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Basic structure of an app using chia

CHIA Your Code
| +--------------------+ +----------+
Node RPC <---|-> | Specialized Wallet |<----->| Database |
^ | +--------------------+ +----------+
| | ^ ^
| | | |
| | | v
v | | +------------------+
Wallet RPC --|-------+ | State management |
| +------------------+
| ^

Concerns for developing chia apps

  • The app likely needs a connection to the chia RPC at least for now.

  • A "wallet" type system is needed to track blockchain traffic so that the app's concept of the current state can be recovered from the same information that's represented in the blockchain and in order to keep the state presented to the end user consistent via the node API and a well designed set of arguments to the chialisp code. Coins touched in a block are available via the full node's get_additions_and_removals and the solutions via get_puzzle_and_solution. By checking out each block, it'll be possible to find specially formatted coin solutions and track them.

  • The app needs at a minimum to allow the user to take actions in a comprehensible way, which means using a combination of the wallet and node's RPC API to

    1. Establish which public and private keys to use when interacting with coins on the blockchain via get_transactions, get_coin_record_by_name and get_private_key and the master_sk_to_wallet_sk function.

    2. Send transactions to the blockchain via push_tx.

  • It's likely that the app won't be able to guarantee that it remains running for the full duration of the purpose of the code it deploys, therefore any state picked up from the blockchain should be stored in and retrieved from a local cache database.

  • If more than one party is cooperating over the coin in question, then either an identifier picking out the coin in question needs to be sent out of band or something identifiable by the recipient needs to be embedded in the coin solution.