# API Gateways and Resolver Interfaces

#### **8.2.1 The Role of APIs and Resolvers in NSF**

To operate within a federated, sovereign, and machine-verifiable governance architecture, NSF must expose:

* **Secure access points** for simulation input and clause triggering
* **Resolvers** for credential, clause, and simulation object verification
* **Standard APIs** for external systems (e.g., DAOs, cities, UN agencies) to interoperate with the protocol’s core logic

This layer ensures **interoperability at the data and interaction level**, enabling:

* Clause and credential verification by institutions
* Real-time access to simulation results
* Rule-bound triggering from digital twins, oracles, and treaty systems
* Policy execution across hybrid infrastructures

***

#### **8.2.2 API Gateway Design Objectives**

All NSF APIs follow the following design principles:

| Principle             | Description                                                                         |
| --------------------- | ----------------------------------------------------------------------------------- |
| **Verifiability**     | Every request is auditable, signed, and can be traced through CAC and DAO states    |
| **Minimal Trust**     | Gateways operate under zero-trust assumptions, with verification on the client side |
| **Modular**           | Interfaces are modular for domain-specific integrations (climate, finance, health)  |
| **Encrypted**         | Transport and payload security via TLS 1.3, DIDComm where applicable                |
| **Standards-Aligned** | REST/GraphQL + support for OpenAPI, JSON-LD, and ISO geospatial schema              |

***

#### **8.2.3 Gateway Categories**

| API Gateway Type                | Core Use                                                             |
| ------------------------------- | -------------------------------------------------------------------- |
| **Clause Execution Gateway**    | Trigger, monitor, or verify clause lifecycle events                  |
| **Credential Resolver Gateway** | Verify VC status, revocation, issuer, and chain-of-trust             |
| **Simulation Input Gateway**    | Inject real-time or historical risk data for forecast execution      |
| **Audit Log Gateway**           | Query zero-knowledge or signed event logs for any system object      |
| **DAO Proposal Gateway**        | Submit or review governance proposals or dispute resolutions         |
| **Twin Interface Gateway**      | Interact with external digital twins or system APIs (e.g., WMO, WHO) |

***

#### **8.2.4 Clause Resolution Interface**

Each clause has a resolvable URI under:

```
https://nsf.global/resolve/clause/{clause_id}
```

This interface provides:

* Clause metadata and DSL
* Governance status (draft, active, deprecated)
* Trigger history and CAC execution proofs
* Linked simulation runs and SimulationRunVCs
* Credential dependencies and jurisdictional constraints

***

#### **8.2.5 Credential Resolver Interface**

Verifies any NSF-issued credential via:

```
https://nsf.global/resolve/credential/{vc_hash}
```

Returns:

* VC subject, issuer, scope, domain
* Revocation status (via Merkle Tree or CRL endpoint)
* Binding to clause, DAO, or simulation context
* DID anchor and issuer registry
* Audit proof of issuance and current validity

Also supports **VC bundling and dependency tree parsing**.

***

#### **8.2.6 Simulation API Endpoint**

Provides public access to simulation status:

* Template availability and version lineage
* Input schema and ingestion methods
* Current execution queue and forecast latency
* Results from specific simulations
* Verifiable output hashes

REST and GraphQL query formats are available, with optional CAC proof bundles.

***

#### **8.2.7 Trigger API Interface**

Used by external systems (digital twins, satellites, treaty monitors) to securely signal clause conditions:

```http
POST /trigger/clause-event
{
  "clause_id": "FloodRelief@3.2",
  "signal_type": "external_sim_trigger",
  "data_reference": "WMO-Twin#0xabc...",
  "signatures": ["0xDAO-approved-sig", "..."]
}
```

These triggers are processed through:

* Simulation replay (optional)
* DAO-based conditional review
* CAC queue validation
* Clause execution queue

***

#### **8.2.8 Audit and Forensics API**

Every interaction with a clause, credential, simulation, or DAO can be queried through:

```
/audit/{object_type}/{object_id}
```

Returns ZK-bound or signed forensic bundles including:

* Execution trace
* Simulation forecast state
* DAO votes
* Credential dependencies
* Systemic effect logs (e.g., cascade graphs)

This creates an **on-chain/off-chain audit bridge**, ensuring total accountability.

***

#### **8.2.9 External Integration Standards**

All NSF APIs conform to:

* **OpenAPI v3** for interface specification
* **JSON-LD** and **VC-Data-Model** for semantic interoperability
* **ISO/IEC 19944** for data usage control
* **OGC standards** for geospatial data interchange
* **W3C DID Resolution** for identity lookup and trust anchor federation

***

#### **8.2.10 Resolver Interface Security and Governance**

* All gateways are mirrored globally for failover and redundancy
* DID-based access control lists (ACLs) manage permissioned use
* Quorum-signed resolvers exist for critical clause and credential lookups
* Abuse protection includes rate limiting, credential-bound API keys, and forensic alerting
* Gateways are deployed at both national and transnational levels to support multilateral integration

***

These API and resolver systems form the **connective tissue** between NSF's internal logic and the broader world of institutional foresight, treaty operations, city-scale twins, and risk observatories.


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