{
  "manageEntity": {
    "action": "Save",
    "entityId": "555788888",
    "entityType": "Track",
    "nonce": "0xec3c698fc52c7026b6cc2565a1bee0aef617ecce8db4e7844a99a24467f95075",
    "signature": "0x2a9cedda8895e8b17a607e10b13d93a461a8d523915a4ed69f23869f6dc374223bb8f9e95de23e29b6bc125b2b7b2e4c451e29b9fd3df6bc7b50e2a960ef64df1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}