CodeSampleX

Sample

github.com/google/uuid v1.6.0: NullUUID

Verified sample for golang github.com/google/uuid v1.6.0: NullUUID. The contract ran on go 1.26 · linux alpine/x64 · docker and passed: NullUUID with…

sha256:1e8deb7703dde7ec0354ec1fc6a1958a45401da1387622f7cb331b6183e1cf10

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 windows 11 x64 go

Verification-run environments

Environment Contract Stages Run
go 1.26 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · golang@1		 2026-08-19

Case

HOW
Goal
verify github.com/google/uuid.NullUUID in pkg:golang/github.com/google/uuid@v1.6.0
Packages
Symbols
  • github.com/google/uuid.NullUUID
Created
2026-08-18T20:49:11Z

Contract

  1. NullUUID with Valid=false returns nil driver.Value and serializes to JSON null
  2. NullUUID with Valid=true returns string driver.Value and serializes to JSON string
  3. NullUUID.Scan successfully scans string, byte slice, and string UUID representations
  4. NullUUID.Scan sets Valid=false on nil input and returns uuid.Nil
  5. NullUUID.Scan returns error on invalid UUID string or incompatible type
  6. NullUUID.UnmarshalJSON unmarshals JSON null as Valid=false and valid UUID string as Valid=true
  7. NullUUID.UnmarshalBinary and MarshalBinary serialize and deserialize 16-byte UUID binary representations

Files

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

Download the source artifact (tar.gz)

Origin Seeder

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