{
  "manageEntity": {
    "action": "Save",
    "entityId": "121494780",
    "entityType": "Track",
    "nonce": "0x7712482c25f0a28ee2742bce8f7b5c205c831a884334f9a0c773860c84905d0c",
    "signature": "0x869670bec1cdedf8a232156e0d3fc8692f1bd81ac68b192e5339cf49c787c06816d7e1e2358b4fd00398f1bcde53af9d3028dcf689336f2db2c29ac535a9a55a1b",
    "signer": "0x94e0dDC50579175818AaCFBC9aba8B065fEf2a55",
    "userId": "460147282"
  }
}