{
  "manageEntity": {
    "action": "Save",
    "entityId": "577460",
    "entityType": "Track",
    "nonce": "0x1ab73f1c9aceb3de84642c18b97b29e7c1acd064b5671b4bb77506855c384c3b",
    "signature": "0xa0e29ebfbaedf1db14effb381504426bde0f37bf8e64d39355525cd5f4497b713428f8c71e5703df884d4e5ee524dc23742d891e874f42abffce815d718d269c1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}