Twenty One Capital, backed by Tether, has raised an additional $100 million through the sale of convertible notes to expand its Bitcoin holdings. This brings the total capital raised to $685 million, with previous investments from Tether, SoftBank, and Bitfinex totaling $3.6 billion. The company currently holds 31,500 $BTC, making it the third-largest public Bitcoin holder, aiming to surpass MARA Holdings. Twenty One Capital is employing a leveraged Bitcoin equity trade strategy similar to Michael Saylor's Strategy, using various financing methods to increase its $BTC assets. The new convertible notes offer 1% annual interest until 2030. Unlike Strategy, Twenty One Capital plans to maintain transparency by publishing wallet addresses of its Bitcoin holdings. The growing institutional interest in Bitcoin is evident, with public companies holding over 800,000 $BTC and new entrants like Strive Asset Management and GameStop challenging early adopters.