Shake on it. Then sign it.
TrustChain turns a handshake into a signed, dated record of what you both agreed. If a client ever says "that's not what we agreed", you'll have more than a screenshot.
Your chat is end-to-end encrypted, so we can't read your messages. Anchor a signed agreement and its fingerprint goes into a dated public blockchain transaction we don't control. Change the record and it stops matching.
Example record
Agreement
Kitchen renovation, Vancouver
Fingerprint
0x71c1ab8f…be7d136
Anchored on a public blockchain. Anyone can look up the transaction and its date.
The problem
There's a standard for everything except a deal between two people.
In 2026, you can verify a payment in seconds, track a parcel across the planet, confirm a passport at a border. The world runs on standards. But a deal between two people, the kind that decides whether you get paid for a month of work, still lives as a screenshot, a text thread and a hope that the other side remembers it the way you do.
Most agreements sit as files inside platforms you don't control. They can be edited, deleted or replaced, often without a trace. And when money is on the line and the story suddenly changes, there's no independent record to point to. It comes down to your word against theirs. That isn't proof. That's a coin flip.
- Files can be edited or replaced with no trace
- Platform access can be revoked or restricted
- Screenshots are easy to dispute
- Disputes become word against word
How it works
From first message to signed proof.
01
Negotiate privately
Work out the terms in a chat that's end-to-end encrypted. The keys live on your devices, not on our servers, so only the people in the chat can read it. Not even us. Trust starts here: a private room no one else can walk into.
02
Write the agreement
Write down what you agreed and invite the other person. Nobody can sign until Sumsub has checked their ID, so there are no anonymous handles hiding in the dark.
03
Sign it
Each of you signs after your identity check. Anchor the signed agreement and a fingerprint of its ID, title, terms, amount and both account IDs is written to Polygon. Change a single character and the fingerprint comes out completely different.
04
Check it anytime
Anyone with the record's public link can open it without an account and see whether both sides signed, and when. If it was anchored, they can check its fingerprint and date on Polygon without trusting us.
Built-in AI Advisor
Know what you're signing before you sign it.
Paste a clause or describe your deal. AI Advisor explains it in plain language, flags hidden risks and suggests clearer wording, right inside TrustChain.
"Late payment penalty of 2% per month": this clause compounds monthly. On a 3,000 USD invoice unpaid for 90 days, you'd be owed about 183 USD extra…
You · follow-up 1
What if the client is in another country?
Explain any clause
A plain-language read, so you know what you're agreeing to.
Catch hidden risks
Vague wording and missing protections, flagged before you sign.
Ask, refine, revisit
2 free follow-ups per answer, your last 50 conversations saved to History.
No account needed for your first 2 questions. Free accounts get 3 a month.
Try it yourself
Change one character, get a different fingerprint.
The same fingerprint method TrustChain uses, running live in your browser. Edit the right side and watch the fingerprint change.
About this demo: it runs in your browser, and the text you type here is not sent anywhere. Real TrustChain records work differently: TrustChain stores each signed record, and its Keccak-256 fingerprint covers the record's ID, title, terms, amount and both parties' account IDs together, so pasting an agreement's text here won't reproduce a real record's fingerprint.
TrustScore
Reputation you can actually see.
Every person on TrustChain carries a TrustScore, built from verified actions: a confirmed email, an identity check, and agreements completed and anchored. Other members can see it, so honest people build a record that speaks for them.
How the score is built
Earned through verified actions, not bought.
A verified email, a completed identity check, and every agreement you finish and anchor. Completing the whole set earns a final bonus.
Account created, nothing verified yet
Identity verified, or first agreements on record
Verified identity and a real record of completed deals
A long record of completed, anchored agreements
The full set: identity, completed agreements, anchored records
Know who you're dealing with
When you open an agreement in your account, you can see the other person's TrustScore and tier. A verified, high-scoring member is a useful signal, so you're not dealing with total strangers in the dark.
Honesty is rewarded
Every completed or anchored agreement raises your score, up to a cap. Verifying your identity opens the higher tiers. Over time, your record becomes your reputation, and it follows you.
Why it matters
When disputes arise, proof matters.
You don't feel the value of a signed agreement until something goes wrong. The day a client decides not to pay, everything flips. The side holding a signed record has something solid: what was agreed, signed by both, with dates, that doesn't bend to whoever argues louder.
The record shows that both sides signed, and when, and each party keeps a copy of the exact text. Once anchored, its fingerprint is dated on a public blockchain.
- ✓Tamper-evident fingerprint for every anchored record
- ✓Anchored proof lives on Polygon, outside our control
- ✓Either party can share the record without the other's help
- ✓Every signature timestamped and logged
Plans
Start free. Pay when you need more.
Every plan includes private chat, identity checks and a public link for each signed agreement. The person you invite never pays to read, sign or keep their copy.
Free
$0
1 agreement and 3 AI Advisor requests a month, no card needed.
Pro
$19 a month
20 agreements, 20 anchors and 50 AI Advisor requests a month.
Elite
$49 a month
100 agreements, 100 anchors and 300 AI Advisor requests a month.
Guides
When the deal goes sideways, start here.
Plain answers to the questions people type at eleven at night: what to do when the work is done and the invoice is ignored, what to get in writing first, and how to prove what was agreed.
Client won't pay for finished work. What can I do?
Finished the job and the client went quiet? Five steps for today: gather your record, send a dated demand, pick your next move, know when to stop chasing.
What should a contractor get in writing before starting a job?
Five things a contractor should put in writing before starting: scope, price, change orders, deadlines, exit terms. Copy-paste example lines included.
How do I make a digital agreement without a lawyer?
Five things every freelance agreement needs, an honest comparison of email, e-sign tools and TrustChain, and a free plan for 1 agreement a month.
How do I prove what was agreed?
Verbal deal, text thread, email, signed PDF, e-signature, fingerprinted record: what each proves about content, time and identity, and where each fails.
How do I check that a signed agreement was not changed?
To check a signed agreement wasn't changed, compare it with what was fixed at signing: both originals, the signing certificate, or an anchored fingerprint.
The client says that's not what we agreed. What now?
Client says that's not what we agreed. The first reply to send, how to preserve the approval message, and how to keep the client without giving up scope.
How do I put a change to the job in writing?
Client asked for extra work? Write the change as its own dated note: what changes, the cost, the new finish date and a yes. A note to copy is included.
Can I make a side agreement with my tenant in British Columbia?
A side deal with your tenant in British Columbia: what the Residential Tenancy Act lets you change, what it voids, and how to write it down clearly.
How do I timestamp a document to prove it existed on a date?
Hash it, publish the hash, keep the original. A plain guide to proving a document existed on a date, how each method compares, and how to check by hand.
Not paid for a job in British Columbia. What are my options?
Not paid for finished work in British Columbia? The order that works: a dated written demand, the tribunal or the court, a builders lien, and the clock.
Also: the FAQ and TrustChain vs DocuSign vs a lawyer.
Templates
Plain-words templates for everyday deals.
Free to copy, change and share under CC BY 4.0. Each one covers the same five lines: the work, the price, changes, dates, and what happens if someone walks.
Small renovation or repair job agreement
A homeowner hires a trade for a job you can describe in a few lines.
Freelance project agreement
Design, development, writing or video work for one client, with a clear list of deliverables.
Loan agreement between friends
One person lends another money, with a plan to pay it back.
See all plain-words agreement templates, with the licence and how to suggest a new one.
Get it in writing
before the work starts.
Your work is real. Make the proof just as real.
Create your first agreementTrustChain: your handshake, in writing.