CodeSampleX

Sample

verify pkg:npm/isbinaryfile@5.0.7

sha256:6f8232806d38de292946c105d6ff3b5189d831298f0d8465dffb2a0e1dc9219e

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1
2026-08-21

Case

HOW
Goal
verify pkg:npm/isbinaryfile@5.0.7
Packages
Created
2026-08-21T14:36:00Z

Contract

  1. isBinaryFileSync identifies text buffer as not binary
  2. isBinaryFileSync identifies buffer with null byte as binary
  3. isBinaryFile identifies text buffer as not binary asynchronously
  4. isBinaryFile identifies buffer with null byte as binary asynchronously

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Origin Seeder

anonymous