PLC is a persistent global identifier system, which allows accounts to retain relationships while changing names or migrating between service providers. It makes use of cryptography and gives individuals (or organizations) direct control and ownership over their identitifier, but does not make use of any blockchain or cryptocurrency technology, and is inexpensive enough to provide as a no-cost service.

API Documentation for Slingshot, a firehose-listening atproto edge record and identity cache.

Parakeet is a Rust-based Bluesky AppView aiming to implement most of the functionality required to support the Bluesky client