CodeSampleX

Sample

binary serialization with github.com/google/uuid MarshalBinary and UnmarshalBinary

sha256:8525be64586c339bd0d5b7d875cc90b3509b1e13e99976deb399027730db87ce

Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures. Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments. MIT-0

Execution evidence

Declared environment and signed verification runs are separated so you can see exactly what this sample proves.

Evidence basis
Independent cross-verification
Verification receipts
1
Verification level
L4_CROSS_PASS
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
binary serialization with github.com/google/uuid MarshalBinary and UnmarshalBinary
Packages
Symbols
  • github.com/google/uuid.UUID.MarshalBinary
Created
2026-08-19T04:21:00Z

Contract

  1. UUID.MarshalBinary encodes UUID into a 16-byte binary representation without error
  2. UUID.UnmarshalBinary reconstructs exact original UUID from valid 16-byte slice
  3. UUID.UnmarshalBinary returns error for byte slices of invalid length
  4. UUID.MarshalBinary and UnmarshalBinary support uuid.Nil and arbitrary UUIDs in lossless round trip

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous