{
  "manageEntity": {
    "action": "Save",
    "entityId": "337782369",
    "entityType": "Track",
    "nonce": "1785396138513672716",
    "signature": "0xf3e182b06376113acdc692950093a73662640ca2495786efda1e72ac2f935f836a02b6e0d777ee9a5c0a71d11c9fcfa3e4e07ff820da79780011787812e428771b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}