Chainspace: A Sharded Smart Contracts Platform
Mustafa Al-Bassam, Alberto Sonnino, Shehar Bano, Dave Hrycyszyn, George Danezis · 2018
Chainspace is a decentralized infrastructure, known as a distributed ledger, that supports user defined smart contracts and executes user-supplied transactions on their objects.The correct execution of smart contract transactions is verifiable by all.The system is scalable, by sharding state and the execution of transactions, and using S-BAC, a distributed commit protocol, to guarantee consistency.Chainspace is secure against subsets of nodes trying to compromise its integrity or availability properties through Byzantine Fault Tolerance (BFT), and extremely highauditability, non-repudiation and 'blockchain' techniques.Even when BFT fails, auditing mechanisms are in place to trace malicious participants.We present the design, rationale, and details of Chainspace; we argue through evaluating an implementation of the system about its scaling and other features; we illustrate a number of privacy-friendly smart contracts for smart metering, polling and banking and measure their performance. II. SYSTEM OVERVIEWChainspace allows applications developers to implement distributed ledger applications by defining and calling proce-Network and