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

Rental credentials

A verifiable rental history that the renter holds.

A rental reference is a claim one company makes that another wants to check, about a person who should control it. That is the narrow case for verifiable credentials with a small public registry. Inside one landlord's buildings, a database is simpler, and we will say so.

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// what matters here

What is different in this industry.

01

The renter holds the record

The credential lives on the renter's phone. They decide which landlord sees it and what it shows, and can prove it without calling the old manager.

02

Nothing personal on chain

The public registry lists which managers can issue and which credentials were revoked. Names, addresses and payments never go on chain.

03

Fakes are easy to spot

A landlord checks the issuer's signature against the registry in seconds, so a made-up reference fails visibly.

04

Open standards

Credentials follow the W3C Verifiable Credentials standard, so other wallets and verifiers can read them, and you are not locked to us.

// 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

Portable rental history

Hypothetical. Not a client, not a result.

// The problem

Renters with a strong payment record cannot prove it to a new landlord without asking the old one, and landlords cannot easily tell a real reference from a made-up one.

// What we would build

Property managers issue a signed rental history credential to the resident's phone, and any landlord can verify it was issued by a registered manager and has not been revoked, using a small registry contract on a public chain. If only one landlord's buildings are involved, a database does the same job more cheaply.

// What is in it

Credentials issued by participating property managers, held by the resident
The resident chooses what to share and with whom
A registry contract listing issuers and revocations, with no personal data on chain
A verification page any landlord can use
A contract audited before it is deployed

// Stack

W3C Verifiable Credentials
Solidity
Ethereum layer 2
Next.js
DigitalOcean

// estimate

Build: ≈ US$68,100 to US$104,000, delivered within 20 weeksCAD 97,000 to 148,300
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 property system vendor: 1 to 4 weeks

How it is paid

Deposit 20%: CAD 19,400 to 29,660
Discovery 4.2%: CAD 4,074.00 to 6,228.60
Specification 5.3%: CAD 5,141.00 to 7,859.90
Design approved 4.2%: CAD 4,074.00 to 6,228.60
Core features 12.6%: CAD 12,222.00 to 18,685.80
Full build 8.4%: CAD 8,148.00 to 12,457.20
Contracts and tests 16%: CAD 15,520 to 23,728
Testing and fixes 4.2%: CAD 4,074.00 to 6,228.60
Testnet deployment 5.3%: CAD 5,141.00 to 7,859.90
Launch 4.2%: CAD 4,074.00 to 6,228.60
Mainnet 5.6%: CAD 5,432.00 to 8,304.80
Holdback, 30 days after launch (10%): CAD 9,700 to 14,830

Start from this example

// questions

Questions we get about this.

Do renters need a crypto wallet?

No. The credential sits in an app on their phone. There are no tokens, no fees for the renter and nothing to buy.

What if a credential was issued by mistake?

The issuing manager revokes it in the portal, the revocation is recorded in the registry, and any later check shows it as revoked.

How many managers must join to make it useful?

Enough that renters move between them, which in practice means a group of managers or an association in one market. For a single landlord, a database does the job.

Back to the industry: Real estate and proptech 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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