What does HackerNews think of fabric?
Hyperledger Fabric is an enterprise-grade permissioned distributed ledger framework for developing solutions and applications. Its modular and versatile design satisfies a broad range of industry use cases. It offers a unique approach to consensus that enables performance at scale while preserving privacy.
Language:
Go
Hyperledger is one such project: https://www.hyperledger.org/ (mostly the marketing fluff) and https://github.com/hyperledger/fabric
After some research I found that they are using Hyperledger Fabric, a project hosted by the Linux Foundation.
Apparently this uses the open-source Hyperledger Fabric. I wasn't familiar with Hyperledger, but it's hosted by the Linux Foundation.
The first paragraph mentions it's using Hyperledger's Fabric[1] blockchain implementation. I assume they're building their own smart contracts on top of that.