NIST and the University of Colorado Boulder have launched CURBy, a publicly available random number generator based on quantum nonlocality, offering verifiable, truly random numbers. At the heart of this service is the NIST-run Bell test, which provides truly random results. This randomness acts as a kind of raw material that the rest of the researchers’ setup “refines” into random numbers published by the beacon. The Bell test measures pairs of “entangled” photons whose properties are correlated even when separated by vast distances. When researchers measure an individual particle, the outcome is random, but the properties of the pair are more correlated than classical physics allows, enabling researchers to verify the randomness. Einstein called this quantum nonlocality “spooky action at a distance.” This is the first random number generator service to use quantum nonlocality as a source of its numbers, and the most transparent source of random numbers to date. That’s because the results are certifiable and traceable to a greater extent than ever before. CURBy uses entangled photons in a Bell test to generate certifiable randomness, achieving a 99.7% success rate in its first 40 days and producing 512-bit outputs per run. A novel blockchain-based system called the Twine protocol ensures transparency and security by allowing users to trace and verify each step of the randomness generation process. CURBy can be used anywhere an independent, public source of random numbers would be useful, such as selecting jury candidates, making[A1] [A2] a random selection for an audit, or assigning resources through a public lottery.