A recently released journal article by researchers at BTQ, a startup focused on developing quantum-resistant blockchain technology, introduces a new approach to the Proof of Work (PoW) algorithm utilizing quantum technology.
Proof of Work is a blockchain consensus mechanism that secures the Bitcoin network by having participants solve complex mathematical problems to validate transactions. The energy-intensive nature of this process has sparked debates among experts.
Quantum computing, on the other hand, operates on qubits that can exist in multiple states simultaneously, offering significantly higher computational power than traditional binary systems. This advancement poses a threat to current encryption methods used by classical computers.
The BTQ researchers propose a quantum-based alternative known as Coarse-Grained Boson Sampling (CGBS), which utilizes bosons to generate unique patterns reflecting the blockchain’s state, rather than relying on hash-based puzzles.
By randomly sampling these patterns, encryption can be achieved similar to how random numbers are used in classical encryption. Boson-sampling was originally developed to showcase quantum supremacy, where a problem becomes too complex for classical computers to solve.
These samples are organized into bins, making it easier to validate results and confirm the miner’s work. This approach replaces the energy-intensive cryptographic puzzles of PoW with more efficient quantum sampling tasks, ensuring network security and decentralization.
Implementing BTQ’s proposal would require a significant effort, including a hard fork of the Bitcoin network to transition miners and nodes from ASIC-based hardware to quantum-ready infrastructure. This transition could potentially lead to a network fork, similar to past events like the Blocksize Wars.
Read more: The Blocksize Wars Revisited: How Bitcoin’s Civil War Still Resonates Today