{
  "manageEntity": {
    "action": "Save",
    "entityId": "1123397579",
    "entityType": "Track",
    "nonce": "0xd356c48a9af6306b772be9dc4430b1d13409d302b4da7b526fcf27c6135a462d",
    "signature": "0xdca836af05ed200e4ee8f73e8a9783677e1404a4e4aa3561a7cb79d5ef4cd644335757acaa8ca3b61816d989ac8d31393779c756cd74b8195ec3a3bce8a5b05e1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}