{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900130103",
    "entityType": "Track",
    "nonce": "0x341862fd47ac5ea76371d531b4d7fcf114bb364f63525aa9a3eb14c5c2dda05e",
    "signature": "0xaa0acf502651a08a8fd2fae6c5f8520bcc14081518e452f047189df401e989c4740c82e95a9d41d7debd91b67a43947e93a119ce2e257421a7f8c9d99a3e88b11c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}