{
  "manageEntity": {
    "action": "Save",
    "entityId": "921450179",
    "entityType": "Track",
    "nonce": "0x9842ac15b42b3a64e4c41fa8e5067a1830ba1f35a6449554a7f08376db7cbaa0",
    "signature": "0xf1069287a94d883889d404656d078b6c74b31b54de0c86353c41a39a0a509e75788124c17c5299f191599a92fba3e9ade505167cb477fdad6884d25fd02160121c",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}