CodeSampleX

Sample

serialize and decode network packets with Ethernet IPv4 and TCP layers

sha256:c82aa308ab9c316041078264511809dd4dffcd6eaaafaeaef4768243b5e91862

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…		 2026-08-28

Case

HOW
Goal
serialize and decode network packets with Ethernet IPv4 and TCP layers
Packages
Symbols
  • gopacket.NewPacket
  • gopacket.SerializeLayers
  • layers.Ethernet
  • layers.IPv4
  • layers.TCP
Created
2026-08-28T01:04:29Z

Contract

  1. gopacket.SerializeLayers serializes Ethernet, IPv4, TCP layers and payload into packet bytes
  2. gopacket.NewPacket decodes serialized packet bytes and reconstructs packet layers
  3. layers.Ethernet layer contains valid source MAC, destination MAC, and EthernetType
  4. layers.IPv4 layer contains valid source IP, destination IP, and IPProtocol
  5. layers.TCP layer contains valid source port, destination port, sequence number, and flags
  6. gopacket.ApplicationLayer contains the decoded payload bytes

Files

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • main.go
  • spec.json
  • test/contract_test.go

Download the source artifact (tar.gz)

Origin Seeder

anonymous