The recent surge in blockchain applications has accelerated the research in designing efficient decentralized currencies. Building a decentralized economy on the traditional byzantine fault-tolerant (BFT) protocols or the Proof-of-Work (POW) consensus protocol is inadequate as the immutability of the ledger created by the former is at the mercy of the long-term safe-keeping of private keys of participants, while the latter yields an extremely inefficient and environmentally unsustainable consensus. To ameliorate this situation, we envision the design of our HYBRIDCHAIN architecture, which offers the best of both worlds. Our HYBRIDCHAIN design runs a traditional BFT protocol to commit client transactions and employs our novel Power-of-Collaboration (POC) protocol to notarize the BFT chain. Unlike POW, our POC protocol advocates for participants to work together collaboratively instead of competing (often selfishly), which results in a safe, high-throughput, and resource-efficient consensus design.