{
  "manageEntity": {
    "action": "Save",
    "entityId": "900512468",
    "entityType": "Track",
    "nonce": "0x3c284c1baa0222880804f2c4a9ab17359eed0f35fc4b45f4c68d9e89ab7ae3ca",
    "signature": "0x2a1c7b094f0e2ef487fcbc8da710dbbf3c9bf7cd2d6c5f96823072442fa7e9ce6258292469a4c96f11af82343d7ee7e15b901807555e839f0cd7b464ab3bf8661c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}