labs@atheron:~/industries/legal/web3$ deploy contract --audited

Evidence timestamping

File fingerprints on a public blockchain, for legal teams.

Proving a file has not changed since a given day is a narrow job a public chain does well: anyone can check the record, and nobody, including us, can alter it. We also explain the alternative, a trusted timestamping authority, because for many firms it is enough.

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// what matters here

What is different in this industry.

Fingerprints only

Each file is reduced to a fingerprint in your browser. The document itself never leaves your systems and nothing confidential is published.

Checkable by anyone

The other side, the court or an expert can verify the fingerprint against the public chain without trusting the firm or us.

Reports a court can follow

The verification report explains in plain language what was recorded, when, and how to check it independently.

Honest about alternatives

An RFC 3161 timestamping authority gives a similar proof without a chain. We set out the difference and build whichever suits your matters.

// example projects

Priced examples for this service.

Each one is hypothetical, labelled as such, and priced live from our rate card. Open any of them in the estimator and make it yours.

Example projectWeb appWeb3

Evidence on a public chain

Hypothetical. Not a client, not a result.

// The problem

A firm needs to show that a document or a set of files existed in a given form on a given day, and an email timestamp is easy to dispute.

// What we would build

A service that records a fingerprint of each file, never the file itself, in a small contract on a public chain, with a portal to register files and produce a verification report. A trusted timestamping authority under RFC 3161 does a similar job without a chain; we explain both and you choose.

// What is in it

Files fingerprinted in the browser, so the content never leaves your systems
Fingerprints recorded on a public chain anyone can check independently
A verification report showing the fingerprint, the block and the time
Batch registration for evidence sets and disclosure productions
A contract audited before it is deployed

// Stack

Solidity
Ethereum layer 2
Next.js
PostgreSQL
AWS

// estimate

Build: ≈ US$68,800 to US$105,000, delivered within 20 weeksCAD 97,900 to 149,800
Hosting: ≈ US$176 a monthCAD 250 a month
Support: ≈ US$2,500 a monthCAD 3,565 a month

Prices in your currency are estimates from today's Bank of Canada rate. All invoicing is in CAD or USD.

Timeline by milestone

Discovery: 2.9 to 3.4 weeks
Specification: 0.4 weeks
Design approved: 2.4 to 3.9 weeks
Core features: 1.4 to 2.4 weeks
Full build: 0.9 to 1.4 weeks
Contracts and tests: 1.4 to 2.4 weeks
Testing and fixes: 0.4 weeks
Testnet deployment: 2.9 to 3.4 weeks
Launch: 0.9 to 1.4 weeks
Mainnet: 0.9 to 1.4 weeks

Outside our hands, and added to the calendar

An outside audit of the contracts, if you want one: 2 to 4 weeks
API access from your software vendor: 1 to 4 weeks

How it is paid

Deposit 20%: CAD 19,580 to 29,960
Discovery 4.2%: CAD 4,111.80 to 6,291.60
Specification 5.3%: CAD 5,188.70 to 7,939.40
Design approved 4.2%: CAD 4,111.80 to 6,291.60
Core features 12.6%: CAD 12,335.40 to 18,874.80
Full build 8.4%: CAD 8,223.60 to 12,583.20
Contracts and tests 16%: CAD 15,664 to 23,968
Testing and fixes 4.2%: CAD 4,111.80 to 6,291.60
Testnet deployment 5.3%: CAD 5,188.70 to 7,939.40
Launch 4.2%: CAD 4,111.80 to 6,291.60
Mainnet 5.6%: CAD 5,482.40 to 8,388.80
Holdback, 30 days after launch (10%): CAD 9,790 to 14,980

Start from this example

// questions

Questions we get about this.

Is a blockchain timestamp accepted as evidence?

That is for your practitioners and the court to judge in each case; we do not give legal advice. What we provide is a clear, independently checkable record and a report that explains it.

Do confidential documents go on a public chain?

No. Only a fingerprint is recorded. It cannot be turned back into the document, and the document stays in your systems.

What does each evidence timestamp cost to record?

Fingerprints are batched into one transaction on a low-cost network, so recording is a small running cost. The estimate shows hosting separately from the build.

Back to the industry: Legal About the service: Web3 and smart contracts

// next

Not quite your project?

Tell us what you have in mind. We will come back to you with a range and the questions that would narrow it. Or book a call and talk it through.

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