{
  "manageEntity": {
    "action": "Save",
    "entityId": "640374421",
    "entityType": "Track",
    "nonce": "0x575873cc268bd2020d266d43034b85bd95b3c1604cab484d28c0e32bdd584aec",
    "signature": "0x8be180ae020dc1844110a286bc38087a8848e97a83c0c55bc7039ffc4d94d7c15b3a28711de6072dc1fca0497b29933b38030cccdcc9a04caf54ebd0e54e441a1b",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}