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QuarkChain: A High-Capacity Peer-to-Peer Transactional System

Welcome to QuarkChain wiki!

QuarkChain is a sharded blockchain protocol that employs a two-layer architecture - one extensible sharding layer consisting of multiple shard chains processing transactions and one root chain layer securing the network and coordinating cross-shard transactions among shard chains. The capacity of the network scales linearly as the number of shard chains increase while the root chain is always providing strong security guarantee regardless of the number of shards. QuarkChain testnet consistently hit 10,000+ TPS with 256 shards run by 50 clusters consisting of 6450 servers with each loadtest submitting 3,000,000 transactions to the network.

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QuarkChain Explained

• QuarkChain Explained, Part 1: Brief Introduction of Blockchain Scalability and QuarkChain
• QuarkChain Explained, Part 2: Sharding — Brief Introduction and Challenges in Blockchain
• QuarkChain Explained, Part 3: Sharding in QuarkChain — State Partitioning
• QuarkChain Explained, Part 4: Sharding in QuarkChain: Consensus
• QuarkChain Explained, Part 5: Collaborative Mining and Hashpower Reuse Technique
• QuarkChain Explained, Part 6: Cross-Shard Transaction
• Order-Statistics-Based Hash Algorithm
• Supporting Multi-Native-Tokens in a Single Blockchain
• Proof of Staked Work — A Simple PoW/PoS Hybrid Consensus
• Slash in Proof of Staked Work with Example to ETC 51% Attack
• Fixed-Supply Token Model With Dynamically-Added Shards/Chains
• Cluster Inconsistent State Classification

Design

• Address, Shard Key, Chain Id, Shard Id
• Transaction Format
• Smart Contract
• Id vs. Hash
• Cluster Design
• Cross Shard Transaction
• Multi Native Token in QuarkChain

QuarkChain Mining

• Introduction of Mining Algorithms
• Development Setup
• Private Network Setting, Port Forwarding
• Start Clusters on the QuarkChain
• Demo Implementation of CPU Mining

Loadtest

• Development Setup
• Run Clusters
• Instructions for Loadtest
• A Quick Way to Run TPS

Further Reading

1. Bitcoin Whitepaper: http://bitcoin.org/bitcoin.pdf
2. Ethereum Wiki: https://github.com/ethereum/wiki/wiki/White-Paper
3. Smart Contracts: https://en.bitcoin.it/wiki/Contracts
4. World with Blockchain at 2068 https://medium.com/quarkchain-official/world-with-blockchain-at-2068-797c4295858a
5. Bitcoin and Cryptocurrency Technologies http://bitcoinbook.cs.princeton.edu/