---
title: "Ontology and Cyber-Market Fusion"
description: "Record sourced claims and connect company relationships to cyber and market events."
canonical: https://y2.dev/docs/ontology/
---

Ontology & Fusion

# Ontology and Cyber-Market Fusion

Record sourced claims and connect company relationships to cyber and market events.

Y2 connects research through two layers:

- **Entity ledger:** your workspace's record of sourced claims about people, organizations, and systems.
- **Cyber-market fusion:** a timeline of events about a company and the parties connected to it.

The ledger retains earlier claims when you correct them. Fusion combines those claims with Y2's shared catalog.

## Tutorial

[Read a company ledger](https://y2.dev/docs/ontology/tutorial): Check a supplied local example, inspect its supplier claim, and produce a STIX bundle.

## How-to guides

- [Record a claim with evidence](https://y2.dev/docs/ontology/how-to/record-evidence)
- [Correct, supersede, or retract a claim](https://y2.dev/docs/ontology/how-to/correct-a-claim)
- [Read the ledger at a point in time](https://y2.dev/docs/ontology/how-to/read-at-a-point-in-time)
- [Export STIX and verify the seal](https://y2.dev/docs/ontology/how-to/export-and-verify)

## Reference

- [Ledger record format](https://y2.dev/docs/ontology/reference/ledger-format)
- [Vocabulary](https://y2.dev/docs/ontology/reference/vocabulary)
- [STIX 2.1 export](https://y2.dev/docs/ontology/reference/stix-export)
- [Fusion response](https://y2.dev/docs/ontology/reference/fusion)
- [Ontology Ledger API](https://y2.dev/docs/api/ontology-ledger)

## Explanation

- [Why a claim ledger](https://y2.dev/docs/ontology/explanation/claim-ledger)
- [Cyber-market fusion](https://y2.dev/docs/ontology/explanation/cyber-market-fusion)
- [Catalog and ledger alignment](https://y2.dev/docs/ontology/explanation/catalog-alignment)