Base event: GW150914 · 2015-09-14T09:50:45Z

All signatures on redacted.space use GW150914 as the signing base. This is a site convention, not a property of the notation. The notation is agnostic about which event serves as anchor — any catalogued GW event with a known absolute timestamp is a valid signing base. The bracketed fingerprint always identifies which event is referenced, so signatures from different sources using different base events remain unambiguous. A valid signing base requires at minimum ℳ_det and z — without chirp mass, the event lacks a physical identity; without redshift, the sender position cannot be reconstructed. Events below this threshold are catalog entries, not signable fingerprints.

Disambiguation: GW event catalog IDs encode a UTC date (e.g. GW150914 = 2015-09-14). Multiple events may share the same date — as detector sensitivity improves, same-day detections become routine. The bracketed physical parameters [ℳ_det | q | χ_eff | a_f | Λ̃ ‖ z | D_L] uniquely identify the source event regardless of catalog date collisions. The full fingerprint is the primary form; the catalog ID is a human convenience label, not the disambiguator.

Bare signature shorthand: once GW150914 is established as the signing base in a given context, subsequent signatures may use a shortened fingerprint:

HT☉^7.68279881[GW150914]

The full bracketed form should precede any shorthand usage, especially when referencing events that share a catalog date with other detections. The shorthand is valid only in contexts where the base event has already been unambiguously identified.