The platform
One system, from source to citation.
Not a wrapper around someone else’s model. TerraSift owns every stage between a source entering the corpus and a citation reaching your page.
Sources, tiered and versioned
Assessment reports, journals, agency feeds and your own documents, each placed in a tier before retrieval and pinned to a corpus version you can cite.
Search that reads, not matches
Dense semantic retrieval across the whole corpus, then cross-encoder reranking, so the passages that address the claim beat the ones that merely share its words.
The tier model, applied the same way every time
Weight comes from where evidence sits, not how often it repeats. Dissent is surfaced and described rather than averaged away.
An answer that shows its working
Passages, scores, page references, rejected candidates and model configuration are kept together, so any check can be reopened months later.
A desk to work in, an API to build on
A verification workspace for people who check claims all day, a REST API for your CMS or research pipeline, and exports your compliance team can file.
Wherever your evidence has to live
Your hardware, your private cloud, or our EU-hosted instance. The same system in each case — nothing is held back for the cloud edition.
The method
How a claim is settled.
Five stages, in order. The same five whether the claim arrives from a newsroom at 4pm or from an assurance review with a three-week window.
Parse the claim
Separate the falsifiable assertion from the framing around it, and state plainly what would have to be true for it to hold.
Retrieve wide
Semantic search across the vetted corpus and live agency data — not a web search, and not a lookup of what other people concluded.
Rerank
A cross-encoder pushes the passages that genuinely address the claim above the ones that merely share its vocabulary.
Weigh, don’t count
Evidence is scored by tier. Ten aligned blog posts do not outweigh one assessment chapter, and volume never stands in for weight.
Answer with the trace
A verdict, its uncertainty, and every sentence tied to a page in a named source. Where the literature disagrees, the disagreement is described rather than resolved.
Then: the audit file
Query, corpus version, model configuration and retrieved passages are kept, so the check can be reproduced months later.
The evidence base
Weighed, not counted.
Every source in the corpus is placed in one of four tiers before it is ever retrieved. The tier travels with the passage, so you can always see what a verdict is resting on — and how far it is from bedrock.
Tier 4 exists to give context and locate the claim in public debate. It is never load-bearing on its own.