{
  "manageEntity": {
    "action": "Save",
    "entityId": "157835916",
    "entityType": "Track",
    "nonce": "0x8dc309f8afc4dff9fe3b3a2d2039dc982c2b08d41f62933ca60689a223eb6cd0",
    "signature": "0xbc58ea1332d43f09c52d5ae205692a7e66a10fccd92f0933d7238c2bc94f9bcd45a25f3f515e7f1adbb57ad26468c5e7710d8b49542cda499f9dd0ff5433e60f1c",
    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}