{
  "manageEntity": {
    "action": "Save",
    "entityId": "1590568015",
    "entityType": "Track",
    "nonce": "0x86bc862d9b9b86760035601e11147549696d584556e176b1710990c706f85bd7",
    "signature": "0x7b7991c333ebc4a398a8be26983982314b5ce5b883c3612a7ccf80eb9edeb4d94f619893d3246f0fff2c8ae3831d7e4c3794088ad7be73044a80da5c663b55e31b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}