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❓ Frequently Asked Questions - ucash.eth {#faq-top}

Last Updated: 2026-04-28

Table of Contents

General Questions

Q: What is ucash.eth?

A: ucash.eth is the official ENS (Ethereum Name Service) identity for UCASH, providing:

  • Human-readable names instead of 0x addresses
  • 300+ subdomains for decentralized services
  • Multi-chain presence across 15+ networks
  • Cryptographically verifiable on-chain records
  • Simplified payments to ucash.eth instead of addresses

Q: What is UCASH?

A: UCASH is a network loyalty, rewards, and utility asset that has been building Web3 infrastructure since 2015. Key stats:

  • 650,000+ users onboarded globally
  • 300,000+ on-chain holders across multiple networks
  • 1,200+ active sites across various industries
  • 20+ apps, dApps and services live and deployed
  • 4,000,000+ platform interactions across all services
  • 2,500,000+ bounty engagements through IBO and OBO programs
  • 10+ years active (2015-2026)

Q: How many subdomains does ucash.eth have?

A: 300+ subdomains currently in development (as of 2026-04-28). All subdomains are manager-controlled and verified. See SUBDOMAINS.md for the complete list.

Q: What is the current status of UCASH subdomains?

A: All 300+ subdomains are currently 🟡 In Development. This means they are registered and configured but not yet fully deployed. Check app.ens.domains/ucash.eth for the latest status.

Q: How long has UCASH been active?

A: UCASH has been active since October 2015 (10+ years). The ecosystem has evolved through multiple phases:

  • 2015-2017: Initial infrastructure (U.CASH site, portal, converters)
  • 2017-2019: Token launch and core products (IBO, uWithdraw, uExchange)
  • 2019-2021: Multi-chain expansion and global launch
  • 2021-2023: Ecosystem growth (payments, DNS, AI)
  • 2024-2026: Web3 naming and domains (ENS, .U, @U, ucash.eth)

See the full timeline in README.md.

ENS & Subdomains

Q: How do I verify a ucash.eth subdomain?

A: There are three ways to verify a subdomain:

Method 1: Check This Repository

Method 2: ENS Lookup

# Using nslookup
nslookup app.ucash.eth

# Or using dig
dig app.ucash.eth

# Or using ethers.js
const address = await provider.resolveName('app.ucash.eth');

Method 3: ENS Manager

Visit: https://app.ens.domains/app.ucash.eth

⚠️ Warning: Only subdomains listed in this repository are official UCASH subdomains.

Q: What is ucash.onl?

A: ucash.onl is a wildcard IPFS gateway resolution service for the UCASH ENS ecosystem. It maps *.ucash.eth subnames to *.ucash.onl URLs for easier browser access.

Examples:

  • www.ucash.eth → https://www.ucash.onl
  • docs.ucash.eth → https://docs.ucash.onl
  • app.ucash.eth → https://app.ucash.onl

Benefits:

  • ✅ Works in all browsers without Web3 extensions
  • ✅ Faster resolution (direct gateway access)
  • ✅ Easy to share with non-crypto users
  • ✅ CDN integration for optimized delivery

Q: Can I register a ucash.eth subdomain?

A: No, ucash.eth subdomains are not available for public registration. All 300+ subdomains are manager-controlled and owned by the ucash.eth owner for official UCASH services.

Public alternatives:

Q: How do I send tokens to ucash.eth?

A: Sending to ucash.eth is easy with any ENS-compatible wallet:

Using MetaMask:

  1. Open MetaMask
  2. Click "Send"
  3. Enter ucash.eth in the recipient field
  4. MetaMask auto-resolves to the correct address
  5. Enter amount and confirm

Using Coinbase Wallet:

  1. Open Coinbase Wallet
  2. Tap "Send"
  3. Enter ucash.eth
  4. Wallet resolves automatically
  5. Confirm transaction

Using ethers.js:

await token.transfer('ucash.eth', amount);

Always verify the resolved address matches: 0x1CE1E8d2dc83A3051adA2974D9A6c0AD1E5F4E0F

Q: What are the text records for ucash.eth?

A: ucash.eth has 55+ text records configured, including:

  • email: info@u.cash
  • url: https://u.cash
  • com.twitter: UdotCASH
  • com.github: UdotCASH
  • org.telegram: ucash
  • description: Full project description
  • avatar: https://euc.li/ucash.eth
  • Social media links (YouTube, Instagram, Facebook, Reddit, LinkedIn)
  • Explorers (Etherscan, Polygonscan, Basescan)
  • Multi-chain names (Base, Linea, Arbitrum, BNB, Solana, etc.)

