Pith Number

pith:SMXN7RFZ

pith:2015:SMXN7RFZ7QWYTK7VJ3BHFJJRTQ

not attested not anchored not stored refs pending

Multiphasic pH profiles for the reaction of tris-(hydroxymethyl)-aminomethane with phenyl esters

Per Nissen

arxiv:1512.02561 v1 · 2015-12-08 · physics.chem-ph · q-bio.BM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SMXN7RFZ7QWYTK7VJ3BHFJJRTQ}

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	2026-05-18T01:24:44.434856Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

932edfc4b9fc2d89abf54ec272a5319c354b5fb529825fb5b74dac231058ee9f

Aliases

arxiv: 1512.02561 · arxiv_version: 1512.02561v1 · doi: 10.48550/arxiv.1512.02561 · pith_short_12: SMXN7RFZ7QWY · pith_short_16: SMXN7RFZ7QWYTK7V · pith_short_8: SMXN7RFZ

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/SMXN7RFZ7QWYTK7VJ3BHFJJRTQ \
  | 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: 932edfc4b9fc2d89abf54ec272a5319c354b5fb529825fb5b74dac231058ee9f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a0a671212a4c25b9678a167a374a63981cedf4cfacab787f49982a2c901767fa",
    "cross_cats_sorted": [
      "q-bio.BM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.chem-ph",
    "submitted_at": "2015-12-08T17:36:18Z",
    "title_canon_sha256": "c3af63544648620765418acccd177a40bed1991adc1a651cc5e554dea7651a38"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1512.02561",
    "kind": "arxiv",
    "version": 1
  }
}