{
  "manageEntity": {
    "action": "Save",
    "entityId": "1877812031",
    "entityType": "Track",
    "nonce": "0x6db0fa481fe10b5c6ff046480bab6672eccf1ed51b57c13c2073dc31efd3d5fc",
    "signature": "0xe68093708c3eff7486f48406bf0388cc284478ccde12228211da53f8eb22a204236af6a0b8548cd8baf74f4793cfba38c1f57ba2665ad7c299890e727e037d6b1c",
    "signer": "0x6B239e9B75f27b519de7Bad3a26a0b7d30e32D3f",
    "userId": "311257477"
  }
}