{
  "manageEntity": {
    "action": "Save",
    "entityId": "147379",
    "entityType": "Track",
    "nonce": "0xa683423ca0ec4392a70f55315327e5d751c3f190b89426ca883041bca9e38e8d",
    "signature": "0x57bfa85099e17fce76337f48c41879b1d7c1cbbd5df3e9d462d24cd81767e89d4c76fa844ecd65b7bc907cf40230298e92cac7fb2317e62888b052221fd778181b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}