This is an AT Protocol Personal Data Server (an atproto PDS).

Host:     hearth.emerald-cobra.ts.net
DID:      did:web:hearth.emerald-cobra.ts.net
Software: atproto-pds 0.15.0-rc.6+3521380bc1

Most API routes are under /xrpc/
Account portal:  /account
Health:          /xrpc/_health

Protocol: https://atproto.com