{
  "manageEntity": {
    "action": "Save",
    "entityId": "502576",
    "entityType": "Track",
    "nonce": "0x038df8fa7e016e82ba4a6f62a70e3db8814e8373d2b90c1ebd467727da8a89df",
    "signature": "0xc5936ff6ad34cc2d2036f2bbf312323dd40b74a79a5e3fb97e5f10324bfa77bf32339fada496317f1dae31e7772b2eef52c2086d98fd5cdb729864bc3737fc131c",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}