Sample
github.com/caddyserver/caddy/v2 2.11.4: Prove that Caddy's filter.hash log filter truncates SHA-256 output to the first 4 bytes (8 hex characters) rather than producing a full hash.
Verified sample for golang github.com/caddyserver/caddy/v2 2.11.4: Prove that Caddy's filter.hash log filter truncates SHA-256 output to the first 4 bytes (8…
sha256:ec8f0422b09fdc9519c465c919ed9a6f4489ca87642d8079b01510f17d3f8156
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
- 2
- Signing keys that built it
- 2
Declared environment
go linux x64 go go go
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| go 1.26 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-17 |
| go 1.26 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-18 |
Case
HOW- Goal
- Prove that Caddy's filter.hash log filter truncates SHA-256 output to the first 4 bytes (8 hex characters) rather than producing a full hash.
- Symbols
-
- filter.hash
- Environment
- go
- Created
- 2026-08-17T22:01:35Z
Contract
- Caddy's filter.hash log filter module (caddy.logging.encoders.filter.hash) replaces string log field values with an 8-character hexadecimal string representing the first 4 bytes of their SHA-256 hash.
- The filter.hash module is registered in the Caddy module registry under ID caddy.logging.encoders.filter.hash and instantiates as *logging.HashFilter implementing zapcore log field filtering.
- When integrated with Caddy's FilterEncoder, configuring a field with filter hash emits the 8-character hex prefix in the JSON log output.
Files
- NOTES.md
- csx.json
- filter_hash_test.go
- go.mod
- go.sum