Pith Number

pith:MPGQS4BH

pith:2015:MPGQS4BHN2NI5BYUMHPXH2KBB4

not attested not anchored not stored refs pending

Sound-Proof: Usable Two-Factor Authentication Based on Ambient Sound

Claudio Marforio, Claudio Soriente, Nikolaos Karapanos, Srdjan Capkun

arxiv:1503.03790 v3 · 2015-03-12 · cs.CR · cs.HC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{MPGQS4BHN2NI5BYUMHPXH2KBB4}

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	2026-05-18T01:36:01.415084Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

63cd0970276e9a8e871461df73e9410f232ffa14d57501626cc149b7c18bc124

Aliases

arxiv: 1503.03790 · arxiv_version: 1503.03790v3 · doi: 10.48550/arxiv.1503.03790 · pith_short_12: MPGQS4BHN2NI · pith_short_16: MPGQS4BHN2NI5BYU · pith_short_8: MPGQS4BH

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/MPGQS4BHN2NI5BYUMHPXH2KBB4 \
  | 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: 63cd0970276e9a8e871461df73e9410f232ffa14d57501626cc149b7c18bc124

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a4772685a58dd76847ec337ecbd4ff67fc820132de689c56f7d87e4d48bfb95b",
    "cross_cats_sorted": [
      "cs.HC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2015-03-12T16:06:59Z",
    "title_canon_sha256": "a9d1fea7e4fb0231605d007151a15606a7fc3909a7452378b77562ba38f968b6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1503.03790",
    "kind": "arxiv",
    "version": 3
  }
}