CodeSampleX

Sample

verify Buffer.concat in pkg:npm/bare-buffer@3.7.0

sha256:b55d3007f26b6a359f94cc8b441596a0645b24edf3bcf2290b26adab8bf42ceb

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Case

HOW
Goal
verify Buffer.concat in pkg:npm/bare-buffer@3.7.0
Packages
Symbols
  • Buffer.concat
Environment
node 22.23.2
Created
2026-08-27T05:17:04Z

Contract

  1. Buffer.concat combines multiple buffers into a single contiguous buffer
  2. Buffer.concat returns an empty buffer when passed an empty list
  3. Buffer.concat calculates total length automatically when length argument is omitted
  4. Buffer.concat truncates output to specified length when length is less than total buffer bytes
  5. Buffer.concat zero-fills unreached trailing bytes when specified length exceeds total input length
  6. Buffer.concat handles mixed buffer types including Uint8Array and Buffer instances
  7. Buffer.concat returns a single buffer copy when list contains only one element

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous