For appraisers · WA + OR launch

Build the work file with proof of every source.

North Star is the custodial workflow for residential appraisal — an agent helps you collect engagement letters, comparable sales, photos, sketches, and inspection notes, witnessing every input into a tamper-evident audit chain from intake to final sign-off. When you sign the report, the cryptographic Decision Record proves end-to-end custody of every fact, not just that you submitted the file.

Already have a finished work file? Evaluate runs it against 360 published compliance rules and seals the evaluation. It's the simpler implementation, so it ships first while Assembly is in active development — but Assembly is what most appraisers will reach for.

See Assembly → Or start with Evaluate

360

published rules

catalogs covered

<1s

to evaluate & seal

3-yr

offline re-verify

Two ways to work

North Star has two products. Assembly is the primary product — the custodial workflow most appraisers will use day-to-day, where the cryptographic seal carries its full weight. Evaluate is a secondary product for already-finished work files; it ships first because it's the technically simpler implementation, while Assembly is in active development.

Assembly · the primary product · in active development

Build a new work file with custodial provenance.

An agent helps you collect engagement letters, MLS comps, county records, in-field photos, sketches, and inspection notes — each one witnessed into the audit chain at the moment of capture. When you sign off, the Decision Record proves end-to-end provenance of every input.

Email + filesystem intake agent
MLS / county-records source capture with timestamps
Mobile inspection app: GPS-stamped photos, live sketch, condition notes
Field-level provenance graph — click any value to see its source
Final Decision Record carries the full custodial chain

Explore Assembly →

Evaluate · for finished work files · shipping first

Check a work file you've already built.

Three clicks — load, preview applicable rules, run — and an existing work file gets evaluated against 360 published compliance rules. Findings with citations and improvement guidance. A sealed Decision Record witnesses the evaluation event.

Upload URAR / 1004 / 1004C / 1073 / 1025 / 2090 or paste JSON
Sub-second evaluation against all applicable rules
Findings ranked by severity with citations + fixes
Cryptographic Decision Record on every run
Re-verifiable offline indefinitely

Explore Evaluate →

Waitlist members get first access to Evaluate when WA / OR opens, and first access to Assembly when the custodial workflow ships.

What the seal proves — and what it deliberately doesn't

The cryptographic Decision Record is an evaluation-event witness, not a content attestation. That framing matters — both for what you can defensibly say to a lender or attorney, and for what we'd never claim on your behalf.

What the seal attests

The exact bytes of the work file you submitted (SHA-256 content hash).
The exact moment of evaluation (RFC 3161 third- party timestamp — not back-datable).
The exact rule set applied (engine version + compiled-rules hash + jurisdiction).
The exact findings the engine produced (results hash — deterministically reproducible).
The signing identity (Ed25519 key id) — proof the record was sealed by North Star.
Continuity of evidence — every Record links to the prior one, so flipping one byte of any past Record breaks the chain at the next verify.

What the seal does not attest

That your work file is accurate. Garbage in, garbage out — the seal does not transmute it.
That your valuation is correct. Our rules evaluate compliance, not opinion of value.
That observed condition matches reported. If a report says C3 and the property is C5, the seal still passes the C-rating rule.
That comparable-sale source data is accurate. MLS / deeds / sale histories are taken from your submission as given.
That the report “passes” any standard outside our published rule set.
That the evaluation is legal advice or professional opinion. North Star is software. Use it accordingly.

Read the full audit-chain framing →

What's in the rule library

360 rules across 15 catalogs covering the residential appraisal vertical across two states (WA + OR). Authored against published public-domain sources, version- controlled internally and pinned by hash on every Decision Record, with every rule's citation traceable to the source statute, handbook, or guide.

USPAP Standards 1–4

Ethics + Record Keeping + Competency + Scope + Standards 1, 2, 3, 4 · 28 rules

Fannie Mae Selling Guide

B4-1.1 / B4-1.2 / B4-1.3 / B4-1.4 / B4-2 / B2-3 · 57 rules

Freddie Mac Topics 5600 + 5701

Only the Freddie-divergent rules · 11 rules

FHA Handbook 4000.1

Section II.D · 30 rules

VA Pamphlet 26-7

Chapters 10–16 · 20 rules

USDA HB-1-3555

Chapter 12 · 20 rules

HUD Multifamily MAP Guide

Chapter 7 · 22 rules

IRS Yellow Book / UASFLA

All 6 standards + 49 CFR Part 24 · 15 rules

ANSI Z765-2021

Measurement standard · 6 rules

Federal interagency

12 CFR 34 / 1026.42 · 20 rules

FEMA / NFIP

44 CFR Part 60 / 65, SI / SD, mandatory purchase · 10 rules

Dodd-Frank §1639h

Higher-risk loan flip rule + AMC reg · 10 rules

Washington RCW 18.140 + WAC 308-125

Starter + extended + deeper · 50 rules

Oregon ORS 674 + OAR 161

First state expansion beyond WA · 10 rules

Professional org standards

Appraisal Institute + ASA + ASFMRA · 32 rules

See the catalog scope →

Be among the first to use North Star.

We're rolling out to Washington and Oregon appraisers first. Join the waitlist and we'll reach out as soon as the platform is open for accounts. No payment required to join.

Join the waitlist