Stacks has initiated the December Weekly Builder Challenge in collaboration with Talent Protocol, emphasizing the new Clarity 4 features for Bitcoin application development. The challenge, which is hosted on the Talent Protocol platform, offers 5,000 $STX in rewards for the first week. Clarity 4 introduces significant enhancements such as asset protection, contract validation, and support for secp256r1, aiming to boost developer engagement and innovation within the community.