{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618518478",
    "entityType": "Track",
    "nonce": "0x7551306c8e5c4963eaea7f74a9a76086a7fefc63ce3d1897d7b21eb5ee6e4a57",
    "signature": "0x005554108d1e161be183d95aba532750b0e1121d9cc696a792fa5965e2e978651f1e4faf5a3d5a599d87941603baddc0ef931587c27cf63b23ab09b263d0f44e1b",
    "signer": "0x136A4e19270387bc21d7e58a9592D46864B0Ad57",
    "userId": "956002390"
  }
}