+/**
+ * The `Confirm` trait is used to notify when transactions have been confirmed on chain or
+ * unconfirmed during a chain reorganization.
+ *
+ * Clients sourcing chain data using a transaction-oriented API should prefer this interface over
+ * [`Listen`]. For instance, an Electrum client may implement [`Filter`] by subscribing to activity
+ * related to registered transactions and outputs. Upon notification, it would pass along the
+ * matching transactions using this interface.
+ *
+ * # Use
+ *
+ * The intended use is as follows:
+ * - Call [`transactions_confirmed`] to process any on-chain activity of interest.
+ * - Call [`transaction_unconfirmed`] to process any transaction returned by [`get_relevant_txids`]
+ * that has been reorganized out of the chain.
+ * - Call [`best_block_updated`] whenever a new chain tip becomes available.
+ *
+ * # Order
+ *
+ * Clients must call these methods in chain order. Specifically:
+ * - Transactions confirmed in a block must be given before transactions confirmed in a later
+ * block.
+ * - Dependent transactions within the same block must be given in topological order, possibly in
+ * separate calls.
+ * - Unconfirmed transactions must be given after the original confirmations and before any
+ * reconfirmation.
+ *
+ * See individual method documentation for further details.
+ *
+ * [`transactions_confirmed`]: Self::transactions_confirmed
+ * [`transaction_unconfirmed`]: Self::transaction_unconfirmed
+ * [`best_block_updated`]: Self::best_block_updated
+ * [`get_relevant_txids`]: Self::get_relevant_txids
+ */
+typedef struct LDKConfirm {
+ /**
+ * An opaque pointer which is passed to your function implementations as an argument.
+ * This has no meaning in the LDK, and can be NULL or any other value.
+ */
+ void *this_arg;
+ /**
+ * Processes transactions confirmed in a block with a given header and height.
+ *
+ * Should be called for any transactions registered by [`Filter::register_tx`] or any
+ * transactions spending an output registered by [`Filter::register_output`]. Such transactions
+ * appearing in the same block do not need to be included in the same call; instead, multiple
+ * calls with additional transactions may be made so long as they are made in [chain order].
+ *
+ * May be called before or after [`best_block_updated`] for the corresponding block. However,
+ * in the event of a chain reorganization, it must not be called with a `header` that is no
+ * longer in the chain as of the last call to [`best_block_updated`].
+ *
+ * [chain order]: Self#order
+ * [`best_block_updated`]: Self::best_block_updated
+ */
+ void (*transactions_confirmed)(const void *this_arg, const uint8_t (*header)[80], struct LDKCVec_C2Tuple_usizeTransactionZZ txdata, uint32_t height);
+ /**
+ * Processes a transaction that is no longer confirmed as result of a chain reorganization.
+ *
+ * Should be called for any transaction returned by [`get_relevant_txids`] if it has been
+ * reorganized out of the best chain. Once called, the given transaction should not be returned
+ * by [`get_relevant_txids`] unless it has been reconfirmed via [`transactions_confirmed`].
+ *
+ * [`get_relevant_txids`]: Self::get_relevant_txids
+ * [`transactions_confirmed`]: Self::transactions_confirmed
+ */
+ void (*transaction_unconfirmed)(const void *this_arg, const uint8_t (*txid)[32]);
+ /**
+ * Processes an update to the best header connected at the given height.
+ *
+ * Should be called when a new header is available but may be skipped for intermediary blocks
+ * if they become available at the same time.
+ */
+ void (*best_block_updated)(const void *this_arg, const uint8_t (*header)[80], uint32_t height);
+ /**
+ * Returns transactions that should be monitored for reorganization out of the chain.
+ *
+ * Should include any transactions passed to [`transactions_confirmed`] that have insufficient
+ * confirmations to be safe from a chain reorganization. Should not include any transactions
+ * passed to [`transaction_unconfirmed`] unless later reconfirmed.
+ *
+ * May be called to determine the subset of transactions that must still be monitored for
+ * reorganization. Will be idempotent between calls but may change as a result of calls to the
+ * other interface methods. Thus, this is useful to determine which transactions may need to be
+ * given to [`transaction_unconfirmed`].
+ *
+ * [`transactions_confirmed`]: Self::transactions_confirmed
+ * [`transaction_unconfirmed`]: Self::transaction_unconfirmed
+ */
+ struct LDKCVec_TxidZ (*get_relevant_txids)(const void *this_arg);
+ /**
+ * Frees any resources associated with this object given its this_arg pointer.
+ * Does not need to free the outer struct containing function pointers and may be NULL is no resources need to be freed.
+ */
+ void (*free)(void *this_arg);
+} LDKConfirm;
+