Pith Number

pith:IHPT5D5D

pith:2015:IHPT5D5DS2UPOCFYAROE3AU4YI

not attested not anchored not stored refs pending

The Unknown Input Observer and its Advantages with Examples

Sam Nazari

arxiv:1504.07300 v2 · 2015-04-27 · cs.SY

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IHPT5D5DS2UPOCFYAROE3AU4YI}

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	2026-05-18T02:17:32.807825Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

41df3e8fa396a8f708b8045c4d829cc23db1b60a6f865e071ecca6de43cbdda5

Aliases

arxiv: 1504.07300 · arxiv_version: 1504.07300v2 · doi: 10.48550/arxiv.1504.07300 · pith_short_12: IHPT5D5DS2UP · pith_short_16: IHPT5D5DS2UPOCFY · pith_short_8: IHPT5D5D

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/IHPT5D5DS2UPOCFYAROE3AU4YI \
  | 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: 41df3e8fa396a8f708b8045c4d829cc23db1b60a6f865e071ecca6de43cbdda5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8157d19861c381525501609ee771a968223fa1cc308df5e9df2b2abc81966aa8",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/publicdomain/",
    "primary_cat": "cs.SY",
    "submitted_at": "2015-04-27T23:11:09Z",
    "title_canon_sha256": "ea4a3cd3604d1410710ac0b4e731fa10141152cb507fd1f3fe82e4b87b1cdcba"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.07300",
    "kind": "arxiv",
    "version": 2
  }
}