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Shelldan Technology
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© 2026 Shelldan Technology

Blockchain & Web3•Security review before launch•Free consultation

Secure records and smart contracts

We design smart contracts and decentralised applications for payments, ownership and shared records. Security reviews and a clear user flow come before anything goes live.

Smart contracts Wallets & dApps Certificates Shared records Loyalty tokens Security reviews
Start your project
In plain words
Do you need a blockchain?
ledger.yourbusiness.com
Shared record Every copy matches
#1041
Payment released
0x9f3a…c21e
#1042
Certificate issued
0x4be1…07d9
#1043
Batch received
0xa07c…5f12
#1044
Points redeemed
0x61d8…e3b4
Your office: ✓ same
Supplier: ✓ same
Auditor: ✓ same
Reviewed before launch
Tested on a test network first
Hard to alter
Every change leaves a trace
Smart contracts Escrow payments Digital certificates Shared records Wallet connections Loyalty tokens Security reviews Ethereum, Polygon, BNB Chain Solidity & Hardhat IPFS storage Smart contracts Escrow payments Digital certificates Shared records Wallet connections Loyalty tokens Security reviews Ethereum, Polygon, BNB Chain Solidity & Hardhat IPFS storage
Shared
One record, many parties
that everyone can check
Reviewed
Before anything goes live
tests and a security review
Testnet
Before real money
tried on a test network first
9–6
Support, every day
monitoring after launch
What we build

Payments, ownership and shared records.

Practical uses of blockchain for businesses, built with a user flow that does not assume anyone knows crypto.

Smart contracts

Agreements that carry themselves out

Self-executing code that holds a payment, checks a condition and releases it, so neither side has to trust a middleman with the money.

  • Escrow, payments and refunds
  • Rules written in code, visible to both sides
  • Built on OpenZeppelin libraries
  • Upgradeable where it needs to be
Smart contract
// Escrow.sol (simplified)
function deposit() payable
function confirmDelivery()
require(msg.sender == courier);
seller.transfer(amount);
function refund()
require(block.timestamp > deadline);
Order #A-1182
Buyer deposits ₹25,000
Seller ships the order
Delivery confirmed
Payment released to seller
No middleman holds the money
Illustration with sample data
Wallets & dApps

Blockchain apps people can actually use

Decentralised apps with a clear user flow: plain-language confirmations, sensible defaults, and no wallet jargon where it is not needed.

  • MetaMask, WalletConnect and hardware wallets
  • Biometric sign-in on phones
  • Readable confirmations before signing
  • Fees shown in plain numbers
Confirm payment
You are paying
₹25,000
into escrow for Order #A-1182
Released only when delivery is confirmed
Refunded if not delivered in 7 days
Network fee: about ₹4
Confirm with fingerprint
Illustration with sample data
Digital ownership

Certificates anyone can verify

Certificates, warranties, tickets and titles issued as digital tokens, so anyone can check who issued them and that they have not been changed.

  • ERC-721 and ERC-1155 tokens
  • Verification page anyone can open
  • Files stored on IPFS
  • Royalties and transfer rules if needed
verify.yourbusiness.com
Certificate of Completion
awarded to
Ananya Sharma
Food Safety Level 2 · Oct 2026
ID 0x7c2…91af
Verify
Issued by: City Training Institute
Issued on: 14 Oct 2026
Not changed since issue
Authentic
Illustration with sample data
Shared records

A history every partner can trust

When several businesses touch the same product or booking, each one records its own step in a shared record that no single party can quietly change.

  • Supply chain and batch tracing
  • Each entry signed by whoever made it
  • A QR code customers can scan
  • Private details kept off the chain
trace.yourbusiness.com
Where did this pack come from?Scan result
CollectedVillage centre, 6:10 amFAT 4.5%
ProcessedDairy plant, 9:40 amBatch B-2291
DispatchedCold chain, 2–4 °CVan RJ-07
On the shelfStation Road storeBest before 3 Nov
Each step recorded by the party who did it
Illustration with sample data
Tokens & loyalty

Points that work across partners

Loyalty points or tokens shared between several businesses, with one balance everyone sees and rules that run by themselves.

  • ERC-20 tokens with your rules
  • Earn and redeem across partners
  • Vesting and lock-up schedules
  • Admin controls kept by you
City Rewards
1,040 points
Usable at 6 partner shops
Earned at Cafe King+200
Earned at Lake View Hotel+120
Redeemed at Station Rd store−80
Every shop sees the same balance
Illustration with sample data
Security reviews

Reviewed before anything goes live

Code on a blockchain is hard to change once it is live, so every contract is tested and reviewed first, and tried on a test network before real money.

  • Automated tests for every rule
  • Review against common attacks
  • Gas optimisation
  • Testnet before mainnet
Security review
Security review (sample)Escrow.sol
Re-entrancy guard on withdrawals
Only admins can pause the contract
Refund deadline could be skipped
Fixed and re-tested
42 automated tests passing
Cleared for testnet, then mainnet
Illustration with sample data
Understanding blockchain

What is blockchain good for?

Three things worth knowing before you start, in plain words.

Shared between parties

One record that no single party controls

Blockchain and Web3 development is the work of building applications whose records are shared, checked and very hard to alter after the fact. It is most useful when several organisations need to rely on the same record.

