Japanese Bitcoin treasury company, Metaplanet, has issued $13 million in zero-interest bonds to expand its BTC reserves.The bonds are allocated via the company's Evo fund, and investors can redeem them at full face value by September 30.Metaplanet aims to accumulate 10,000 BTC by 2025 and 21,000 BTC by 2026, and currently holds 3,350 BTC.The strategy of aggressive Bitcoin accumulation by public companies, popularized by MicroStrategy, is gaining traction.