Struct Client 

pub struct Client<AUTH> { /* private fields */ }

A light client for connecting to the Miden network.

Miden client is responsible for managing a set of accounts. Specifically, the client:

• Keeps track of the current and historical states of a set of accounts and related objects such as notes and transactions.
• Connects to a Miden node to periodically sync with the current state of the network.
• Executes, proves, and submits transactions to the network as directed by the user.

Implementations

impl<AUTH> Client<AUTH>

This section of the Client contains methods for:

• Account creation: Use the AccountBuilder to construct new accounts, specifying account type, storage mode (public/private), and attaching necessary components (e.g., basic wallet or fungible faucet). After creation, they can be added to the client.

• Account tracking: Accounts added via the client are persisted to the local store, where their state (including nonce, balance, and metadata) is updated upon every synchronization with the network.

• Data retrieval: The module also provides methods to fetch account-related data.

pub async fn add_account( &mut self, account: &Account, overwrite: bool, ) -> Result<(), ClientError>

Adds the provided Account in the store so it can start being tracked by the client.

If the account is already being tracked and overwrite is set to true, the account will be overwritten. Newly created accounts must embed their seed (account.seed() must return Some(_)).

Errors

• If the account is new but it does not contain the seed.
• If the account is already tracked and overwrite is set to false.
• If overwrite is set to true and the account_data nonce is lower than the one already being tracked.
• If overwrite is set to true and the account_data commitment doesn’t match the network’s account commitment.

pub async fn import_account_by_id( &mut self, account_id: AccountId, ) -> Result<(), ClientError>

Imports an account from the network to the client’s store. The account needs to be public and be tracked by the network, it will be fetched by its ID. If the account was already being tracked by the client, it’s state will be overwritten.

Errors

• If the account is not found on the network.
• If the account is private.
• There was an error sending the request to the network.

pub async fn add_address( &mut self, address: Address, account_id: AccountId, ) -> Result<(), ClientError>

Adds an Address to the associated AccountId, alongside its derived NoteTag.

Errors

• If the account is not found on the network.
• If the address is already being tracked.

pub async fn remove_address( &mut self, address: Address, account_id: AccountId, ) -> Result<(), ClientError>

Removes an Address from the associated AccountId, alongside its derived NoteTag.

Errors

• If the account is not found on the network.
• If the address is not being tracked.

pub async fn get_account_headers( &self, ) -> Result<Vec<(AccountHeader, AccountStatus)>, ClientError>

Returns a list of AccountHeader of all accounts stored in the database along with their statuses.

Said accounts’ state is the state after the last performed sync.

pub async fn get_account( &self, account_id: AccountId, ) -> Result<Option<AccountRecord>, ClientError>

Retrieves a full AccountRecord object for the specified account_id. This result represents data for the latest state known to the client, alongside its status. Returns None if the account ID is not found.

pub async fn get_account_header_by_id( &self, account_id: AccountId, ) -> Result<Option<(AccountHeader, AccountStatus)>, ClientError>

Retrieves an AccountHeader object for the specified AccountId along with its status. Returns None if the account ID is not found.

Said account’s state is the state according to the last sync performed.

pub async fn try_get_account( &self, account_id: AccountId, ) -> Result<AccountRecord, ClientError>

Attempts to retrieve an AccountRecord by its AccountId.

Errors

• If the account record is not found.
• If the underlying store operation fails.

pub async fn try_get_account_header( &self, account_id: AccountId, ) -> Result<(AccountHeader, AccountStatus), ClientError>

Attempts to retrieve an AccountHeader by its AccountId.

Errors

• If the account header is not found.
• If the underlying store operation fails.

impl<AUTH> Client<AUTH>

where AUTH: TransactionAuthenticator + Sync + 'static,

Note importing methods.

pub async fn import_note( &mut self, note_file: NoteFile, ) -> Result<NoteId, ClientError>

Imports a new input note into the client’s store. The information stored depends on the type of note file provided. If the note existed previously, it will be updated with the new information. The tag specified by the NoteFile will start being tracked.

• If the note file is a NoteFile::NoteId, the note is fetched from the node and stored in the client’s store. If the note is private or doesn’t exist, an error is returned.
• If the note file is a NoteFile::NoteDetails, a new note is created with the provided details and tag.
• If the note file is a NoteFile::NoteWithProof, the note is stored with the provided inclusion proof and metadata. The block header data is only fetched from the node if the note is committed in the past relative to the client.

