{
  "manageEntity": {
    "action": "Save",
    "entityId": "848978148",
    "entityType": "Track",
    "nonce": "0x585e81909a7aa3ab2cba049a9833c18afcb1c996e45b6e4bcace316c6f5cc94c",
    "signature": "0x8de7404a533676b0b935afa622904562db6cf8e4e38524cd8fbf8090ac2975043fbedd5cc0b843c36f7f2265dd40501876ff8dd6dc60ea42752ba8955ab90f541c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}