{
  "manageEntity": {
    "action": "Save",
    "entityId": "194663557",
    "entityType": "Track",
    "nonce": "0x137619c1865db5bcdefbd12b5df895633ba19df7cebf887c9e4808578e839230",
    "signature": "0x650069284b9aadd7df7ec960ab12782ea76109b04ac5a499852cf88c5ebed9551cd8f9183136f6ce49c7c8361e4aa2fc4de39968b47deeea83514b0ce10228301b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}