Curecoin system leverages Stanford's* Folding@home distributed research software. As of 1 May 2019, Curecoin's folding team is ranked #1 on the global Folding@home network. Development is focused on faster transactions, increased security, collaboration with science blockchain consortium partners (like FoldingCoin), as well as supporting philanthropic projects through the Curecoin Project's 501c3 sponsor (Vision's Made Viable).

A Template for Citizen Science Based Universal Basic Income

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KingXChain

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.