Errors

• If an attempt is made to overwrite a note that is currently processing.

impl<AUTH> Client<AUTH>

where AUTH: TransactionAuthenticator + Sync,

Note retrieval methods.

pub async fn get_input_notes( &self, filter: NoteFilter, ) -> Result<Vec<InputNoteRecord>, ClientError>

Retrieves the input notes managed by the client from the store.

Errors

Returns a ClientError::StoreError if the filter is NoteFilter::Unique and there is no Note with the provided ID.

pub async fn get_consumable_notes( &self, account_id: Option<AccountId>, ) -> Result<Vec<(InputNoteRecord, Vec<NoteConsumability>)>, ClientError>

Returns the input notes and their consumability. Assuming the notes will be consumed by a normal consume transaction. If account_id is None then all consumable input notes are returned.

The note screener runs a series of checks to determine whether the note can be executed as part of a transaction for a specific account. If the specific account ID can consume it (ie, if it’s compatible with the account), it will be returned as part of the result list.

pub async fn get_note_consumability( &self, note: InputNoteRecord, ) -> Result<Vec<NoteConsumability>, ClientError>

Returns the consumability conditions for the provided note.

The note screener runs a series of checks to determine whether the note can be executed as part of a transaction for a specific account. If the specific account ID can consume it (ie, if it’s compatible with the account), it will be returned as part of the result list.

pub async fn get_input_note( &self, note_id: NoteId, ) -> Result<Option<InputNoteRecord>, ClientError>

Retrieves the input note given a NoteId. Returns None if the note is not found.

pub async fn get_output_notes( &self, filter: NoteFilter, ) -> Result<Vec<OutputNoteRecord>, ClientError>

Returns output notes managed by this client.

pub async fn get_output_note( &self, note_id: NoteId, ) -> Result<Option<OutputNoteRecord>, ClientError>

Retrieves the output note given a NoteId. Returns None if the note is not found.

impl<AUTH> Client<AUTH>

Client note transport methods.

pub fn is_note_transport_enabled(&self) -> bool

Check if note transport connection is configured

pub async fn send_private_note( &mut self, note: Note, _address: &Address, ) -> Result<(), ClientError>

Send a note through the note transport network.

The note will be end-to-end encrypted (unimplemented, currently plaintext) using the provided recipient’s address details. The recipient will be able to retrieve this note through the note’s NoteTag.

impl<AUTH> Client<AUTH>

where AUTH: TransactionAuthenticator + Sync + 'static,

pub async fn fetch_private_notes(&mut self) -> Result<(), ClientError>

Fetch notes for tracked note tags.

The client will query the configured note transport node for all tracked note tags. To list tracked tags please use Client::get_note_tags. To add a new note tag please use Client::add_note_tag. Only notes directed at your addresses will be stored and readable given the use of end-to-end encryption (unimplemented). Fetched notes will be stored into the client’s store.

An internal pagination mechanism is employed to reduce the number of downloaded notes. To fetch the full history of private notes for the tracked tags, use Client::fetch_all_private_notes.

pub async fn fetch_all_private_notes(&mut self) -> Result<(), ClientError>

Fetches all notes for tracked note tags.

Similar to Client::fetch_private_notes however does not employ pagination, fetching all notes stored in the note transport network for the tracked tags. Please prefer using Client::fetch_private_notes to avoid downloading repeated notes.

impl<AUTH> Client<AUTH>

This section of the Client contains methods for:

• Settings accessors: Methods to get, set, and delete setting values from the store.
• Default account ID: Methods to get, set, and delete the default account ID. This is a wrapper around a specific setting value.

pub async fn set_setting<T: Serializable>( &mut self, key: String, value: T, ) -> Result<(), ClientError>

Sets a setting value in the store. It can then be retrieved using get_setting.

pub async fn get_setting<T: Deserializable>( &self, key: String, ) -> Result<Option<T>, ClientError>

Retrieves the value for key, or None if it hasn’t been set.

pub async fn remove_setting(&mut self, key: String) -> Result<(), ClientError>

Deletes the setting value from the store.

