Pith Number

pith:DUL2IPKK

pith:2021:DUL2IPKKSOMXTF4PNDRJCFZWS6

not attested not anchored not stored refs pending

A Mathematical Walkthrough and Discussion of the Free Energy Principle

Anil Seth, Beren Millidge, Christopher L Buckley

arxiv:2108.13343 v2 · 2021-08-30 · cs.AI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DUL2IPKKSOMXTF4PNDRJCFZWS6}

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	2026-07-05T03:19:45.551474Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1d17a43d4a939979978f68e291173697a24ea39512424f94716a05784bfda45e

Aliases

arxiv: 2108.13343 · arxiv_version: 2108.13343v2 · doi: 10.48550/arxiv.2108.13343 · pith_short_12: DUL2IPKKSOMX · pith_short_16: DUL2IPKKSOMXTF4P · pith_short_8: DUL2IPKK

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/DUL2IPKKSOMXTF4PNDRJCFZWS6 \
  | 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: 1d17a43d4a939979978f68e291173697a24ea39512424f94716a05784bfda45e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "216f51a951d3f2afb7636aafeefb6199994f05a9e46269ece31dfc9f48647840",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.AI",
    "submitted_at": "2021-08-30T16:11:49Z",
    "title_canon_sha256": "4a899f63c2dd6d323aabc3e76ee7640c6119d9c95e2e90aaab239d2244177da7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2108.13343",
    "kind": "arxiv",
    "version": 2
  }
}