Pith Number

pith:5RUGIVFI

pith:2026:5RUGIVFIY2YJQQIBCBVOFSWPSV

not attested not anchored not stored refs pending

Optical and Radar Observations of the February 2025 Falcon 9 Upper-Stage Re-entry

Bj\"orn Gustavsson, Dabrowka Knach, Daniel Kastinen, Devin Huyghebaert, Gerd Baumgarten, Jorge L. Chau, Juha Vierinen, Kenneth S. Obenberger, Matthias Clahsen, Nico Pfeffer, Robin Wing, Toralf Renkwitz

arxiv:2605.29124 v1 · 2026-05-27 · physics.space-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5RUGIVFIY2YJQQIBCBVOFSWPSV}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-29T01:05:19.546931Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ec686454a8c6b0984101106ae2cacf9558da6cad28e559bee63a73c067dd072c

Aliases

arxiv: 2605.29124 · arxiv_version: 2605.29124v1 · doi: 10.48550/arxiv.2605.29124 · pith_short_12: 5RUGIVFIY2YJ · pith_short_16: 5RUGIVFIY2YJQQIB · pith_short_8: 5RUGIVFI

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/5RUGIVFIY2YJQQIBCBVOFSWPSV \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: ec686454a8c6b0984101106ae2cacf9558da6cad28e559bee63a73c067dd072c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c131a91904c5e2bda94ae03f595de2dbe49e16d6fd7951368d3e847d1a01182c",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.space-ph",
    "submitted_at": "2026-05-27T21:35:27Z",
    "title_canon_sha256": "50ab9ab4b271a67f2ec660d48e2ca524164bf4a15e8b20a2f3afecfbaa780163"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.29124",
    "kind": "arxiv",
    "version": 1
  }
}