SignedData

An open standard for curated, cryptographically signed, real-time data.

Problem

When you receive JSON from a third-party feed, you trust the transport, intermediaries, and source at once. There is no proof that the payload is exactly what was published, by whom, or when.

What we build

cds — the Curated Data Standard: a universal envelope for real-time data (weather, sports, lottery, news, …), signed with RSA-PSS, with an embedded summary.

mcp-lottery — MCP server exposing Brazilian lottery draws as tools for Claude and other agents.

SDKs

Language	Package	Install
Python 3.12+	`signeddata-cds`	`pip install signeddata-cds`
TypeScript	`@signeddata/cds-sdk`	`npm install @signeddata/cds-sdk`

Principles

Standard is the contract. CDS and SDKs are infrastructure-agnostic; anyone can run ingestors and operators.
Provenance, not only TLS. HTTPS secures the channel; signatures anchor the payload.
LLM-ready. Events include a context.summary so data and meaning travel together.
Curated. Structured sources, registered and fingerprinted — no unverified scraping.

Domains

Domain	Focus
`weather`	Forecasts and current conditions
`sports.football`	Results, live scores, standings
`news`	Headlines from verified publishers
`finance`	Quotes, prices, indices
`religion.bible`	Verses and passages
`government.brazil`	Diário Oficial, licitações
`lottery.brazil`	Caixa draws (Mega Sena, Lotofácil, …)