Add gentx and account for Data Nexus

[datanexus-vincent]

Validator Information

Moniker: Data Nexus

Checklist

• I have backed up my validator keys securely
• I have stored my mnemonic phrase safely
• I have verified new genesis file is valid (I ran lumerad genesis validate)
• I have verified my gentx file is valid
• I will be available during the network launch

[github-actions]

🚫 PR Validation Failed

❌ ERROR: PRs must not modify mainnet/genesis.json

The genesis file should only be updated by maintainers after collecting all gentx files.

How the process works:

• Your genesis account will be automatically created from the public key in your gentx file
• Maintainers will collect all gentx files and generate the final genesis.json
• No manual genesis.json modifications are needed from contributors

Required changes:

• Remove mainnet/genesis.json from this PR
• Only include your gentx file in mainnet/gentx/

---

This PR is blocked from merging until these issues are resolved.
Validation failed at 2025-06-01T01:53:15.609Z

[a-ok123]

🔍 Gentx Validation Results
✅ Status: PASSED

All gentx files have been successfully validated! 🎉

Validation run at Sun Jun 1 21:27:19 UTC 2025