View all records in README.md or on app.ens.domains.

Multi-Chain

Q: What multi-chain names does UCASH have?

A: UCASH has 15+ blockchain names across multiple networks:

Primary Names:

  • ucash.eth - Ethereum Name Service (300+ subdomains)
  • ucash.base.eth - Base Names
  • ucash.linea.eth - Linea Names
  • ucash.arb - SpaceID (Arbitrum)
  • ucash.bnb - SpaceID (BNB Chain)
  • ucash.g - SpaceID (Gravity Alpha)
  • ucash.sol - Solana Name Service
  • ucash.polygon - Unstoppable Domains
  • ucash.u - Ucosystem TLD (.U domain)
  • ucash.op - Optimism Domains
  • ucash.btc - Bitcoin Name Service
  • ucash.xrp - XRP Name Service
  • ucash.ltc - LTC Names
  • ucash.xmr - XMR Names

Additional Names:

  • ucash.dao.eth - Aragon DAO
  • sui@ucash - Sui Name Service
  • ada@ucash - Cardano Handle
  • lens@ucash - Lens Protocol
  • fio@ucash - FIO Protocol
  • ucash.ton - TON Name Service
  • ucash.tao - Bittensor Name Service
  • ucash.xns - X Name Service

See NETWORKS.md for complete details.

Q: What networks are supported?

A: UCASH supports 15+ networks:

EVM Chains:

  • Ethereum (Mainnet)
  • Base
  • Arbitrum
  • Optimism
  • Linea
  • BNB Chain
  • Polygon

Non-EVM Chains:

  • Solana
  • Bitcoin
  • XRP Ledger
  • Litecoin
  • Monero
  • Cardano
  • Sui
  • TON
  • Bittensor (TAO)
  • Bitcoin Cash (BCH)
  • Gravity Alpha

See NETWORKS.md for network-specific details.

Q: How do I resolve ucash.eth on different networks?

A: Resolution methods vary by network:

ENS (Ethereum):

const provider = new ethers.JsonRpcProvider('https://eth.llamarpc.com');
const address = await provider.resolveName('ucash.eth');

Base Names:

const baseProvider = new ethers.JsonRpcProvider('https://mainnet.base.org');
const ucashBase = await baseProvider.resolveName('ucash.base.eth');

Solana Name Service:

import { getSolanaName } from '@solana/sns';
const ucashSol = await getSolanaName('ucash.sol');

Unstoppable Domains:

const ucashUD = await resolve('ucash.u');

See INTEGRATION.md for more examples.

Q: What is the .U TLD?

A: .U is a public TLD operated by UCASH on Unstoppable Domains. Anyone can register their own .U domain.

Stats:

  • 🔐 22,000+ .U domains claimed
  • 💰 One-time fee (no renewals)
  • 🔗 Multi-chain address support
  • 🌐 Decentralized website hosting

Register at: get.unstoppabledomains.com/u/

Examples:

  • ucash.u - Official UCASH .U domain
  • yourname.u - Your personal .U domain
  • *.u - Any .U domain

Benefits:

  • Replace wallet addresses with yourname.u
  • Host decentralized websites
  • Receive crypto payments
  • No renewal fees (own forever)

Q: What is the @U handle?

A: @U is a public handle TLD operated by UCASH on FIO Protocol. It allows anyone to register their own @U handle.

Status: Public registration opening soon

Register at: fio.net

Benefits:

  • 📱 Cross-chain payments
  • 🔄 Interoperable with major wallets
  • 🛡️ Secure by design (transaction mapping + memo support)

Example: ucash@u

Security & Verification

Q: How do I know if a ucash.eth subdomain is official?

A: Follow these verification steps:

  1. Check this repository - All official subdomains are listed in SUBDOMAINS.md
  2. Verify on ENS app - Check app.ens.domains/ucash.eth?tab=subnames
  3. Cross-reference with ADDRESSES.md - Verify contract addresses
  4. Confirm in official channels - Verify via t.me/ucash

⚠️ Never trust subdomains from:

  • Unsolicited DMs
  • Unverified social media
  • Fake websites (ucash.eth.com, ucash.io, etc.)
  • Unknown sources

Q: What are common scams to watch out for?

A: 🚩 Common Scams:

Fake Websites:

  • ucash.eth.com
  • ucash.io
  • ucash-token.com
  • Any variation not ending in .eth

Impersonation:

  • Fake Discord/Telegram accounts
  • Fake social media profiles
  • Impersonators claiming to be UCASH team

Fake Airdrops:

  • "Claim your UCASH tokens now!"
  • "Verify your wallet to receive rewards"
  • "Send 1 ETH, get 2 ETH back"

Investment Scams:

  • Promises of unrealistic returns
  • "Guaranteed profits"
  • Urgency tactics ("act now!")

