Pith Number

pith:RTMAAFK4

pith:2009:RTMAAFK4KBNCIOJTSKEEY6IAHN

not attested not anchored not stored refs pending

The Nature of Time

Julian Barbour

arxiv:0903.3489 v1 · 2009-03-20 · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RTMAAFK4KBNCIOJTSKEEY6IAHN}

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.

Cited by

1 paper in Pith

Measuring time in a timeless universe

Receipt and verification

First computed	2026-07-04T15:39:54.203215Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8cd800155c505a24393392884c79003b62f2ee85fa9751d2027d91ef72e311b1

Aliases

arxiv: 0903.3489 · arxiv_version: 0903.3489v1 · doi: 10.48550/arxiv.0903.3489 · pith_short_12: RTMAAFK4KBNC · pith_short_16: RTMAAFK4KBNCIOJT · pith_short_8: RTMAAFK4

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/RTMAAFK4KBNCIOJTSKEEY6IAHN \
  | 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: 8cd800155c505a24393392884c79003b62f2ee85fa9751d2027d91ef72e311b1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b02822bad8fd98202d51a4bab2aea1e0987cf65c0a37944a002c07d1f2dedcb9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2009-03-20T10:31:50Z",
    "title_canon_sha256": "0b3e65a7378868500702ee1755238f5723766d00efa7c27bdc7ffe59c807c0eb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.3489",
    "kind": "arxiv",
    "version": 1
  }
}