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@midnight-ntwrk/wallet-api v3.4.2 • Readme | API

@midnight-ntwrk/wallet-api v3.4.2 / Wallet

Interface: Wallet

Wallet API

Remarks​

Wallet is a data structure that holds the state of the wallet and provides methods for proving, balancing, and submitting transactions.

Methods​

balanceTransaction()​

balanceTransaction(tx, newCoins): Promise<BalanceTransactionToProve | NothingToProve>

Balances the provided transaction.

Parameters​

• tx: Transaction

Transaction to balance

• newCoins: CoinInfo[]

CoinInfo array of coins created by the transaction, which the wallet will watch for and apply to the state

The newCoins parameter should be used in cases where a new coin is created (for example, a DApp mints a coin and wants to send it to the wallet). Because of how Midnight works, newly created coins must be explicitly sent to the wallet using this method. This allows the wallet to monitor them and incorporate them into its state.

Returns​

Promise<BalanceTransactionToProve | NothingToProve>

BalanceTransactionToProve or NothingToProve recipe (for the already balanced transaction) or error.

Remarks​

Balancing a transaction means that for any given output and transaction fees, the wallet will take the available coins from the state to cover them.

proveTransaction()​

proveTransaction(recipe): Promise<Transaction>

Calls the proving server with the proving recipe and returns the proven transaction or error.

Parameters​

• recipe: ProvingRecipe

ProvingRecipe with data to prove

Returns​

Promise<Transaction>

Transaction or error

Remarks​

  • Proof generation takes time and resources, therefore depending on the user's computer specs, this can be an expensive operation
  • There can be wallet implementations that do not need to support proving, in which case this method should return an error

serializeState()​

serializeState(): Promise<string>

Serializes and returns the current state of the wallet which contains:

  • The zswap local state
  • The transaction history
  • The offset in the blockchain corresponding to this state
  • The protocol version
  • The network ID

Returns​

Promise<string>

Serialized WalletState in stringified JSON format

state()​

state(): Observable<WalletState>

Observable (rx.js) stream of WalletState

Returns​

Observable<WalletState>

Remarks​

Should update every time there's a state update

submitTransaction()​

submitTransaction(tx): Promise<string>

Submits the provided transaction to the node

Parameters​

• tx: Transaction

Transaction to submit

Returns​

Promise<string>

TransactionIdentifier - First transaction identifier from identifiers list or error

transferTransaction()​

transferTransaction(outputs): Promise<TransactionToProve>

Prepares a transfer transaction

Parameters​

• outputs: TokenTransfer[]

An array of TokenTransfer a user wants to perform.

Returns​

Promise<TransactionToProve>

Recipe with TransactionToProve or error