Sign sale and lease contracts remotely —
With verified identity and long-term archiving.
From sale and lease contracts to unit reservations and handover reports, Wthaiq gives developers, brokers and property managers one place to close deals remotely. Collect every party's signature with verified identity that shuts out impersonation, and keep every contract with its fingerprint and event log so it stays verifiable years later.
Big deals, distant parties, and contracts that live a long time.
In real estate, huge sums turn on a single signature. The buyer is in one city, the owner in another, the broker in between. And the paper contract stays exposed to forgery, damage and loss. Any challenge to a party's identity or to the authenticity of an old copy can bring down an entire deal years after it closed. Secure, authenticated signing is no longer a luxury; it protects the asset itself.
Impersonation and fraud
With every high-value deal, the risk grows that someone signs in the name of the real owner or buyer. A paper or unverified signature leaves a wide opening for challenge and impersonation in the most valuable contracts of all.
Remote buyers and tenants
Getting the buyer, the owner and the broker into one place for a paper signature is hard. Delaying the reservation or the handover record by days to schedule meetings cools the deal down and opens the door to a withdrawal or a higher bid from someone else.
Contracts that must hold up over time
The legal standing of a sale or tenancy contract does not end when it is signed; you may be asked to prove it ten years later or more, before an official body. Paper archives decay and get lost, and ordinary computer files lose their verifiability over time.
One route for every Real estate sector documents.
Saved templates, signing with identity verification, and authenticated archiving — for every type of document the sale and lease cycle needs, from start to finish.
Sale contracts
Start from a watertight property sale template or upload your own contract, then ask each party to sign with verified identity and close the door on disputes over the most valuable document in the deal.
Sale contractLease contracts
Landlord and tenant sign remotely in an orderly sequence, with renewal alerts before the term ends. No paper appointments and no conflicting copies — just one authenticated contract whose status everyone can see in real time.
Lease contractReserving units
Lock in the client's intent immediately with a quick reservation form signed from a phone in minutes, issued with a completion certificate. You hold the unit before the interest cools or a competitor steps in.
Reservation formBrokerage and commission agreements
Document your relationship with the client and the owner through a brokerage agreement with a clear commission, signed with a verified identity. It protects your right to that commission from any later denial once the deal is done.
Brokerage agreementHandover and delivery records
Record the condition of the unit at handover in a report signed remotely by both parties. You end up with authenticated evidence bearing a fixed date that settles any later disagreement about what the tenant or buyer received.
Receipt recordPublic verification and permanent archiving
Every fully signed contract gets a number and a QR code for public verification, and is kept with its fingerprint and event log so it stays verifiable years later, with no need for your original files.
A public verification pageFrom preparing the contract to an authenticated archive.
Choose the template or upload your contract
Start from a template you saved for a sale, lease or reservation, or upload your contract as a PDF and drag signature fields onto it.
Add the parties and set their order
Set the owner, the buyer and the broker, and order the signing sequence so that no party signs before the one ahead of them.
Each party verifies their identity and signs
Each signer opens their link on their phone, confirms their identity with an official document and a face match, then signs remotely.
The contract is sealed and archived
The contract is closed with a sealed signing record and a cryptographic fingerprint, then placed in long-term archiving with a completion certificate.
Share the public verification link
Give your parties the verification reference and the QR code so that anyone, whether a person or an organization, can confirm the contract's validity at any time without an account.
Because property is a lasting asset, and its contract lasts as long as it does.
Identity verification stops fraud
Before any party signs, they go through identity verification with an official government document and a live face match. In high-value deals in particular, this shuts the door on impersonation and denial and ties the signature to one specific, real person.
Multi-party remote signing
The owner, the buyer, the broker and the legal representative all sign — each from their own place and at their own time — in an orderly sequence that keeps the order intact. No need to gather everyone in one room, and no conflicting paper copies passed around.
Long-term archiving, because property contracts last for decades
A sale or lease contract may need to be proved twenty years later. That is why the contract's fingerprint, event log and completion certificate stay preserved for verification at any time, and signing with a token embeds a PAdES signature up to LTA level that stays verifiable after the certificates expire.
A tamper-evident fingerprint, and PAdES with a token
A digital fingerprint (HMAC-SHA256 for platform contracts, SHA-256 for uploaded PDFs) is computed for the contract and recorded in the certificate of completion, so any change to the stored contract alters its fingerprint and the verification page reveals it. When signing with a token, a PAdES signature is embedded in the file itself, so the final copy carries its own evidence.
A public verification page
Every completed contract has a number and a QR code that open a public verification page showing its parties, its dates and the integrity of its signature. Any bank, authority or third party can confirm its validity in seconds, without coming back to you and without an account.
What they ask about the real estate sector.
Yes. Signing is paired with confirming each party's identity through an official document and a live face match, then sealed with a signing record and a cryptographic fingerprint, and an embedded PAdES signature is added for anyone who signs with a token. When these layers come together, denying the signature becomes all but impossible. They are built precisely for high-value deals that leave no room for doubt about who signed.
No. Each party opens their own link straight from their phone browser, confirms their identity and signs, with no app to install and no account to create. That makes signing by distant parties fast and smooth, and cuts the timeline from weeks of scheduling meetings to minutes.
Because property is an asset that lasts for decades, and proof of its contract may be demanded many years later before an official body or in a dispute. That is why the contract's fingerprint and event log stay preserved, and anyone who signs with a token gets a PAdES signature up to LTA level that stays verifiable even after the original certificates expire. So the contract does not lose its verifiability over time, as happens with ordinary files.
Every completed contract has a number and a QR code that open a public verification page showing its parties, its signing dates and the integrity of its fingerprint. Any bank, authority or later buyer can confirm the contract is genuine in seconds, from anywhere. No need for your original file, and no need to come back to you.
Yes. The system supports multi-party signing in an orderly sequence, so you set who signs first and who follows, and signing does not open for a party until the one before them has finished. This suits brokerage and commission agreements and sale contracts that bring more than one party into a single document.
Both. You can start from ready sale, lease and reservation templates, or upload your own contracts and records as PDFs and drag the signature fields onto them. Either way you get the same identity-verified signing, the same long-term archiving, and the same public verification page.
Turn every property deal into an authenticated contract that lasts.
Create the sale or lease contract, sign it remotely with your parties under verified identity, then keep it with its fingerprint and event log so it stays verifiable years later — all from one place.