Pith Number

pith:XMELK6BK

pith:2004:XMELK6BKNL7ZVX7IUGECKCEYVY

not attested not anchored not stored refs pending

One million year old groundwater in the Sahara revealed by krypton-81 and chlorine-36

A.M.A. Abdallah, B.E. Lehmann, B. El Kaliouby, K. Bailey, L.J. Patterson, L. Young, M. Sultan, N.C. Sturchio, P. Mueller, R. Becker, R. Lorenzo, R. Purtschert, T. Bigler, T.P. O'Connor, X. Du, Y. Dawood, Z. El Alfy, Z.-T. Lu

arxiv:physics/0402092 v1 · 2004-02-18 · physics.geo-ph · physics.atom-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{XMELK6BKNL7ZVX7IUGECKCEYVY}

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	2026-05-18T01:38:08.544047Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bb08b5782a6aff9adfe8a188250898ae27030b29229b2b6a796ea128163a184a

Aliases

arxiv: physics/0402092 · arxiv_version: physics/0402092v1 · doi: 10.48550/arxiv.physics/0402092 · pith_short_12: XMELK6BKNL7Z · pith_short_16: XMELK6BKNL7ZVX7I · pith_short_8: XMELK6BK

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/XMELK6BKNL7ZVX7IUGECKCEYVY \
  | 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: bb08b5782a6aff9adfe8a188250898ae27030b29229b2b6a796ea128163a184a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a1c55211520e0f1bd3add066c0f670430661fcee1a824b6fd3bd82dd1120be5d",
    "cross_cats_sorted": [
      "physics.atom-ph"
    ],
    "license": "",
    "primary_cat": "physics.geo-ph",
    "submitted_at": "2004-02-18T17:31:17Z",
    "title_canon_sha256": "f4ed03b3f97b5ff7c4e68db4b259791d169ce2ecf0021045f321c7329b2a578c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "physics/0402092",
    "kind": "arxiv",
    "version": 1
  }
}