Trust Fabric (EAS Schema v2) - Droplinked Developers

Droplinked publishes a 4-axis trust fabric on the Ethereum Attestation Service (currently on Base Sepolia testnet; mainnet pending). Every claim the platform makes about a merchant — verified brand, credit-risk underwriting, repayment performance, peer trust — is anchored to an on-chain attestation that any verifier can independently audit on easscan.org.

The 4 axes

Axis	Schema	What it proves	Verifier endpoint
A — Brand	`BrandAttestation`	This brand slug controls these on-chain credentials. KYB-tier signal.	`GET /v2/attestations/brand/:slug`
B — Credit-risk	`CreditRiskAttestation`	A licensed lender has underwritten this merchant for a credit-line up to N.	`GET /v2/attestations/credit-risk/:merchantId`
C — Repayment-history	`RepaymentHistoryAttestation`	Append-only settlement record per lender. Drives tier upgrades.	`GET /v2/attestations/repayment-history/:merchantId`
D — Cross	`CrossAttestation`	Peer trust — any entity attests any other with a 0-100 score + basis.	`GET /v2/attestations/cross/{subject\|issuer}/:rootUid`

The registry trinity

Each axis is anchored by an operator-curated registry. A schema’s on-chain attestation is only authoritative if its issuer is registered + currently ACTIVE.

Registry	Anchors	Public lookup
`LenderRegistry`	Schema B + Schema C issuers	`GET /v2/lenders/:lenderId`
`ServiceProviderRegistry`	Schema D issuers (WMS/3PL partners)	`GET /admin/service-providers/:id` (admin)
`MethodologyRegistry`	Per-lender underwriting methodology hash linked from Schema B	`GET /v2/methodologies/:lenderId/active` and `GET /v2/methodologies/:lenderId/:hash`

Issuer-state mirroring

The reconciler cron sweeps every 6 hours and mirrors the registry status onto every ACTIVE attestation:

Schema B attestations carry lenderCurrentStatus + lenderCurrentStatusAt
Schema D attestations carry attestorCurrentStatus + attestorCurrentStatusAt

The reconciler never auto-revokes an attestation. It only mirrors registry state. A verifier sees:

{
  "status": "ACTIVE",                    // on-chain status (lifecycle)
  "lenderCurrentStatus": "SUSPENDED",    // registry status as of last sweep
  "lenderCurrentStatusAt": "2026-06-12T01:00:00Z"
}

…and decides whether to honor the attestation per its own policy. Verifier-side policy is load-bearing: a Schema B attestation that’s still on-chain ACTIVE but from a SUSPENDED lender may or may not be honored depending on context.

Routing surfaces

For each registry, there’s a read-only recommendation endpoint that returns the ordered list of ACTIVE issuers most-likely to serve a given merchant:

GET /v2/lender-routing/recommend?jurisdiction=AE — exact-jurisdiction first, GLOBAL fallback
GET /v2/service-provider-routing/recommend?archetype=stord — track-record sort

These endpoints route nothing themselves — the live application/mint paths stay gated on isActive at write time. Routing is a recommendation surface for portals + agents.

Composite reads

For high-leverage agent flows (the most common being “should I underwrite this merchant”), a composite endpoint bundles multiple axes into one envelope:

GET /v2/underwriting-signals/:merchantId — Schema B latest-per-lender + Schema C merchant-wide rollup + CreditTier upgrade preview + summary.anchorTier + summary.reliabilityScore

Cuts 3-4 round trips to 1 for the load-bearing lender-agent decision.

MCP tool surface

Consumer agents (ChatGPT, Claude, OpenAI Agents SDK) consume the trust fabric via the droplinked-mcp server:

Tool	Wraps
`verify_brand_attestation`	Schema A read
`verify_credit_risk`	Schema B read
`verify_repayment_history`	Schema C read
`verify_cross_attestation`	Schema D read
`get_trust_dossier`	Multi-axis composite
`verify_lender`	Lender registry lookup
`get_lender_history`	Lender lifecycle timeline (REGISTERED / STATUS_CHANGED / metadata edits, redacted)
`verify_methodology`	Methodology registry lookup by `(lenderId, hash)`
`get_methodology_timeline`	Methodology lifecycle timeline (REGISTERED / SUPERSEDED / REVOKED, redacted)
`recommend_lender`	Lender routing
`recommend_service_provider`	Service-provider routing

Mainnet

Currently on Base Sepolia testnet. Mainnet flip gated on the KMS-backed signer migration (operator-side runbook). All /v2/attestations/* endpoints return the active chain in their response so consumers can verify the on-chain receipt on the right easscan domain.

​The 4 axes

​The registry trinity

​Issuer-state mirroring

​Routing surfaces

​Composite reads

​MCP tool surface

​Mainnet