Cornerstone Network Apps¶

Overview¶

App	Purpose	Inputs	Outputs (to VDR)
Data Dictionary	Manage RESO + Cornerstone vocabulary	RESO definitions, domain knowledge	`credentials/contexts/cornerstone-vocab.jsonld`
Data Harmonization	Map furnisher fields to vocab	Entities (data sources), Vocab (terms)	`credentials/harmonization/mappings.json`
Entity Manager	Onboard ecosystem entities	Entity information, data source specs	`credentials/entities/*.json`
Schema Builder	Define credential structure	Vocab terms from Data Dictionary	`credentials/schemas/*.json`
VCT Builder	Credential branding & claim binding	Schema (properties), Vocab (terms), Entities	`credentials/vct/*.json`

App Dependencies¶

flowchart LR
    subgraph Vocabulary["Vocabulary Layer"]
        DD["Data Dictionary<br/>(RESO + Cornerstone)"]
        DH["Data Harmonization"]
    end

    EM["Entity Manager"]
    SB["Schema Builder"]
    VB["VCT Builder"]

    DD <--> DH
    EM --> DH
    DD --> SB
    DD --> VB
    EM --> VB
    SB --> VB

App Details¶

Data Dictionary¶

The Data Dictionary manages the canonical vocabulary for the ecosystem:

RESO Base: Industry-standard property and real estate terms
Cornerstone Extensions: Custom terms for identity, financial, and badge credentials
Output: JSON-LD context file with semantic definitions

Data Harmonization¶

Maps raw data from furnishers to canonical vocabulary terms:

Input: Entity data sources (from Entity Manager), Vocab terms (from Data Dictionary)
Output: Mapping file linking furnisher fields to RESO/Cornerstone terms
Purpose: Enables multiple furnishers to provide semantically equivalent data

Entity Manager¶

Onboards and manages ecosystem participants:

Entity Types: Data furnishers, issuers, verifiers
Data Sources: API definitions, field specifications
Logos: Visual branding for credential display

Schema Builder¶

Defines the structure of credentials:

Input: Vocabulary terms from Data Dictionary
Output: JSON Schema files for credential validation
Focus: credentialSubject structure only (JWT wrapper is spec-defined)

VCT Builder¶

Creates the complete credential type definition:

Combines: Schema (validation), Vocabulary (semantics), Entity (branding)
Defines: Display properties, claim bindings, evidence requirements
Output: The primary artifact fetched by issuance services