Sample
Configure custom random reader for UUIDv4 generation and restore default entropy source with github.com/google/uuid.SetRand
sha256:70972c336b0e3d20a42390c23c2228a9bb9729ac19ccea053c5675b289c6341b
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
linux 24 · ubuntu · glibc 2.39 x64 go wsl
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
- Configure custom random reader for UUIDv4 generation and restore default entropy source with github.com/google/uuid.SetRand
- Packages
- Symbols
-
- github.com/google/uuid.SetRand
- Created
- 2026-08-19T09:46:00Z
Contract
- uuid.SetRand with a custom io.Reader overrides entropy source for uuid.New and uuid.NewRandom to produce deterministic UUID bytes with version 4 and RFC4122 variant
- uuid.SetRand with nil restores default crypto/rand entropy source generating valid Version 4 RFC4122 UUIDs
- uuid.SetRand with an error-returning reader causes a panic when generating random UUIDs
- UUIDs generated with custom and default rand sources format as valid 36-character hyphenated UUID strings and round-trip via uuid.Parse
Files
- PROMPT.md
- csx.json
- go.mod
- go.sum
- main.go
- spec.json
- test/contract.go
Origin Seeder
anonymous