What is a partially signed bitcoin transaction (PSBT)?
Could you elaborate on the concept of a partially signed bitcoin transaction (PSBT)? As a financial and cryptocurrency practitioner, I'm interested in understanding its significance and usage in the Bitcoin ecosystem. Specifically, I'd like to know how it differs from a traditional Bitcoin transaction, what are its key features, and in which scenarios is it typically utilized? Understanding PSBTs seems crucial in today's cryptocurrency landscape, given the growing need for secure and efficient transactions.