bitcoinwallet-spend

This Rust crate is a direct translation from C++ to Rust of the Bitcoin Core spend wallet implementation. It provides functions for creating and signing Bitcoin transactions, selecting input coins, and estimating transaction fees.

Notice: This crate is part of a direct translation from C++ to Rust of the Bitcoin Core. As such, some of the function bodies may still be in the process of translation. Please note that this system will become testable once the translation process is complete.

The following mathematical concepts are associated with some of the tokens used in this crate:

• Output: An output in a Bitcoin transaction represents an amount of Bitcoin that is being sent to a specific Bitcoin address. The output is specified in satoshis, which are the smallest unit of Bitcoin (1 satoshi = 0.00000001 BTC).

• TxSize: The size of a Bitcoin transaction is the total number of bytes required to encode the transaction. The size is an important factor in calculating the transaction fee, which is a fee paid to the Bitcoin network to incentivize miners to include the transaction in the blockchain.

• calculate_maximum_signed_tx_size: This function calculates the maximum size of a signed Bitcoin transaction given a set of input coins and output amounts. The calculation takes into account the size of the inputs, outputs, and transaction metadata, as well as the signature size.

• calculate_maximum_signed_tx_size_with_txouts: This function is similar to calculate_maximum_signed_tx_size, but also takes into account the size of the output scripts.

• create_transaction: This function creates a new Bitcoin transaction by selecting input coins, specifying output amounts, and calculating the transaction fee. The function returns the signed transaction as a hexadecimal string.

• fund_transaction: This function is used to fund a Bitcoin transaction by selecting input coins and specifying output amounts. The function returns the unsigned transaction as a Bitcoin transaction object.

• select_coins: This function selects input coins from a list of available coins to create a new Bitcoin transaction. The function uses a coin selection algorithm to minimize the transaction fee while still including enough input coins to cover the output amounts.

• get_available_balance: This function calculates the total available balance of a Bitcoin wallet by summing the values of all unspent output coins.

• get_tx_spend_size: This function calculates the size of a Bitcoin transaction given a set of input coins and output amounts. The calculation takes into account the size of the inputs, outputs, and transaction metadata, as well as the signature size.

Overall, the bitcoinwallet-spend crate provides a set of tools for managing Bitcoin transactions, calculating transaction fees, and selecting input coins. The functions in this crate are important for building Bitcoin applications that require the ability to create, sign, and broadcast Bitcoin transactions on the Bitcoin network.