---
title: "Find timestamped changes across released evidence dimensions for a resolved property since a caller-supplied timestamp, with deterministic change fingerprints, source-snapshot digests, per-source observational summaries, explicit timestamp semantics, source gaps, and a machine-readable next-check contract for repeat polling."
method: POST
path: "/v1/property/changes"
---

# Find timestamped changes across released evidence dimensions for a resolved property since a caller-supplied timestamp, with deterministic change fingerprints, source-snapshot digests, per-source observational summaries, explicit timestamp semantics, source gaps, and a machine-readable next-check contract for repeat polling.

`POST /v1/property/changes`

## Request

- Base URL: `https://localproof.davisvillelabs.com`
- URL: `https://localproof.davisvillelabs.com/v1/property/changes`
- Auth: none declared

## Request body

- object: Repeat-poll one resolved property for supported changes after a caller-supplied observation time.
  - `address` string, required: Street address or place to research. Include locality information when available.
  - `city` string: Optional city used to disambiguate the address and route it to a supported LocalProof jurisdiction.
  - `state` string: Optional state name or abbreviation. Current released jurisdictions are in California; use CA or California.
  - `unit` string: Optional unit, suite, or apartment identifier when it is relevant to property identity.
  - `since` string, date-time, required: ISO 8601 date or date-time. LocalProof returns supported changes observed after this instant; the value cannot be in the future.

## Response `200`

LocalProof result with additive Davisville Receipt Envelope v1

- object

## Other responses

- `402`: Stablecoin payment required
- `422`: Unsupported, ambiguous, or insufficient evidence

---

[API](https://skmtc.dev/davisvillelabs/apis/localproof-api.md) · [All operations](https://skmtc.dev/davisvillelabs/apis/localproof-api/llms.txt) · [OpenAPI document](https://skmtc.dev/davisvillelabs/apis/localproof-api/revisions/07d17aa8c071?raw)