{
  "manageEntity": {
    "action": "Save",
    "entityId": "759390",
    "entityType": "Track",
    "nonce": "0x7b0c14f4a2313dc35a441621c445dc9d0399dd754da135f8efc701ed9613f7ff",
    "signature": "0x951d9a4a07f9a4a5ba2e83e72891757a72b6a2dfbc93460578216a999a79a61502ec905aabd239fd11c90e74472198b28473a2cbc9cd392be192218b5b3c71c01b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}