{
  "manageEntity": {
    "action": "Save",
    "entityId": "121055483",
    "entityType": "Track",
    "nonce": "0x57c96267bd7e5238b977fd5753b860e40b15b2a6e6a75d55f6d806d078569e05",
    "signature": "0xf45c2e8d99486b2e236af1034f4837c3b7467fe69164606c6a12da1e90a590c731c8052bcd4e17043d9599f23e2ff2bee766c55b6eb432ab55289d207a374a1f1c",
    "signer": "0x3D472a01Cb831ac594835ac6038A4346E2A22B94",
    "userId": "327343"
  }
}