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Pick an offshore wind farm and a day. Your browser rebuilds every certified half-hour from public data and compares the result with what is recorded on the Sepolia blockchain. No trust in the issuer needed.
One slot per half-hour. Click a bar to pick it for the tamper test below.
What is still trusted: the oracle, the public data sources and the issuer key. ERA5 wind data has about 25 km resolution. A flagged interval means "flagged for audit", not "fraud". Source and method are in the project repository.