Parametric insurance · data provenance

Prove what the data said, and when.

Parametric policies and catastrophe bonds pay out when weather or earthquake data crosses a threshold. Disputes are almost always about the data: what it showed at the trigger time, whether it was revised later, and whether it was even available. Weather Custody keeps signed, verifiable records of exactly that.

Open source on GitHub Pro edition on request

Live results, first day

35 / 35GOES-19 rainfall files byte-identical on AWS, Google Cloud and Azure

0 changedof 105 mirror copies when re-downloaded and re-verified

12 smedian time for AWS to publish after the satellite scan (Azure 20 s, Google 25 s)

M4.7 vs M3.7one Philippines quake, as reported by USGS and EMSC: the kind of gap that decides a claim

When a later revision changes the answer

Earthquake solutions are revised after the fact. A policy that triggers at magnitude 6.0 needs to know what the official source said at the trigger moment, and whether a later revision crossed the line.

Illustration. At 05:00 the witnessed record shows M5.8, below the trigger; the ledger also flags that a later revision crossed it. Both facts are signed and time-stamped.

Two editions

Open source · Apache-2.0

wx-custody

NOAA GOES satellite products from the AWS, Google Cloud and Azure mirrors
Every file downloaded from each cloud and hashed independently; the mirrors' own checksums checked, not trusted
Verdict per file: agreed on all three, partial, single source or discrepancy
Missing scan slots and each mirror's publication delay recorded
Signed receipts, one root per window to anchor on a public ledger, and a verifier anyone can run

View on GitHub

Pro · on request

Weather Custody Pro

USGS earthquakes: every version of every event, cross-checked against EMSC, with alerts when a revision crosses your threshold
NEXRAD radar: every volume scan fingerprinted at first sight, radar outages recorded, later file changes flagged
Trigger-time lookup: what each source said at the moment your policy cares about, with the evidence
Append-only, signed ledgers where any edit, deletion or reordering fails verification
Continuous hosted witnessing, dispute reports and ledger exports

Request Pro

What the records do, and don't, claim

They prove what a public source published, and when it was seen. Not conditions on the ground.
"As of" means witnessed at or before that moment. Times before witnessing started cannot be reconstructed, which is why Pro witnesses continuously.
Agreement is only as independent as the sources. EMSC sometimes republishes the USGS solution, and NEXRAD currently has one public mirror; records say so.

Request Weather Custody Pro

For parametric insurers, MGAs, reinsurers, catastrophe-bond calculation agents and claims teams. Tell us the regions, perils and sources your programs trigger on, and we will set up an evaluation.

Email embryospace@gmail.com