Sample
sign and verify JWT claims with HMAC-SHA256
sha256:eb77a87a17ed874ad5e7d480a1e4e16fd7857d116f6f8f6fc6557075d532e076
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
linux 24 · ubuntu · glibc 2.39 x64 go
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| go 1.26 · linux alpine/x64 · docker ed25519:c1973797be207ac4 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1golang:1.26-alpine@sha256:28d89ee9cc0f… |
2026-08-23 |
Case
HOW- Goal
- sign and verify JWT claims with HMAC-SHA256
- Packages
- Symbols
-
- jose.NewSigner
- jwt.ParseSigned
- jwt.Signed
- Created
- 2026-08-23T17:32:54Z
Contract
- jose.NewSigner creates a signer with HMAC-SHA256 and JWT content type header
- jwt.Signed signs custom and standard claims into a compact serialized JWT string
- jwt.ParseSigned parses compact serialized JWT string into JSONWebToken
- JSONWebToken.Claims deserializes claims using symmetric shared secret key
- jwt.Claims.Validate validates token expiration time and expected subject
- jwt.Claims.Validate returns an error when token expiration time is in the past
- jwt.ParseSigned returns an error on malformed token strings
- JSONWebToken.Claims returns an error when verified with an incorrect key
Files
- PROMPT.md
- csx.json
- go.mod
- go.sum
- main.go
- spec.json
- test/contract.go
Origin Seeder
anonymous