Pith Number

pith:TLERDRUW

pith:2021:TLERDRUW7XWHU4UC6AMD56CY34

not attested not anchored not stored refs pending

J1721$+$8842: a gravitationally lensed binary quasar with a proximate damped Lyman-$\alpha$ absorber

A. Agnello, C. Lemon, D. Sluse, E. Paic, F. Courbin, J. Chan, M. Auger, M. Millon

arxiv:2109.01144 v1 · 2021-09-02 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{TLERDRUW7XWHU4UC6AMD56CY34}

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	2026-07-05T03:51:32.513095Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9ac911c696fdec7a7282f0183ef858df0759636399451eb589d189f94d68538c

Aliases

arxiv: 2109.01144 · arxiv_version: 2109.01144v1 · doi: 10.48550/arxiv.2109.01144 · pith_short_12: TLERDRUW7XWH · pith_short_16: TLERDRUW7XWHU4UC · pith_short_8: TLERDRUW

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/TLERDRUW7XWHU4UC6AMD56CY34 \
  | 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: 9ac911c696fdec7a7282f0183ef858df0759636399451eb589d189f94d68538c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ff2af436b87f30884b93b065d04926549fd18c28c9159bd969e802c7f493d4b6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2021-09-02T18:00:02Z",
    "title_canon_sha256": "4af1c2564b3f78518fae3d7b9f7e340f720a458349183dced345455a7544f0e3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2109.01144",
    "kind": "arxiv",
    "version": 1
  }
}