BAC-L1-DOT-102Polkadot
The Polkadot developer toolkit
Polkadot.js, metadata, types and explorer interfaces: the instruments you observe a chain with before changing it.
- Level
- L1 — Blockchain developer
- Duration
- 3 h
- Track
- Polkadot
- Maintainer
- Polkadot / Substrate Lead Architect
Learning objectives
- 01Read a runtime's metadata to discover its available calls
- 02Submit an extrinsic from an interface and from code
- 03Decode an event emitted by the chain
Guided lab
Submit a transfer and a governance call, then locate both in the event stream.
Independent lab
Write a script that enumerates every call in a runtime and groups them by pallet.
Security angle
Verifying what you sign: reading an encoded call before approving it.
Assessment
Inventory script run against a specified runtime.