Blockchain funds lead all other ETFs from a performance standpoint as August comes to an end -- and over a one-month period, these three funds stick out the most. August's three top-performing ETFs (excluding leveraged and inverse funds) are the Viridi Cleaner Energy Crypto-Mining & Semiconductor ETF (NYSEARCA:RIGZ), Global X Blockchain ETF (NASDAQ:BKCH), and VanEck Vectors Digital Transformation ETF (NASDAQ:DAPP). RIGZ is +23.99% over the past month, while BKCH is +18.31% and DAPP is +17.81%. Blockchain ETFs have surged amid soaring prices for crypto assets such as Bitcoin (BTC-USD) and Ethereum (ETH-USD). Bitcoin is +15.40% so far in August, while Ethereum is +33.47%. While RIGZ, BKCH and DAPP don't directly hold positions in crypto, they all invest in the industry indirectly. The ETFs invest in companies involved in crypto mining, digital asset exchanges, payments, services, storage, e-commerce and more. All three ETFs are newly launched. RIGZ came to market on July 20, while BKCH came forward on July 12