Version 1.3.0 · Pro $79.99/year · App Store and Google Play

Draft, inspect, and seal. On your terms.

HashSign™ 1.3.0 writes an NDA, MSA, letter of intent, or bill of sale on your phone, for up to five parties. 1:1 messages are end-to-end encrypted. United States signers on HashSign Pro can add a biometric face signature and verify a US government ID. Pro is $79.99/year.

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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."

Version 1.3.0

E2EE 1:1 chat On-device drafting Grok & Muse connectors SHA-384 + ML-DSA Hedera anchor

Version 1.3.0 · Pro $79.99/year

The agreement, the rules, and the seal.

Agent Connectors

Grok Connector and Muse Connector apply the standing guardrails you set, then hand the prompt to your own account. One tap opens Grok. Muse copies a prompt you paste into your own session. HashSign reads the clipboard only when you tap Import.

  • Standing guardrails you configure
  • On-device clause audit before anyone signs
  • Handoff to your own Grok or Muse account

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 dollar cap you set. Each grant is an Electronic Agent Mandate with an HSM- ID.

  • One-tap staged signatures
  • Risk score and dollar exposure caps
  • 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. HashSign Pro members show a verified badge beside their handle.

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

Messaging

End-to-End Encrypted 1:1 Direct Messaging

Direct messages use X25519 key agreement and AES-256-GCM on your device. HashSign stores ciphertext, not the private key or the message text. Resetting a device key publishes a new public key and increments keyVersion.

United States · Pro

Biometric Face Signature

A SHA-384 commitment bound to the document can be anchored on Hedera HCS. Raw frames are wiped on the device. The Pro sender pays; an invited signer can complete a required face signature without their own subscription.

United States · Pro

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. Included with HashSign Pro at $79.99/year.

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

HSM- certificate ID

An authorized agent records the Electronic Agent Mandate ID, such as HSM-GRK-7Q2M9X, on the activity log and the sealed file.

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 with a SHA-384 digest. HashSign Pro is $79.99/year on the App Store and Google Play.

Download on the App Store Get it on Google Play