{
  "manageEntity": {
    "action": "Save",
    "entityId": "583517",
    "entityType": "Track",
    "nonce": "0xaef41edd9d304d2edc9c5585ff85e50a399199577e63e775f126ddba15850f3e",
    "signature": "0xcdb4b82e21ee92c7ca6c17da8d14b2f56a41def5f623dbc16d39ebdc91b9cb64265a5d9644357c270c95257a51b0c710ed876d4050d7899316bf8b48423224271b",
    "signer": "0x4E3828bc809fb5B9deb81fa536cF73Dd5bF4eeB2",
    "userId": "185184169"
  }
}