{
  "manageEntity": {
    "action": "Save",
    "entityId": "242809",
    "entityType": "Track",
    "nonce": "0x39458e2eb0581f15be77d59333c247107cbb860226fa0d8e636788a22c7c1937",
    "signature": "0x38a577a605a14c554f670220c9f832da04dc0475f0674c28177fcfc2174f9151684186b238224f4ec2dc1596393f377fffa494c0f358a04db92c2c78437e99071b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}