Induji Technical Team
Content Strategy
The Open Network for Digital Commerce (ONDC) is poised to revolutionize India's digital economy by unbundling e-commerce. It creates a level playing field where any seller can connect with any buyer through a network of interoperable applications. While this democratization is powerful, it introduces a complex, multi-stakeholder environment where the flow of data—especially marketing attribution data—becomes a critical point of failure or success.
In the traditional, centralized model, a single platform like Amazon or Flipkart controls the entire user journey and its associated data. In ONDC, the journey is fragmented across multiple, independent Network Participants (NPs):
Now, consider a performance marketing campaign. The Buyer App runs a promotion. The Seller App pays a commission for every sale generated. How can the Seller App be 100% certain that the conversion data reported by the Buyer App is accurate and not inflated? How can the Buyer App prove its contribution in a multi-touch journey? This is the fundamental attribution challenge, and it's where traditional models break down, leading to disputes, revenue leakage, and a lack of trust that can stifle the network's growth.
This is where a protocol-level blockchain solution becomes not just an innovation, but a necessity. We propose a technical blueprint for a Blockchain Attribution & Settlement Layer (BASL), a shared, immutable ledger designed to bring radical transparency and automated execution to ONDC's marketing ecosystem by 2026.
The BASL is not another application; it's a foundational infrastructure layer that ONDC participants can plug into. Its design is based on four core principles:
The system comprises on-chain and off-chain components working in concert.
AttributionLogger contract to record events and the SettlementEngine contract to execute payments.Constructing this protocol requires careful architectural decisions, from the choice of blockchain to the specific logic within the smart contracts.
The choice of blockchain is a trade-off between decentralization, performance, and cost.
For a network as public and diverse as ONDC, an Ethereum L2 Rollup presents the most balanced and future-proof choice.
The logic of the BASL is encoded in Solidity (for EVM-compatible chains). We need at least two primary contracts.
AttributionLogger ContractThis contract's sole purpose is to create an immutable log of marketing touchpoints.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
contract AttributionLogger {
// Event to be emitted for off-chain indexing and analytics
event EventLogged(
bytes32 indexed eventId,
uint256 timestamp,
bytes32 indexed userHash,
bytes32 indexed campaignId,
address indexed networkParticipant,
EventType eventType
);
enum EventType { IMPRESSION, CLICK, ADD_TO_CART, PURCHASE_INITIATED }
struct AttributionEvent {
uint256 timestamp;
bytes32 userHash; // Keccak256 hash of a unique user identifier
bytes32 campaignId;
address networkParticipant; // The address of the NP logging the event
EventType eventType;
}
// Mapping to store the events
mapping(bytes32 => AttributionEvent) public events;
// Only authorized NP addresses can log events
mapping(address => bool) public isAuthorizedParticipant;
address public owner;
modifier onlyAuthorized() {
require(isAuthorizedParticipant[msg.sender], "Not an authorized participant");
_;
}
constructor() {
owner = msg.sender;
}
function addParticipant(address _participant) external {
require(msg.sender == owner, "Only owner can add participants");
isAuthorizedParticipant[_participant] = true;
}
// Function called by NPs to log a new event
function logEvent(
bytes32 _userHash,
bytes32 _campaignId,
EventType _eventType
) external onlyAuthorized {
bytes32 eventId = keccak256(abi.encodePacked(block.timestamp, _userHash, _campaignId, msg.sender));
events[eventId] = AttributionEvent({
timestamp: block.timestamp,
userHash: _userHash,
campaignId: _campaignId,
networkParticipant: msg.sender,
eventType: _eventType
});
emit EventLogged(eventId, block.timestamp, _userHash, _campaignId, msg.sender, _eventType);
}
}
Key points in this contract:
userHash: We never store raw user data on-chain. A unique but anonymized identifier is hashed off-chain and the hash is stored, ensuring DPDP Act compliance.onlyAuthorized modifier: Access control is critical. Only registered and verified NP wallet addresses can write data to the contract.EventLogged): Emitting events is a cheap way to make data available for off-chain services to listen to and build analytics dashboards without constantly querying the contract's state.SettlementEngine ContractThis contract holds the funds and the business logic for payouts. It would be called by an authorized party (or an Oracle) upon final confirmation of an order.
