Pith Number

pith:KUL7R2ZE

pith:2020:KUL7R2ZEXCZEUOPIGRMT2PIY2I

not attested not anchored not stored refs pending

Low cost passive pH sensor fabricated on scotch tape

Ayan Majumder, Kasturi Saha, Siddharth Tallur, Subrat Kumar Pradhan

arxiv:2001.04291 v1 · 2020-01-13 · physics.app-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{KUL7R2ZEXCZEUOPIGRMT2PIY2I}

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	2026-07-05T01:40:23.194450Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5517f8eb24b8b24a39e834593d3d18d23ce12988a719e5efe91965381a158992

Aliases

arxiv: 2001.04291 · arxiv_version: 2001.04291v1 · doi: 10.48550/arxiv.2001.04291 · pith_short_12: KUL7R2ZEXCZE · pith_short_16: KUL7R2ZEXCZEUOPI · pith_short_8: KUL7R2ZE

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/KUL7R2ZEXCZEUOPIGRMT2PIY2I \
  | 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: 5517f8eb24b8b24a39e834593d3d18d23ce12988a719e5efe91965381a158992

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fe517eeeb3c2e5a9d5e7f6441dc83eb7bb1017b67b50e10ed64b56b2044ca92b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.app-ph",
    "submitted_at": "2020-01-13T14:36:59Z",
    "title_canon_sha256": "1c8fb6a91dc8af5d5c9d4a3589fcf68dc383e5688b9eed55a0d0b1fdd06417a7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2001.04291",
    "kind": "arxiv",
    "version": 1
  }
}