{
  "manageEntity": {
    "action": "Save",
    "entityId": "1781252059",
    "entityType": "Track",
    "nonce": "0x3c266405432146d4abc1e7ef2a8a237cc87898772b6e2cba86f6acf96a0fca8d",
    "signature": "0x7ba3a01671ff1b00c7ec9dae7863aa08a42761a01eb3c1418b37494b44f8a1fa724c41a09ad1e340682b240604abb91adb8d5e286731f01b743be7c17a63f9981c",
    "signer": "0x2b012Ef37cb9315271f0AC801DBbec07c0D4578d",
    "userId": "506789556"
  }
}