Texas-based, veteran-owned

Sign documents with a tamper-evident SHA-384 record

HashSign AI flags risky clauses, and sealed PDFs get a tamper-evident SHA-384 record. Start free; Hedera anchoring is a paid feature. The document stays on your device until you send or share it. HashSign is not a licensed notary and does not replace one.

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My Contracts

NDA — Acme Corp

3 pages · PDF

Signed

SHA-384 · bc4f…a91d · Hedera anchored

Service Agreement

7 pages · PDF

Inspect

2 clauses flagged on this device

"Uncapped liability. Outside your standing rules."

iOS and Android

Encrypted messaging On-device drafting HashSign AI SHA-384 + ML-DSA Hedera anchor

Free to start

The agreement, the rules, and the seal.

Agent Connectors

Optional assistant handoffs apply the standing guardrails you set, then hand the prompt to a session you control. HashSign reads the clipboard only when you tap Import.

  • Standing guardrails you configure
  • On-device clause audit before anyone signs
  • Handoff to a session you control

Co-Pilot and policy Auto-Sign

Co-Pilot stages your saved signature for a one-tap seal. Auto-Sign seals only when the agreement is an allowed type, clears every standing rule, and stays inside the risk score and exposure cap you set. Each grant is an Electronic Agent Mandate.

  • One-tap staged signatures
  • Risk score and exposure caps you set
  • SHA-384 anchor and ML-DSA audit trail

Multi-party drafting and Legal Inspect

Draft an NDA, MSA, letter of intent, or bill of sale on the device for up to five parties. An @handle is checked against the HashSign member who owns it. Legal Inspect flags traps and scores risk on the device. Cloud boost and Deep review run only when you tap them.

  • Up to five signing parties
  • NDA, MSA, LOI, and bill of sale
  • On-device trap and risk detection

Profile photos and Deal Rooms

Add a profile photo, cropped on your phone, next to your @handle. A Deal Room is one conversation for the signing group and the documents in the deal. A subscription badge can appear beside a member's handle.

  • 512 px photo, compressed before upload
  • One room for the whole signing group
  • Subscription badge on a member @handle

Messaging

Encrypted 1:1 messaging

Direct messages are encrypted on your device before they are stored. HashSign stores ciphertext, not the private key or the message text. Resetting a device key publishes a new public key.

United States only

Biometric Face Signature

Face Signature is US-only. A SHA-384 commitment bound to the document can be anchored on Hedera. Anchoring is a paid feature. Raw frames are wiped on the device. An invited signer in the United States can complete a required face signature.

United States only

US Government ID Verification

A driver's license, state ID, or passport is read on the device. HashSign keeps a redacted attestation, not the ID photo or the ID number. US ID verification is US-only.

Seal

SHA-384 on Hedera

The finished PDF is hashed on your device. That digest, not the contract, is what gets anchored.

Post-quantum

ML-DSA signature

An ML-DSA signature covers the document manifest. The SHA-384 anchor covers the finished file.

Mandate

Electronic Agent Mandate

An authorized agent records the Electronic Agent Mandate on the activity log and the sealed file. A SHA-384 digest shows the file has not changed since it was sealed. It does not prove who signed it.

Simple workflow

Three steps to a sealed agreement.

1

Draft

Name up to five parties, by legal name or @handle, and draft on the device.

2

Inspect

Standing rules and trap detection run locally. Cloud review waits for your tap.

3

Seal

Stage it in Co-Pilot, or let Auto-Sign seal inside your caps. Then anchor the SHA-384 digest.

Available now

Get HashSign™
on your phone.

Draft on your phone, inspect against your own rules, and seal a tamper-evident SHA-384 record. Start free. Hedera anchoring is a paid feature.

Download on the App Store Get it on Google Play