{
  "manageEntity": {
    "action": "Save",
    "entityId": "602133467",
    "entityType": "Track",
    "nonce": "0x3d057a1f00c1aabbc7ecf92841b61f1cd52336df67b36e776be5ce9e06d9bf21",
    "signature": "0x4969c14526f6385380b7e97622ec0e2ff0633cc895b14fc2d2aa171dd87459570238a855f2a89a93f580980918e3064c2b26903d53abab1fda5efa2bc2c58a0a1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}