Cassandra is a free, publicly accessible DLC (Discreet Log Contract) oracle server built with Go and Rust. It cryptographically announces and attests to real-world financial data — specifically hourly Bitcoin price candles (open, high, low, close) across 9 fiat currencies — sourced from CryptoCompare. Attestations are fully compliant with DLC specifications and can be consumed by wallets or services to build conditional Bitcoin payment contracts. The Polymarket event source was dropped due to API reliability issues. Prices are signed using digit decomposition for efficient Contract Execution Transaction (CET) construction, with announcements made 8 weeks ahead of time.
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