// Simplified example of a settlement contract
interface IAttributionLogger {
function events(bytes32 eventId) external view returns (/* ... */);
}
contract SettlementEngine {
// ... (owner, authorized parties)
// Maps a campaign ID to its attribution model and commission rate
struct CampaignRules {
address payable seller;
address payable buyerApp; // The affiliate/promoter
uint8 commissionBPS; // Commission in basis points (e.g., 500 = 5%)
// Potentially an enum for attribution model (e.g., LastClick, Linear)
}
mapping(bytes32 => CampaignRules) public campaignRules;
// Called by an oracle upon confirmed delivery
function triggerSettlement(bytes32 _purchaseEventId, bytes32[] calldata _touchpointEventIds) external {
// 1. Authenticate the caller (must be a trusted oracle)
// 2. Look up the purchase event in the AttributionLogger contract
// IAttributionLogger logger = IAttributionLogger(loggerAddress);
// AttributionLogger.AttributionEvent memory purchaseEvent = logger.events(_purchaseEventId);
// 3. Verify the touchpoint events and apply the attribution logic
// (e.g., find the last click before purchase)
// 4. Calculate the commission based on campaignRules
// uint256 commissionAmount = (purchaseValue * rules.commissionBPS) / 10000;
// 5. Transfer funds (e.g., using a stablecoin like USDC)
// IERC20(usdcAddress).transferFrom(rules.seller, rules.buyerApp, commissionAmount);
}
}
A smart contract is blind to the outside world. It cannot natively call an API to check a delivery status. This is where oracles become the most critical piece of the infrastructure.
triggerSettlement function on the SettlementEngine smart contract, passing the relevant event IDs. The smart contract then executes the pre-defined payment logic trustlessly.Deploying a protocol of this magnitude requires a careful, phased approach.
Phase 1 (Q1-Q2 2025): Protocol Design & Testnet PoC
Phase 2 (Q3-Q4 2025): Pilot Program & Oracle Integration
Phase 3 (Q1-Q2 2026): Scalability Hardening & Security Audits
Phase 4 (Q3 2026): Mainnet Launch & Decentralized Governance
Q1: Isn't blockchain too slow and expensive for high-volume ad events like impressions? This is a valid concern with Layer 1 blockchains like Ethereum mainnet. However, by using Layer 2 Rollups, we can batch thousands of transactions into a single L1 settlement, bringing the cost per event down to fractions of a paisa. Furthermore, for low-value events like impressions, we can use off-chain data availability layers and only post Merkle Roots on-chain, making it economically viable.
Q2: How do you handle attribution model changes once the smart contract is deployed? Smart contracts are immutable, but their architecture can be upgradeable. We would use a proxy pattern (like the UUPS or Transparent Upgradeable Proxy standard) where the logic contract can be swapped out for a new version following a successful governance vote. This allows the protocol to evolve without losing the state or address of the main contract.
Q3: How does this system comply with India's Digital Personal Data Protection (DPDP) Act? Privacy is paramount. The protocol is designed to never store PII on the blockchain. All user-specific data (like a user ID or phone number) is hashed off-chain by the Network Participant's system before being sent to the protocol. The on-chain data is pseudonymous, linking events through these hashes without revealing the actual identity of the user, thus complying with data minimization and purpose limitation principles.
Q4: Does this replace existing analytics tools like Google Analytics or Mixpanel? No, it complements them. The BASL is not a user-facing analytics dashboard. It is a foundational settlement and verification layer. NPs will still use their internal analytics tools for deep user behavior analysis. The BASL's role is to be the undisputed financial source of truth when it comes time to settle commissions and marketing fees between organizations.
The transition to a decentralized digital marketplace requires a new paradigm of trust and verification. A Blockchain-Based Attribution & Settlement Layer is the cornerstone of that future, ensuring that all participants in the ONDC network can transact and collaborate with confidence.
Building such a robust, secure, and scalable protocol requires deep expertise in distributed systems, smart contract development, and enterprise-grade DevOps. The team at Induji Technologies has the experience and vision to architect and implement these next-generation solutions.
Request a Quote Today to discuss how we can help you design and build the foundational protocols that will power your ONDC strategy for 2026 and beyond.
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