{
  "manageEntity": {
    "action": "Save",
    "entityId": "698501199",
    "entityType": "Track",
    "nonce": "0xbe89728b15521400ae33b0d70b5bab603a346522cad0351835d02d1b5737f3e0",
    "signature": "0xb8ec07f9b9ed27f4d03b9b2bc8cedf13a0db6cccf02f03668126eb7108529d7d080af32d2ead74bf9cf5aa68b0eb1715ebda34d434ce9b22ece82019b36885f21c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}