{
  "manageEntity": {
    "action": "Save",
    "entityId": "751208518",
    "entityType": "Track",
    "nonce": "0x04dd1f3ce7249447cc95035db1fff6901c75eb584281067884673830912e8f2c",
    "signature": "0x048b7346427374aded5934c2cba955a271ea0552d36be2667a6cfd133b39c3c063ecbd224ddc07a3e70382f2ae0fe2a6daa31d21211fbe768f97273895092cf11b",
    "signer": "0x44Fe9338D9d1405927C73FDA0be0F36ae481Cd39",
    "userId": "983568397"
  }
}