{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900901343",
    "entityType": "Track",
    "nonce": "0x6e989b2bdbc88cbbb8fb4625f3b2ee6b6f4778c86f5b1f664328703035c3c780",
    "signature": "0x944fd96d4a83c2e53fdc0ccf55f110f96cb2129657748625eebbe9a4ceb2142533a58860f19888bea374fb7b58f62005e95bfa8c9c7a31a8a3ab1fb44e8f36511c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}