{
  "manageEntity": {
    "action": "Save",
    "entityId": "1649557791",
    "entityType": "Track",
    "nonce": "0x8c7999498bd9de79e25fb0f82348ffd0daf3ab07c4bf8424a333d839d835bf85",
    "signature": "0xe753bf1956224e7a8c46d755ce4d6fbea2afae4b97cc1b405bfef8bb579360ab290750a23ca9a3195dd992d8ba576823a860f2ce09379be9ffbf6bda56b9b0dd1b",
    "signer": "0xA3B40AD9bEaDeb7a11B85d9088BaC12a3F2Eca1f",
    "userId": "199809170"
  }
}