{
  "manageEntity": {
    "action": "Save",
    "entityId": "401747479",
    "entityType": "Track",
    "nonce": "0xa786da74b34b9892329a48175ec1f3d39d35506d4dfa46137e113c441b1e57d7",
    "signature": "0xd69125bfeed61b7ed8e8eefa37e6aab931169d2171a1f1c75cf59f7338fd26ea05c3129f657d5730336c260bec3f9a670a259e54638c2f387af7945ae73c81171c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}