{
  "manageEntity": {
    "action": "Save",
    "entityId": "45912",
    "entityType": "Track",
    "nonce": "0x5f001d2c5acb2a42d097f382fd4bf5c9a0ce445f457fc12ad3b31828c5008a3d",
    "signature": "0x972f3d3e1802572ff8edca1b8c4af03c9633f65a1480d7a60c91087578ba82b2791e30de15fcc4d849329159fd32fc9c1006e5c04fde23fb570652fdc3858ffd1b",
    "signer": "0xf63b89A0Bbc03C7ec59aC257C7082A056082cDB8",
    "userId": "558452493"
  }
}