{
  "manageEntity": {
    "action": "Save",
    "entityId": "687533748",
    "entityType": "Track",
    "nonce": "0x29eb320816b79627e572aadb248938ef4a92e454f4434a16ec3374eb709272dc",
    "signature": "0x59007384e73ade9756d8b5c3c48435b48cb796ec12858b6e859feea1d906e15530e1c25e62944e5a04a82a150f28a9dd33691b2fc56256ff055d801d80f308ae1c",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}