{
  "manageEntity": {
    "action": "Save",
    "entityId": "438578507",
    "entityType": "Track",
    "nonce": "0xf3adc9ecedea67f280417bccd22be61963e96d1ae5a485a3843297017014949f",
    "signature": "0xa27f508f4231683ca1dc65b38e2dd1f59de614f25ee3687ae8ad4a4cb24037926fe9079190536b70ad35ea5e252b3ba5c2c3db2850c10e887a0ee6df3c8d121f1b",
    "signer": "0x90CBf7c9BBF688fd9Fa4029B96e1BC32b270cA24",
    "userId": "711459379"
  }
}