One signed API. Every home in Canada.

ProofChain is the trust layer for real estate — like Plaid for banking data. Ingest signed events, read verified reports, and earn revenue share on every ProofReport that references your data.

Get sandbox keys Endpoint reference

ed25519 keys

You publish your issuer public key; every event you push carries a signature we verify at ingest time.

Merkle-anchored

Every 12 hours we anchor the day's Merkle root on-chain. Independent verifiability without on-chain gas per event.

Two-line SDK

pip install proofchain · npm install @proofchain/sdk · Rust and Go bindings shipping Q1.

Ingest — signed event

POST https://api.proofchain.io/v1/ingest/event
Authorization: Bearer <ISSUER_KEY>
Content-Type: application/json

{
  "proof_id": "PC-ON-TO-4821",
  "category": "renovation",
  "title": "Kitchen remodel — full gut",
  "date": "2026-06-04",
  "financial": {
    "cost_amount": 48200,
    "cost_currency": "CAD",
    "warranty_start": "2026-08-15",
    "warranty_end": "2031-08-15",
    "invoice_hash": "sha256:d41d8cd98f00b204e9800998ecf8427e"
  },
  "signature_ed25519": "5f3c9a7b12…8a2d"
}

Read — verified report

GET /v1/properties/PC-ON-TO-4821/report
Authorization: Bearer <READER_KEY>

200 OK
{
  "proof_id": "PC-ON-TO-4821",
  "trust_score": 87,
  "grade": "A",
  "attested_events": 41,
  "attested_by_roles": ["contractor","inspector","municipality"],
  "merkle_root": "0x9f2b…c841",
  "tier": "paid",
  "visibility": ["cost","warranty","claim"]
}

Endpoint reference

Method	Path	Issuer role	Description
POST	/v1/ingest/event	contractor · inspector	Push a signed lifecycle event to a Home Passport ID
POST	/v1/ingest/warranty	contractor · manufacturer	Attach a signed warranty record
POST	/v1/ingest/insurance	insurer	Log policy, premium, or claim outcome
POST	/v1/ingest/assessment	municipality	Assessment / tax roll ingest
POST	/v1/ingest/market	realtor_mls	Sold price, DOM, listing history
GET	/v1/properties/{proofId}/report	any	Read a verified summary at the caller's tier
GET	/v1/properties/{proofId}/events	any	Stream event history with visibility filter
GET	/v1/verify/{signature}	any	Verify an ed25519 signature offline

10–30%

Revenue share on every ProofReport that references your attestation

Zero

Cost to publish signed events — you monetize the reads, not the writes

99.99%

Uptime SLA for read endpoints on the ProofChain Trust Platform