Please describe your proposed solution.

XP.Network bridge can open the markets of the NFT ecosystems of all the connected chains to Cardano and vice versa.

dApps will be able to build cross-chain games, Metaverses, marketplaces, defi solutions involving NFTs as collateral or as keys to services or information.

ADA will be used for buying and selling NFTs from other chains, while their native coins will be paid to buy Cardano native NFTs.

Please describe how your proposed solution will address the Challenge that you have submitted it in.

XP.Network bridge enables relaying transactions from one chain to another making NFT transfers between blockchain similar to those inside one chain.

What are the main risks that could prevent you from delivering the project successfully and please explain how you will mitigate each risk?

The major risk is lack of information: NFT related projects may be unaware that such a bridge exists and they can use it 24/7.

We keep participating in Crypto conferences, publishing blogs and media announcements, conducting and taking part in AMAs, publishing on the industry acknowledged platforms and in the communities of the blockchains and NFT projects. We speak directly with the dApps, Marketplaces and games, sometimes together with the blockchain teams of the interested chains to spread the word about the existing opportunities.

Please provide a detailed plan, including timeline and key milestones for delivering your proposal.

Development Roadmap of Cardano Integration

## Milestone 1 — Smart Contract Development

| Length | Deliverable | Specification |

|-|-|-|

| 1.5 month | Smart Contracts | We will develop smart contracts that will:<br/>0. Research about Cardano standards and other factors & protocols that distinguish it from other chains<br/>1. Support Singe & Batch transfers<br/>2. Freeze/Unfreeze Native NFTs<br/>3. Mint/Burn wrapped NFTs<br/>4. Withdraw the TX fees on the target chain in native tokens|

## Milestone 2 — Smart Contract Development

| Length | Deliverable | Specification |

|-|-|-|

| 1.5 month | Smart Contracts | We will develop smart contracts that will:<br>5. Trust the multisig of the bridge oracle validators<br/>6. Whitelist NFT smart contracts<br/>7. Pause/Unpause for maintenance or if compromised<br/>8. Reimburse the bridge validators their expenses|

## Milestone 3 — Testing & Documenting

| Length | Deliverable | Specification |

|-|-|-|

| 2 weeks | Tests & Documentation | 1. We will provide both inline documentation of the code and a basic tutorial that can interact with the deployed smart contracts and backend service.<br/>2. The code will have proper unit-test coverage 85% to ensure functionality and robustness. In the guide, we will describe how to run these tests preparing for auditing<br/>3. Deploying and testing the contracts in the testnet environment|

## Milestone 4 — Integrating into the Live Bridge

| Length | Deliverable | Specification |

|-|-|-|

| 1 month | Validators, Backend, Frontend | 1. Developing validation logic relevant for the Cardano part of the bridge<br/>2. Adding Cardano to the Bridge NFT-Indexer<br/>3. Integrating TX fee estimation<br/>4. Plugging Cardano in the heartbeat<br/>5. Integrating with a Cardano rpc node<br/>6. Integrating Cardano in the bridge UI<br/>7. Deploying smart contracts<br/>8. Adding Cardano to the bridge JS library<br/>9. Adding access to Cardano from the REST API<br/>10. Adding Cardano to the bridge widget|

Please provide a detailed budget breakdown.

|Milestone| Length | Breakdown|

|:-:|:-:|:-:|

|1 |1.5 |$33,333|

|2 |1.5 |$33,333|

|3 |0.5 |$11,111|

|4 |1 |$22,222|

|Total |4.5 |$100,000|

Please provide details of the people who will work on the project.

• XP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network TeamXP Network Team[XP Network Team](https://xp.network/team/)
• [Dima Briukhanov](https://github.com/dima-brook) CTO
• [Rupansh Sekar](https://github.com/rupansh) Blockchain Developer
• [Sumit Kumar](https://github.com/imsk17) Blockchain Developer
• [Xueming Zheng](https://github.com/rocalex) Blockchain Developer
• [Yura Dukhno](https://github.com/YuraDQuigon) Front-End Developer
• [Alexey Adoniev](https://github.com/AlexeyAdoniev) FullStack Developer

If you are funded, will you return to Catalyst in a later round for further funding? Please explain why / why not.

We're planning to get a grant to cover the costs of development.

The community will benefit from using the bridge with low rates, including the members with low income and living standards.

The fees are minimal, so to earn and return the grant amount will take us tens or hundreds of years.

Please describe what you will measure to track your project's progress, and how will you measure these?

We will add functional tests that will cover at least 85% of the on-chain code functionality.

Some code will server the project setting purposes.

What does success for this project look like?

Successful NFT transfers to Cardano from the other bridged chains and back using the UI/widget and the JavaScript library of the bridge.

Please provide information on whether this proposal is a continuation of a previously funded project in Catalyst or an entirely new one.

This is a brand new proposal not connected to any previous one.