Sample
Generate random Version 4 UUIDs from custom io.Reader entropy sources using uuid.NewRandomFromReader
sha256:c158169c41402d31e2090044a9382719e1cec141923966ec10315c937952df6b
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
- Generate random Version 4 UUIDs from custom io.Reader entropy sources using uuid.NewRandomFromReader
- Packages
- Symbols
-
- github.com/google/uuid.NewRandomFromReader
- Created
- 2026-08-19T09:08:29Z
Contract
- assert NewRandomFromReader generates Version 4 UUID with RFC4122 variant from an io.Reader
- assert NewRandomFromReader produces deterministic UUID bytes with version 4 and variant bits masked from fixed byte source
- assert NewRandomFromReader returns error when reader returns EOF before reading 16 bytes
- assert NewRandomFromReader propagates underlying reader errors and returns Nil UUID
- assert NewRandomFromReader output formats as valid 36-character hyphenated UUID string and round-trips via uuid.Parse
Files
- PROMPT.md
- csx.json
- go.mod
- go.sum
- main.go
- spec.json
- test/contract.go
Origin Seeder
anonymous