Bitcoin (BTC) has been a terrific store of value but a terrible yield asset. Fortunately, the days of sub-0.5% BTC yields are ending. Emerging opportunities in Bitcoin’s layer-2 (L2) and decentralized finance (DeFi) ecosystems are game changers. Here’s how to prepare for the coming BTC yield boom. Bitcoin mining used to be the only way to earn meaningful BTC rewards. Regular holders had to settle for sketchy centralized finance (CeFi) platforms — such as now-defunct Celsius and Voyager — or pitiful DeFi yields. As of Sept. 5, DeFi lending platform Aave was paying Wrapped Bitcoin (WBTC) deposit…