Sample
Generate and parse UUIDv4 strings with google/uuid
sha256:c1f8bf4eb6e96519d90649f09f1f360f42832af56bb8721495b33ea3df94faeb
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
go 1.26 windows 11 x64 go 1.26 go go 1
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
- Generate and parse UUIDv4 strings with google/uuid
- Packages
- Symbols
-
- NewString
- Parse
- Environment
- go 1.26.5
- Created
- 2026-08-19T03:47:35Z
Contract
- uuid.NewString generates a non-empty 36-character hyphenated UUID string
- uuid.NewString produces distinct unique UUID strings across repeated invocations
- uuid.Parse successfully parses standard 36-character UUID strings generated by NewString
- uuid.Parse successfully decodes UUID version 4 and RFC4122 variant from NewString output
- uuid.Parse parses 32-character hexadecimal UUID strings without hyphens
- uuid.Parse parses curly braced UUID strings
- uuid.Parse parses URN formatted UUID strings
- uuid.Parse returns an error when given invalid or malformed UUID strings
- uuid.NewString and uuid.Parse round-trip accurately preserves byte representation
Files
- PROMPT.md
- csx.json
- go.mod
- go.sum
- main.go
- spec.json
- test/contract.go
Origin Seeder
anonymous