In brief Jack Dorsey's Block has released a new Bitcoin mining rig, aiming to disrupt the market. The machine is supposed to cut costs for miners because it has swappable parts. Dorsey is an outspoken Bitcoin advocate who has pursued numerous BTC initiatives. Decrypt’s Art, Fashion, and Entertainment Hub. Discover SCENE Jack Dorsey's fintech Block has released its latest Bitcoin product: a long-lasting mining rig with swappable parts, which will enable miners to cut costs on repairing and replacing the high-powered computing devices. Announcing the product Thursday, Block said the machine, dubbed Proto Rig, will last 10 years instead of…