BAC-L2-SUB-105Substrate / Polkadot SDK
First chain: specification and local network
From template to running network: chain specification, genesis state, authority keys, multi-node network on a single machine.
- Level
- L2 — Appchain developer
- Duration
- 4 h
- Maintainer
- Polkadot / Substrate Lead Architect
Learning objectives
- 01Author a complete chain specification, genesis state included
- 02Bring up a local multi-node network that finalises blocks
- 03Reset a network and explain exactly what is destroyed
Guided lab
Generate a specification, distribute authority keys, run three nodes that produce and finalise.
Independent lab
Prepare a genesis state carrying accounts and business parameters, then verify it after bring-up.
Security angle
The development keys present in every template spec: why a public chain launched as-is is already compromised.
Assessment
Local network reproduced by a peer from the repository alone, with no verbal help.