product-sdk

Use when connecting to Polkadot chains, querying chain state, subscribing to storage, working with typed APIs, or choosing between preset and BYOD paths. Covers @parity/product-sdk-chain-client and @parity/product-sdk-descriptors.

Use when uploading or retrieving data via Cloud Storage, working with CID-based decentralized storage, or the CloudStorageClient SDK. Covers the store() upload builder, chunked uploads, container-only reads (fetch/query), CID helpers, and authorization.

End-to-end scaffolding and implementation of Polkadot applications using @parity/product-sdk packages. Use when: creating a new Polkadot project, building a dApp, scaffolding chain interactions, choosing which @parity/product-sdk packages to install, or when a user says "build me a Polkadot app". Handles both developer-guided and fully autonomous (non-developer) workflows.

Submit transactions, connect wallets, manage signers, and handle keys in product-sdk. Use when: submitting transactions, integrating Host API signing (Polkadot Desktop/Mobile), managing multi-provider wallet accounts, deriving keys, creating dev signers for testnet, or wiring QR/mobile sign-in for CLIs. Covers @parity/product-sdk-tx (submit/watch), @parity/product-sdk-signer (wallet connection, account management, multi-provider signing), @parity/product-sdk-keys (key derivation, session keys), and @parity/product-sdk-auth (QR/mobile CLI sign-in + product-account session signers).

Use when migrating a product codebase to @parity/product-sdk — detects legacy stacks (polkadot-apps, novasamatech, hand-rolled crypto/IPFS, polkadot-api 1.x) in the target repo, decides which migration areas apply, writes a per-repo migration spec, then hands off to writing-plans.

Use when interacting with smart contracts (PolkaVM/Solidity) on Asset Hub, using ContractManager with cdm.json manifests, createContract for ad-hoc contracts, ContractRuntime creation, or contract type codegen. Covers @parity/product-sdk-contracts.

Use when publishing or subscribing to ephemeral messages on the Polkadot Statement Store. Covers StatementStoreClient lifecycle, two connection modes (host and local), topic/channel creation, ChannelStore last-write-wins semantics, data size limits, and StatementTransport BYOD.

Use when working with Polkadot address encoding, SS58, H160, EVM address conversion, cryptographic encryption (AES, ChaCha, NaCl, HKDF), byte encoding/decoding, token formatting (planck), key-value storage, or structured logging in @parity/product-sdk packages. Covers address, crypto, utils, storage, and logger utilities.