Second, and more cleverly: he implemented a hash verification check on nozzle.js. The exact implementation could have been Subresource Integrity (SRI), a custom self-hashing routine, or a server-side nonce system, but the effect was the same. When the browser (or the application itself) loaded the script, it compared the modified file against a canonical hash and if it did not pass the check, the player would never initialise.
"But by proving the technology it really opens the door for an economically viable product, where things can be made in space and return to Earth and have use and benefit to everybody on Earth. And that's really exciting."
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