The Secure Public Online Ownership Ledger (SPOOL). This REST-api provides a JSON interface for the SPOOL protocol.
The original spoolio repository (on GitHub) contained some sensitive information in its Git history, so the files were copied, the sensitive information was redacted, and a new Git repository was created: spoolio-copy. If you're an internet historian and want to look at an archive of the original spoolio repository, then contact Trent McConaghy (@trentmc0 on Twitter).
Sphinx-based documentation is located under docs. Instructions on building and viewing these docs are located under docs/source/docs.rst.