pub async fn list_setting_keys(&self) -> Result<Vec<String>, ClientError>

Returns all the setting keys from the store.

impl<AUTH> Client<AUTH>

Network information management methods.

pub async fn ensure_genesis_in_place( &mut self, ) -> Result<BlockHeader, ClientError>

Attempts to retrieve the genesis block from the store. If not found, it requests it from the node and store it.

pub async fn get_current_partial_mmr(&self) -> Result<PartialMmr, ClientError>

Fetches from the store the current view of the chain’s PartialMmr.

impl<AUTH> Client<AUTH>

Tag management methods

pub async fn get_note_tags(&self) -> Result<Vec<NoteTagRecord>, ClientError>

Returns the list of note tags tracked by the client along with their source.

When syncing the state with the node, these tags will be added to the sync request and note-related information will be retrieved for notes that have matching tags. The source of the tag indicates its origin. It helps distinguish between:

• Tags added manually by the user.
• Tags automatically added by the client to track notes.
• Tags added for accounts tracked by the client.

Note: Tags for accounts that are being tracked by the client are managed automatically by the client and don’t need to be added here. That is, notes for managed accounts will be retrieved automatically by the client when syncing.

pub async fn add_note_tag(&mut self, tag: NoteTag) -> Result<(), ClientError>

Adds a note tag for the client to track. This tag’s source will be marked as User.

pub async fn remove_note_tag(&mut self, tag: NoteTag) -> Result<(), ClientError>

Removes a note tag for the client to track. Only tags added by the user can be removed.

impl<AUTH> Client<AUTH>

where AUTH: TransactionAuthenticator + Sync + 'static,

Client synchronization methods.

pub async fn get_sync_height(&self) -> Result<BlockNumber, ClientError>

Returns the block number of the last state sync block.

pub async fn sync_state(&mut self) -> Result<SyncSummary, ClientError>

Syncs the client’s state with the current state of the Miden network and returns a SyncSummary corresponding to the local state update.

The sync process is done in multiple steps:

1. A request is sent to the node to get the state updates. This request includes tracked account IDs and the tags of notes that might have changed or that might be of interest to the client.
2. A response is received with the current state of the network. The response includes information about new/committed/consumed notes, updated accounts, and committed transactions.
3. Tracked notes are updated with their new states.
4. New notes are checked, and only relevant ones are stored. Relevant notes are those that can be consumed by accounts the client is tracking (this is checked by the crate::note::NoteScreener)
5. Transactions are updated with their new states.
6. Tracked public accounts are updated and private accounts are validated against the node state.
7. The MMR is updated with the new peaks and authentication nodes.
8. All updates are applied to the store to be persisted.

pub async fn apply_state_sync( &mut self, update: StateSyncUpdate, ) -> Result<(), ClientError>

Applies the state sync update to the store.

See crate::Store::apply_state_sync() for what the update implies.

impl<AUTH> Client<AUTH>

where AUTH: TransactionAuthenticator + Sync + 'static,

Transaction management methods

pub async fn get_transactions( &self, filter: TransactionFilter, ) -> Result<Vec<TransactionRecord>, ClientError>

Retrieves tracked transactions, filtered by TransactionFilter.

pub async fn submit_new_transaction( &mut self, account_id: AccountId, transaction_request: TransactionRequest, ) -> Result<TransactionId, ClientError>

Executes a transaction specified by the request against the specified account, proves it, submits it to the network, and updates the local database.

If the transaction utilizes foreign account data, there is a chance that the client doesn’t have the required block header in the local database. In these scenarios, a sync to the chain tip is performed, and the required block header is retrieved.

pub async fn execute_transaction( &mut self, account_id: AccountId, transaction_request: TransactionRequest, ) -> Result<TransactionResult, ClientError>

Creates and executes a transaction specified by the request against the specified account, but doesn’t change the local database.

If the transaction utilizes foreign account data, there is a chance that the client doesn’t have the required block header in the local database. In these scenarios, a sync to the chain tip is performed, and the required block header is retrieved.

