Pith Number record

pith:QVJLU2XL

pith:2017:QVJLU2XL6QPRVRKFFVZUINAMO6

Protocol content-addressed Pith receipt schema 1.0

Author: not author-attested
Timestamp: not externally anchored
Storage: storage not verified
References: references not resolved

Disk evolution and the fate of water

Fred Ciesla, Lee Hartmann, Oliver Gressel, Richard Alexander

Source: arxiv:1708.03360 v1 · Submitted 2017-08-10 · License http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Categories: astro-ph.SR

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 (8552ba6aebf41f1ac5452d73...) across three calendars. Confirms instantly. Calendars upgrade to a Bitcoin-block proof in a few hours.

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.

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.

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.

Relationship

Citing URL (e.g. arxiv.org/abs/...)

More options

Target claim ID (e.g. C1)

Citing Pith Number (pith:YYYY:...)

Note (public, max 500 chars)

Your name

Email (not displayed)

ORCID

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.

Result class

Evidence URL (http(s))

More options

Target claim ID (e.g. C1) Methodology (public, max 1500 chars) Summary (public, max 1500 chars)

Your name

Email (not displayed)

ORCID

Held for moderation before it appears as confirmed.

Claims

Receipt

First computed	2026-05-18T00:36:27.830539Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`, fingerprint `8d4b5ee74e4693bc…`) · public key
Signature value	`wgq1maW3QY2tlHWjMEXoeC8DQCoVb3AUh4UzNyQUtBDnNqOb6DH6L1sAqV+G4yB6zurl6VqmP85tezkt0tSOCg==`
Schema	pith-number/v1.0

Canonical hash

8552ba6aebf41f1ac5452d7344340c77ae7e6f384552c5281142d3e8fc01f436

Aliases

Kind	Value
arxiv	`1708.03360`
arxiv_version	`1708.03360v1`
doi	`10.48550/arxiv.1708.03360`

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/QVJLU2XL6QPRVRKFFVZUINAMO6 \
  | 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: 8552ba6aebf41f1ac5452d7344340c77ae7e6f384552c5281142d3e8fc01f436

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('wgq1maW3QY2tlHWjMEXoeC8DQCoVb3AUh4UzNyQUtBDnNqOb6DH6L1sAqV+G4yB6zurl6VqmP85tezkt0tSOCg==')
digest = bytes.fromhex('8552ba6aebf41f1ac5452d7344340c77ae7e6f384552c5281142d3e8fc01f436')
pub.verify(sig, digest)
print('signature OK')"

Show canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e4602cb4ba3b4bb7a6079ed7b4126a098bbf0d4bedd25903f93af321f00530e4",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2017-08-10T19:21:40Z",
    "title_canon_sha256": "5a8bf06cce7249903639182dbec386a6cb4d197ed6af1932ca69eaf804bcd2c4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1708.03360",
    "kind": "arxiv",
    "version": 1
  }
}