"Bitcoin Ecosystem: Unveiling the Era of Trustless Finance" is a research report on various aspects of the Bitcoin ecosystem's development. This report was jointly authored by the Spartan Group team, Kyle Ellicott, and several experts who generously provided feedback and insights, dedicating their time to reviewing the final version of this document. The report was drafted in December 2023, and the data is accurate as of the time of writing. This piece is the fourth installment in a series of four articles.