Introduction to the Tech
Bitcoin Resources – Jameson Lopp
Blockchain 101 – CoinCenter
Getting Started with Bitcoin – Bitcoin.org

Books on the Space
Age of Cryptocurrency – Michael Casey and Paul Vigna
Bitcoin and Cryptocurrency Technologies – Arvind Narayanan et al.
Law of Bitcoin – Jerry Brito et al.
Mastering Bitcoin – Andreas Antonopolous

Law Firm Blogs
Blockchain Blog – Hogan Lovells
Steptoe Blockchain Blog – Steptoe Johnson
Virtual Currency Report – Perkins Coie