Yes, I'm familiar with Libbitcoin. Libbitcoin is an open-source C++ Bitcoin library that provides a variety of functionalities for developers to work with the Bitcoin protocol. It offers a set of tools, APIs, and cryptographic primitives to interact with the Bitcoin network and build Bitcoin-related applications. Libbitcoin aims to provide a flexible and modular framework for developers to create their own Bitcoin software, ranging from lightweight wallets to full nodes. It supports various features such as key management, transaction creation and validation, scripting, networking, and blockchain analysis. 

Vanity Bitcoin Address can using VGA for processing?? or only using CPU??

is this legal visa for international? or only usa?
can you give information issued??

iPhone 14 Pro Max sale $700 USD? are you kidding? where are you shipping this iphone? need custom?

how to making paypal account using your name? if your ID not know?
maybe you have paypal account with negative balance, right?

what do you thing about 12 mnemonic and only remember 7 words?
is there possible to recovery?

does Electrum work with Sparrow wallet? or even sparrow wallet is a subsidiary of electrum?