{
  "manageEntity": {
    "action": "Save",
    "entityId": "1857387257",
    "entityType": "Track",
    "nonce": "0x0ce3e7855acf9190ed4736f1624fbd0212f0e504ae1c14215e8d3329dbbcbe45",
    "signature": "0x34e1eae90da5c0539002d65414126cc992e0be4dfa7bc5c635e0c846616e9c1c239720ac5014b4a0cbf4cf50a09bbdbd3baa68a26a7cb2d966d095e6f601512e1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}