How to Protect Yourself:

  1. Only trust ucash.eth (the official ENS)
  2. Bookmark official sites from this repository
  3. Never share private keys
  4. Enable 2FA on all accounts
  5. Use hardware wallets for large amounts
  6. Verify every transaction before signing
  7. Start with test transactions (small amounts)

Q: How do I report a security issue?

A: If you discover a security vulnerability:

DO:

  • ✅ Report privately to security@u.cash
  • ✅ Include detailed description and proof of concept
  • ✅ Allow reasonable time to fix before public disclosure
  • ✅ Provide contact information for follow-up

DON'T:

  • ❌ Publicly disclose before fix is deployed
  • ❌ Exploit the vulnerability
  • ❌ Demand excessive bounty payments
  • ❌ Use the vulnerability to harm users

Bug Bounty Program:

  • Critical: $5,000 - $50,000
  • High: $1,000 - $5,000
  • Medium: $500 - $1,000
  • Low: $100 - $500

Submit: security@u.cash with PGP key if available

Q: What should I do if I've been scammed?

A: Immediate Actions:

  1. Stop - Don't send more tokens
  2. Document - Save all transaction hashes, messages, screenshots
  3. Report - Email abuse@u.cash with details
  4. Contact - Reach out to relevant exchange (if applicable)
  5. Secure - Change passwords, transfer remaining funds to new wallet

Recovery Options:

  • Contact your wallet provider
  • Report to relevant authorities
  • Join community support channels for guidance

Report Scams:

Q: How do I verify a UCASH contract address?

A: Follow these steps:

  1. Check this repository - All addresses are in ADDRESSES.md
  2. Verify on Etherscan - Check for "Contract Source Code Verified" badge
  3. Cross-reference - Confirm address matches official announcements
  4. Test transaction - Send small amount first

Contract Verification Checklist:

  • Source code verified on Etherscan
  • Contract address matches this repository
  • ENS record points to correct address
  • ABI is available for integration
  • Audit report is available (if applicable)
  • Official announcement exists

UCASH Token Contracts:

  • Ethereum: 0x92e52a1a235d9a103d970901066ce910aacefd37
  • Polygon: 0xa94880d3a4b39746e90cdb57f8de3732c984de14
  • Base: 0x26cf750abaf38af7109effdbdf79ba50d2ee09a1

Primary Address:

  • 0x1CE1E8d2dc83A3051adA2974D9A6c0AD1E5F4E0F (ucash.eth)

Integration & Development

Q: How do I integrate ucash.eth into my application?

A: See INTEGRATION.md for comprehensive integration examples.

Quick Start (JavaScript):

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://eth.llamarpc.com');

// Resolve ENS to address
const address = await provider.resolveName('ucash.eth');
console.log(address); // 0x1CE1E8d2dc83A3051adA2974D9A6c0AD1E5F4E0F

// Reverse lookup
const reverseName = await provider.lookupAddress(address);
console.log(reverseName); // ucash.eth

Frontend (React):

import { ethers } from 'ethers';
import { useState, useEffect } from 'react';

function UCASHAddress() {
    const [address, setAddress] = useState(null);

    useEffect(() => {
        async function resolveENS() {
            const provider = new ethers.JsonRpcProvider('https://eth.llamarpc.com');
            const resolvedAddress = await provider.resolveName('ucash.eth');
            setAddress(resolvedAddress);
        }
        resolveENS();
    }, []);

    return <div>{address}</div>;
}

Q: What wallets support ucash.eth?

A: ucash.eth is supported by all ENS-compatible wallets:

Desktop/Extension:

  • MetaMask
  • Coinbase Wallet
  • Brave Wallet
  • Trust Wallet
  • Rainbow
  • Argent

Mobile:

  • Coinbase Wallet
  • Trust Wallet
  • Rainbow
  • Argent

Hardware:

  • Ledger
  • Trezor

See WALLETS.md for comprehensive wallet compatibility across all networks.

Q: Can I use ucash.eth in smart contracts?

A: Yes! You can resolve ENS names in smart contracts:

Solidity Example:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IENS {
    function resolver(bytes32 node) external view returns (address);
}

interface IResolver {
    function addr(bytes32 node) external view returns (address);
}

contract UCASHIntegration {
    IENS public constant ENS = IENS(0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e);
    bytes32 public constant UCASH_NODE = 0x...; // namehash('ucash.eth')

    function getUCASHAddress() public view returns (address) {
        IResolver resolver = IResolver(ENS.resolver(UCASH_NODE));
        return resolver.addr(UCASH_NODE);
    }

    function sendToUCASH(uint256 amount) external {
        address ucashAddress = getUCASHAddress();
        payable(ucashAddress).transfer(amount);
    }
}

See INTEGRATION.md for more examples.

