Value Technology Foundation
VTF's mission is "to be a 'think and do' tank focused on distributed ledger technology (DLT) in the US and other open, free societies."
ACT-IAC Blockchain Working Group
ACT-IAC is an organization of Federal and private-sector technology professionals.
Digital.Gov Blockchain Community
This community serves as a collaborative hub for federal agencies that are interested in exploring distributed ledger technology and its implementation within government. There is a listserve.
Chamber of Digital Commerce
The Chamber of Digital Commerce is a large trade association with many large corporate members. They hold frequent events and are primarily focused on policies regarding cryptocurrency and other digital assets.
DHS S&T Blockchain Portfolio
Introduces DHS use cases for blockchain, provides reference articles, lists SVIP stage 1 startups
DHS Silicon Valley Innovation Program
Explains the Silicon Valley Innovation Program (including funding mechanisms and phases, eligibility requirements, application process, current funding opportunities, benefits, etc.)
Government Blockchain Association
Government Blockchain Association (GBA) is an international nonprofit association helping government, public sector professionals, and organizations around the world to understand, implement, and benefit from blockchain technology related technologies and capabilities.
Federal News Network: What's Going On With Blockchain?
A 2017 4-part look at "how blockchain can change the way agencies meet their mission."