  • Several businesses, one version of events
  • No middleman needed to hold the record
  • Each party can check it independently
How it works
Hotel
Travel agent
Payment partner
↘↓↙
One shared booking record
No one party owns or can quietly edit it
How a blockchain project runs

From the use case to a contract you can trust in 5 stages

Scroll down and follow one project, from the first questions to a reviewed contract running on mainnet.

1
Step 1 · Use case

Requirement analysis

We understand your use case and your users, and check whether a blockchain is really the right tool before anything is designed.

  • Who shares the record, and why
  • What must happen automatically
Discovery
Four questions before any code
Who needs to share this record?
→ Hotel, agents, payment partner
Does anyone need to trust it without us?
→ Yes, the agents
What must happen automatically?
→ Refund after cancellation
Do users already have crypto wallets?
→ No, keep it hidden
2
Step 2 · Design

Architecture design

We design the contract logic, decide what goes on the chain and what stays off it, and choose the network that fits your costs.

  • On-chain vs. off-chain data
  • Ethereum, Polygon or BNB Chain
Architecture
On the blockchain
Booking ID and amount
Refund rules
Who confirmed what, and when
In a normal database
Guest names and phone numbers
Photos and documents
Anything that may need deleting
Network: PolygonLow fees, Ethereum-compatible
3
Step 3 · Build

Smart contract development

We write the smart contracts and the app around them, with a user flow that does not assume people know crypto.

  • Solidity, Hardhat, OpenZeppelin
  • React and React Native front ends
Smart contract
// Escrow.sol (simplified)
function deposit() payable
function confirmDelivery()
require(msg.sender == courier);
seller.transfer(amount);
function refund()
require(block.timestamp > deadline);
Order #A-1182
Buyer deposits ₹25,000
Seller ships the order
Delivery confirmed
Payment released to seller
No middleman holds the money
4
Step 4 · Testing

Testing & security review

Every rule gets an automated test, and the contracts are reviewed against common attacks before any real money is involved.

  • Automated tests for every rule
  • Issues fixed and re-tested
Tests
$ npx hardhat test
✓ deposit() stores the amount
✓ only courier can confirm
✓ refund after deadline
✓ no refund before deadline
✓ pause blocks new deposits
✓ gas under budget
6 passing (sample)
5
Step 5 · Live

Deployment & maintenance

We deploy to a test network first, then to mainnet with verified source code, and keep watching it afterwards.

  • Testnet, then mainnet
  • Monitoring and planned upgrades
Deployment
Going live, step by step
Local tests
Hardhat
Testnet
Real network, test money
Mainnet
Live, verified source
After launch
Alerts on failed or unusual transactions
Admin pause switch kept by you
Upgrades through a planned process
Our blockchain services

What we can build for you

From a single contract to a full decentralised app. Open one to see what it covers.

Solidity

Smart contract development

Secure contracts for payments, escrow, tokens and governance, built on audited libraries.

ERC-20

Tokens & loyalty points

Tokens with your own rules for loyalty, rewards or access, shared across partners.

Wallets

Wallets & wallet connections

Secure, easy wallets and wallet connections for web and mobile apps.

Portfolio

DeFi dashboards

Dashboards that track holdings, yields and positions across chains in one place.

ERC-721/1155

NFTs & digital ownership

Certificates, tickets, warranties and collectibles issued as verifiable tokens.

Governance

Web3 content & DAO tools

Content and access controlled by a community or a group of partners, with storage that stays online.

Why it matters

Trust built into the record

Fewer middlemen

Payments and agreements settle by rules, cutting fees and waiting time.

Trust through transparency

Every party can check the same record for themselves.

Real digital ownership

Certificates and assets that the holder truly owns and can prove.

Hard to alter

History cannot be quietly rewritten, which helps in audits and disputes.

Rules that run themselves

Refunds, releases and rewards happen automatically when conditions are met.

Shared across partners

Several businesses can work from one record without one of them owning it.

Technologies we use

Ethereum, Polygon and BNB Chain

Well-established tools and audited libraries, so your contracts stand on code that many others have already tested.

Solidity
Smart contract language
Hardhat
Testing and deployment
OpenZeppelin
Audited contract libraries
Ethers.js & Web3.js
Talking to the blockchain
WalletConnect & Web3Modal
Wallet connections
IPFS, Pinata & Arweave
Decentralised file storage
Infura & Alchemy
Reliable blockchain access
React, Next.js, React Native
Web and mobile front ends
A written plan before any work starts

Where would you like to start?

Try the idea on a test network, add blockchain to an app you have, or just talk it through.

Lowest risk
Proof of concept

Try it on a test network

See the idea working before real money is involved.

  • Use case and design agreed in writing
  • Smart contract with automated tests
  • A simple app to try the flow
  • Running on a public testnet
  • A clear go / no-go decision
Start your blockchain project
Existing app

Add blockchain to your app

For a website or app that already has users.

  • Wallet connections or hidden wallets
  • Payments, certificates or loyalty
  • Personal data kept off the chain
  • Security review before mainnet
  • Monitoring after launch
Plan an integration
Not sure yet?
Let's talk

A consultation, at no charge.

  • Describe the problem in your own words
  • Hear whether blockchain fits
  • Or whether a database is enough
  • No obligation to go ahead
Schedule a consultation
Got questions?

Questions we hear a lot

Only if several parties need to rely on the same record without trusting one of them to keep it. If your own company owns all the data, a normal database is usually faster and cheaper, and we will say so.

Have a record several parties need to trust?

Tell us what you want to build. We will reply with a practical plan, a realistic timeline, and a price you can understand.

Start your blockchain projectSchedule a consultation