{
  "manageEntity": {
    "action": "Save",
    "entityId": "290554",
    "entityType": "Track",
    "nonce": "0x03cc24c834d520af962071ab12de61ba92ce45489f499df5ca75bd626a27aa4a",
    "signature": "0x76382439c1b4e576f600c59a12e52460ffab12a495f92eacb335021eb1f3601119a0291c90ccf612b296dc9be604cb7b1bea1561c82280f410325afc76e202831b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}