The Chainlink Fall 2021 Hackathon, starting on October 22, 2021, invites developers, creators, and blockchain enthusiasts to compete for over $300,000 in prizes, providing an opportunity to learn from industry experts and advance smart contract development. This follows the success of the ETHGlobal's 2020 ETHOnline Hackathon, where Chainlink sponsored and celebrated five winning projects that effectively integrated Chainlink technology. These projects included Iroiro, a platform for supporting creators; Overlay, a DeFi data stream derivatives protocol; Rupia, an INR stablecoin derivative; SecretPay, enabling private ETH purchases via PayPal and Revolut; and Unipeer, a fiat-to-Ethereum on-ramp using open banking APIs. Each project showcased the innovative use of Chainlink's decentralized oracle network to enhance smart contract functionality and connectivity, thereby contributing to the development of secure decentralized technology.