// Package wtxmgr provides an implementation of a transaction database handling spend tracking for a bitcoin wallet. Its
// primary purpose is to save transactions with outputs spendable with wallet keys and transactions that are signed by
// wallet keys in memory, handle spend tracking for unspent outputs and newly-inserted transactions, and report the
// spendable balance from each unspent transaction output. It uses walletdb as the backend for storing the serialized
// transaction objects in buckets.
//
// Transaction outputs which are spendable by wallet keys are called credits (because they credit to a wallet's total
// spendable balance). Transaction inputs which spend previously-inserted credits are called debits (because they debit
// from the wallet's spendable balance).
//
// Spend tracking is mostly automatic. When a new transaction is inserted, if it spends from any unspent credits, they
// are automatically marked spent by the new transaction, and each input which spent a credit is marked as a debit.
// However, transaction outputs of inserted transactions must manually marked as credits, as this package has no
// knowledge of wallet keys or addresses, and therefore cannot determine which outputs may be spent.
//
// Details regarding individual transactions and their credits and debits may be queried either by just a transaction
// hash, or by hash and block. When querying for just a transaction hash, the most recent transaction with a matching
// hash will be queried. However, because transaction hashes may collide with other transaction hashes, methods to query
// for specific transactions in the chain (or unmined) are provided as well.
package wtxmgr