Share tax returns securely.

You need to send a tax return to a mortgage lender, an accountant, or an ex-spouse's attorney. The document contains your full name, SSN, employer, dependents, and every line item of your financial life. There is no 'send only the AGI line' path in Gmail, Dropbox, or DocuSign.

The change: Field-level sharing with cryptographic revocation.

Try a field-level share See how it works

Sample data · Live Vault demo

How it works

Four steps · every step signs a receipt.

Upload the return once · AI classifies fields at 94.8% confidence · you approve every extracted field before it enters the vault

Choose the recipient's identity or contact · select the fields they should see (AGI only? full 1040? Schedule B?)

Recipient's identity is cryptographically attested before decrypting the fields shared with them · no anonymous link forwarding

Every access emits a signed receipt · you can revoke by field or by recipient at any time

Evidence

The proof this actually works.

94.8% AI classification accuracy across 823 validated document fields (from the live Vault)
Every share emits a signed receipt with authority + policy + evidence + preconditions
Revocation is cryptographic · once revoked, the recipient cannot re-decrypt, even from a cached copy

Edge case: The mortgage underwriter needs to prove they saw a specific version — H33 anchors the version hash to Solana at notarization time
Edge case: The recipient might screenshot the fields they see · that's a fundamental limit of any sharing model, but H33 makes the screenshotted view field-limited by design

See the full proof surface →

Related capabilities

Secure Document Sharing Field-Level Privacy Controls Document Distribution Matrix Audit Logs

If you're comparing alternatives

H33 vs Docusign H33 vs Dropbox H33 vs Google Drive

Trust status

Runs today. Honest about what's next.

We publish what's shipped and what's coming — the same list on every page.

Runs today

Vault workflows running in production
Cryptographic receipts emitted per action
Immutable audit trail · Object-Locked
Auth1 · Wallet · Document · Audit APIs
Post-quantum primitives (Dilithium + Kyber)
Benchmark v12 · 2,293,766 auth/sec

Coming next

Public /verify// receipt viewer
Public /replay// decision viewer
docs.h33.you developer documentation
SOC 2 Type II Certified
Payment Requests + Rewards adapters

Ready to share tax returns securely?

Start free · or read the platform.

Start free See the platform