Q: How do I resolve subdomains programmatically?

A: Subdomains resolve the same way as the primary ENS:

// Resolve subdomains
const app = await provider.resolveName('app.ucash.eth');
const api = await provider.resolveName('api.ucash.eth');
const batch = await provider.resolveName('batch.ucash.eth');

// Resolve network-specific
const polygon = await provider.resolveName('polygon.ucash.eth');
const base = await provider.resolveName('base.ucash.eth');

// All resolve to verified addresses
console.log(app);      // 0x...
console.log(api);      // 0x...
console.log(batch);    // 0x...

See SUBDOMAINS.md for the complete list of subdomains.

Troubleshooting

Q: Why isn't ucash.eth resolving in my wallet?

A: Common solutions:

1. Check ENS Compatibility

  • Ensure your wallet supports ENS (MetaMask, Coinbase Wallet, etc.)
  • Update to the latest wallet version

2. Check Network

  • Ensure you're on Ethereum mainnet (not testnet)
  • Try switching networks and back

3. Clear Cache

  • Clear your wallet cache
  • Restart the wallet application

4. Use Etherscan

5. Alternative Method

  • Use the direct address: 0x1CE1E8d2dc83A3051adA2974D9A6c0AD1E5F4E0F
  • Verify on app.ens.domains

Still not working?

Q: I sent tokens to the wrong address. What do I do?

A: Unfortunately, cryptocurrency transactions are irreversible. Once sent, tokens cannot be recovered unless:

Recovery Options:

  1. Contact the recipient (if known)
  2. Contact the exchange (if sent to an exchange)
  3. Report to authorities (if fraud/scam)

Prevention for future:

  1. Always verify addresses - Use ENS names when possible
  2. Start with test transactions - Send small amounts first
  3. Use address books - Save verified addresses
  4. Enable confirmation prompts - Some wallets allow confirmation
  5. Double-check - Verify recipient before confirming

Report the incident:

Q: How do I know if a website is official?

A: Official UCASH Websites:

  • u.cash
  • u.onl
  • un4.com
  • ucosystem.com

Official ENS:

  • ucash.eth
  • ucash.u
  • app.ucash.eth
  • docs.ucash.eth

Official Social Media:

⚠️ Fake Websites (AVOID):

  • ucash.eth.com
  • ucash.io
  • ucash-token.com
  • Any site not listed above

Verification Steps:

  1. Check against this list
  2. Verify social media links
  3. Look for ENS verification
  4. Confirm in official channels

Q: Why are all subdomains "In Development"?

A: All 300+ subdomains are currently 🟡 In Development because:

  1. Infrastructure Deployment - Subdomains are being configured and deployed
  2. Service Integration - Connecting subdomains to backend services
  3. Testing - Ensuring security and functionality
  4. Phased Rollout - Gradual deployment across the ecosystem

What "In Development" means:

  • ✅ Subdomain is registered and configured
  • ✅ ENS records are set
  • ⏳ Service backend is being deployed
  • ⏳ Testing and security audits in progress

When will they be live?

  • Follow official announcements on t.me/ucash
  • Check app.ens.domains/ucash.eth for updates
  • Monitor GitHub repository for changes

Current Status:

  • All subdomains are operational for resolution
  • Services are being deployed incrementally
  • Security audits are ongoing

Still Have Questions?

Documentation Resources

Official Channels

Contact:

Community:

Websites:

Get Help

  1. Search the documentation - Check all .md files for answers
  2. Join the community - Ask in t.me/ucash
  3. Open a GitHub issue - github.com/UdotCASH/ucash.eth/issues
  4. Contact support - Email info@u.cash

Reporting Issues

Bug Reports:

  • Open a GitHub issue with detailed information
  • Include steps to reproduce
  • Provide screenshots if applicable

Security Issues:

  • Email security@u.cash (private disclosure)
  • Do NOT post publicly
  • Include proof of concept

Abuse/Scams:

  • Email abuse@u.cash
  • Include evidence (screenshots, transaction hashes)
  • Provide context and details

🎯 Quick Navigation

📘 Documentation:

🔗 External Links:

↑ Back to top

Last Updated: 2026-04-28 Repository: github.com/UdotCASH/ucash.eth