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Pith Number record

pith:DCAMQKI7

pith:2017:DCAMQKI7SAADEOUJZGUOIWWFJP
Protocol content-addressed Pith receipt schema 1.0
Author
not author-attested
Timestamp
not externally anchored
Storage
storage not verified
References
references not resolved

The process of 3D-printed skull models for the anatomy education

Chao Guo, Gang Xiong, Hui Pan, Shi Chen, Xisong Dong, Xiuqin Shang, Yi Xie, Yong Yao, Yuqing Li, Zhen Shen, Zhouxian Pan

Source: arxiv:1711.07106 v1 · Submitted 2017-11-19 · License http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Categories: cs.OH

Open Pith paper page Download JSON What is a Pith Number?

Record completeness checklist

Each row is a typed event attached to this Pith Number. Done rows show their third-party proof. Open rows have an inline form so you can complete them without leaving this page.

1 Anchor canonical hash to Bitcoin via OpenTimestamps open
Stamps the canonical SHA-256 (1880c8291f9000323a89c9a8...) across three calendars. Confirms instantly. Calendars upgrade to a Bitcoin-block proof in a few hours.
Free. No account. Anyone can re-stamp; each stamp is an independent calendar receipt.
2 Mirror to Internet Archive (Wayback Machine) open
Submits the paper URL to the Internet Archive and records the resulting Wayback capture URL plus timestamp. Pith does not host the paper.
Free, anonymous, third-party preservation.
3 Claim authorship open
Identity-backed. The same flow as the paper page. Sign in with ORCID, Apple, X, or email magic-link; if your ORCID is on the arXiv author list the attestation is one-click and shows ORCID verified.
Returns you right back here after sign-in.
4 Sign a citation pointing at this record open
Records a signed citation. Pick a relationship (supports, refutes, extends, uses_method, depends_on, replaces, compares, cites). Pith signs the assertion server-side.
More options
Held for moderation. Sign in to confirm immediately.
5 Submit replication, falsification, or formal bridge open
Public record of a replication attempt, formal bridge (Lean / Coq), or falsification. Held for moderation. Not peer review; a typed annotation.
More options
Held for moderation before it appears as confirmed.

Claims

Receipt

First computed 2026-05-18T00:30:12.259480Z
Builder pith-number-builder-2026-05-17-v1
Signature Pith Ed25519 (pith-v1-2026-05, fingerprint 8d4b5ee74e4693bc…) · public key
Signature value 7Nxl4wVXACuF+hmnLiJguLc+M1SIS2y2axLcxfho6RqopTrDrW17GpBJuRzq8TWAS3k+jkNM0qmoa14Dptf6AA==
Schema pith-number/v1.0

Canonical hash

1880c8291f9000323a89c9a8e45ac54bcdaf3abe94aba43205ef732cf07da8e1

Aliases

Kind Value
arxiv 1711.07106
arxiv_version 1711.07106v1
doi 10.48550/arxiv.1711.07106

Agent API

Same address serves humans and agents. Add an Accept header to get the JSON-LD payload at the resolver URL itself.

Resolver JSON Graph JSON Events JSON Schema Signing key Resolve alias

Verify this Pith Number yourself

Three shell lines recompute the canonical hash. If the hash you compute matches the one shown above, the record is intact end-to-end.

curl -sH 'Accept: application/ld+json' https://pith.science/pith/DCAMQKI7SAADEOUJZGUOIWWFJP \
  | 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: 1880c8291f9000323a89c9a8e45ac54bcdaf3abe94aba43205ef732cf07da8e1

Verify the Pith Ed25519 signature against the published public key:

curl -s https://pith.science/pith-signing-key.json | jq -r .public_key_b64 \
  | base64 -d > /tmp/pith_pub.bin
python3 -c "
from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PublicKey
import base64
pub = Ed25519PublicKey.from_public_bytes(open('/tmp/pith_pub.bin','rb').read())
sig = base64.b64decode('7Nxl4wVXACuF+hmnLiJguLc+M1SIS2y2axLcxfho6RqopTrDrW17GpBJuRzq8TWAS3k+jkNM0qmoa14Dptf6AA==')
digest = bytes.fromhex('1880c8291f9000323a89c9a8e45ac54bcdaf3abe94aba43205ef732cf07da8e1')
pub.verify(sig, digest)
print('signature OK')"
Show canonical record JSON 
{
  "metadata": {
    "abstract_canon_sha256": "9ca47b573837f4c5ee3c00b5a303eec4d7d1fc0b009a6e08b3fe3c6aff6d623b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.OH",
    "submitted_at": "2017-11-19T23:58:25Z",
    "title_canon_sha256": "ecd7ff2d607a0183bef411199bdc1f202f9c00bfd35f817f802e6d8b3205ae28"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1711.07106",
    "kind": "arxiv",
    "version": 1
  }
}