Errors

• Returns ClientError::MissingOutputRecipients if the TransactionRequest output notes are not a subset of executor’s output notes.
• Returns a ClientError::TransactionExecutorError if the execution fails.
• Returns a ClientError::TransactionRequestError if the request is invalid.

pub async fn prove_transaction( &mut self, tx_result: &TransactionResult, ) -> Result<ProvenTransaction, ClientError>

Proves the specified transaction using the prover configured for this client.

pub async fn prove_transaction_with( &mut self, tx_result: &TransactionResult, tx_prover: Arc<dyn TransactionProver>, ) -> Result<ProvenTransaction, ClientError>

Proves the specified transaction using the provided prover.

pub async fn submit_proven_transaction( &mut self, proven_transaction: ProvenTransaction, transaction_inputs: impl Into<TransactionInputs>, ) -> Result<BlockNumber, ClientError>

Submits a previously proven transaction to the RPC endpoint and returns the node’s chain tip upon mempool admission.

pub async fn get_transaction_store_update( &self, tx_result: &TransactionResult, submission_height: BlockNumber, ) -> Result<TransactionStoreUpdate, ClientError>

Builds a TransactionStoreUpdate for the provided transaction result at the specified submission height.

pub async fn apply_transaction( &self, tx_result: &TransactionResult, submission_height: BlockNumber, ) -> Result<(), ClientError>

Persists the effects of a submitted transaction into the local store, updating account data, note metadata, and future note tracking.

pub async fn apply_transaction_update( &self, tx_update: TransactionStoreUpdate, ) -> Result<(), ClientError>

pub async fn execute_program( &mut self, account_id: AccountId, tx_script: TransactionScript, advice_inputs: AdviceInputs, foreign_accounts: BTreeSet<ForeignAccount>, ) -> Result<[Felt; 16], ClientError>

Executes the provided transaction script against the specified account, and returns the resulting stack. Advice inputs and foreign accounts can be provided for the execution.

The transaction will use the current sync height as the block reference.

pub async fn validate_request( &mut self, account_id: AccountId, transaction_request: &TransactionRequest, ) -> Result<(), ClientError>

Validates that the specified transaction request can be executed by the specified account.

This does’t guarantee that the transaction will succeed, but it’s useful to avoid submitting transactions that are guaranteed to fail. Some of the validations include:

• That the account has enough balance to cover the outgoing assets.
• That the client is not too far behind the chain tip.

impl<AUTH> Client<AUTH>

where AUTH: TransactionAuthenticator,

Construction and access methods.

pub async fn new( rpc_api: Arc<dyn NodeRpcClient>, rng: Box<dyn FeltRng>, store: Arc<dyn Store>, authenticator: Option<Arc<AUTH>>, exec_options: ExecutionOptions, tx_graceful_blocks: Option<u32>, max_block_number_delta: Option<u32>, note_transport_api: Option<Arc<dyn NoteTransportClient>>, tx_prover: Option<Arc<dyn TransactionProver + Send + Sync>>, ) -> Result<Self, ClientError>

Returns a new instance of Client.

Arguments

• rpc_api: An instance of NodeRpcClient which provides a way for the client to connect to the Miden node.
• rng: An instance of FeltRng which provides randomness tools for generating new keys, serial numbers, etc. This can be any RNG that implements the FeltRng trait.
• store: An instance of Store, which provides a way to write and read entities to provide persistence.
• authenticator: Defines the transaction authenticator that will be used by the transaction executor whenever a signature is requested from within the VM.
• exec_options: Options that control the transaction executor’s runtime behaviour (e.g. debug mode).
• tx_graceful_blocks: The number of blocks that are considered old enough to discard pending transactions.
• max_block_number_delta: Determines the maximum number of blocks that the client can be behind the network for transactions and account proofs to be considered valid.
• note_transport_api: An instance of NoteTransportClient which provides a way for the client to connect to the Miden Note Transport network.
• tx_prover: An optional instance of TransactionProver which will be used as the default prover for the client. If not provided, a default local prover will be created.

Errors

Returns an error if the client couldn’t be instantiated.

pub fn in_debug_mode(&self) -> bool

Returns true if the client is in debug mode.

pub fn script_builder(&self) -> ScriptBuilder

Returns an instance of the ScriptBuilder

pub fn rng(&mut self) -> &mut ClientRng

Returns a reference to the client’s random number generator. This can be used to generate randomness for various purposes such as serial numbers, keys, etc.

pub fn prover(&self) -> Arc<dyn TransactionProver + Send + Sync>