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+
+## Identifiers
+
+Fatcat entity identifiers are 128-bit UUIDs encoded in base32 format. Revision
+ids are also UUIDs, and encoded in normal UUID fashion, to disambiguate from
+edity identifiers.
+
+Python helpers for conversion:
+
+ import base64
+ import uuid
+
+ def fcid2uuid(s):
+ s = s.split('_')[-1].upper().encode('utf-8')
+ assert len(s) == 26
+ raw = base64.b32decode(s + b"======")
+ return str(uuid.UUID(bytes=raw)).lower()
+
+ def uuid2fcid(s):
+ raw = uuid.UUID(s).bytes
+ return base64.b32encode(raw)[:26].lower().decode('utf-8')
+
+ test_uuid = '00000000-0000-0000-3333-000000000001'
+ assert test_uuid == fcid2uuid(uuid2fcid(test_uuid))
+