De[code] Sub[strate]

_{^{† This software is experimental, and not intended for production use yet. Use at your own risk.}}

Encompassing decoder for substrate/polkadot/kusama types.

Gets type definitions from polkadot-js via JSON and decodes them into components that outline types and make decoding byte-strings possible, as long as the module/generic type name are known.

Supports Metadata versions from v8, which means all of Kusama (from CC1). Older networks are not supported (E.G Alexander).

• makes decoding generic types from the substrate rpc possible
• requires parsing JSON with type definitions, and implementing traits TypeDetective and Decoder in order to work for arbitrary chains. However, if the JSON follows the same format as PolkadotJS definitions (look at definitions.json and overrides.json) it would be possible to simply deserialize into Polkadot structs and utilize those. The decoding itself is generic enough to allow it.
• types must adhere to the conventions set out by polkadot decoding
  • type definitions for Polkadot (Kusama) are taken from Polkadot.js and deserialized into Rust (extras/polkadot)

Chain	Extrinsics	Storage	Map	Double Map	Blake_2* hashes	Twox_* Hashes	Identity Hash
Kusama	✅	✅	✅	✅	✅	✅
Polkadot	✅	✅	✅	✅	✅	✅
Westend	✅	✅	✅	✅	✅	✅
Kulupu

Currently Supported Metadata Versions (From Kusama CC1):

• V8
• V9
• V10
• V11