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The core package is concerned with standardizing aspects of web3 development across ecosystems. It contains such things as:
  • NetworkConfig
  • Various signals
  • Generalized pubkey factory and PublicKey type
  • Middleware mv subsystem
  • Generalized type interfaces, such as TxBase and Signer<Tx extends TxBase>
  • protobuf support (WIP)
  • Shared business logic with deferrals to middlewares for ecosystem-specific implementations

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Network Configs

Among the most important concepts in the SDK are NetworkConfigs. These are used to configure the SDK for a specific blockchain, including which RPC to use. Most of the SDK is built on NetworkConfigs. Importantly, each NetworkConfig is referenced by instance. If your custom systems require generalization or persistence, it should generally refer to the network’s name or chainId instead. While both are unique identifiers for a chain, the name refers to the current canonical name of the chain, while chainId uniquely identifies a specific hard fork of a chain. For example, “cosmoshub” refers to the latest version of the Cosmos Hub as agreed upon by its active validator set, while “cosmoshub-4” refers to a specific version of the Hub. But generally, you are likely fine just using name for most purposes.

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Signals

Signals are technically an optional feature of the SDK, but a highly useful one. They act as a sort of lightweight dependency injection system, allowing you to inject certain frequently-used values into the application, and making it easier to manage through a GUI (e.g. a Wallet Modal). The signals object contains the following signals:
  • signer (signal) for the currently connected signer,
  • network (signal) for the currently connected network,
  • chainId (computed) for the chain ID of the currently connected network,
  • publicKey (computed) for the public key of the currently connected address,
  • address (computed) for the currently connected address,
  • bech32prefix (computed) for the Bech32 prefix of the currently connected network, if applicable.

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Public Keys

Every blockchain is based on the cryptographic primitive of key pairs, even if abstracted away behind social logins or multi-sig wallets. However, their representation may differ from chain to chain. The pubkey wraps the different types of public keys, but has otherwise no knowledge of how to serialize or encode them; this is provided by other packages like @apophis/cosmos through the middleware system. As a consumer of the SDK, you will likely only need the pubkey factory.