CodeSampleX

Sample

verify pkg:golang/github.com/cespare/xxhash/v2@v2.1.2

sha256:eeb605ba7281687aae3b447556012c7d48d0dee6c3aaf2c97fc17e4daa68346e

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 go

Verification-run environments

Environment Contract Stages Run
go 1.26 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · golang@1golang:1.26-alpine@sha256:28d89ee9cc0f…		 2026-08-28

Case

HOW
Goal
verify pkg:golang/github.com/cespare/xxhash/v2@v2.1.2
Packages
Symbols
  • Digest
  • New
  • Sum64
  • Sum64String
Created
2026-08-28T00:41:59Z

Contract

  1. Sum64 calculates 64-bit xxHash checksum for byte slices deterministically
  2. Sum64String calculates 64-bit xxHash checksum for string matching Sum64 on equivalent byte slice
  3. New creates Digest implementing hash.Hash64 that computes matching checksum via Write and Sum64
  4. Digest WriteString computes checksum without extra byte allocation matching Write
  5. Digest Reset clears internal state allowing reuse for independent checksum calculations
  6. Digest Sum appends 8-byte big-endian representation of Sum64 to provided byte slice
  7. Digest MarshalBinary and UnmarshalBinary preserve and restore internal accumulator state across writes

Files

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • main.go
  • spec.json
  • test/contract.go

Download the source artifact (tar.gz)

Origin Seeder

anonymous