{
  "manageEntity": {
    "action": "Save",
    "entityId": "291613",
    "entityType": "Track",
    "nonce": "0x9a3eb9bfa7987d566d10eec3901c4fada95d8f44cfa0b03b507842d4f8ba6b79",
    "signature": "0x9e88e82dce1be73855c515dc469ce5c4297ffad9e27fe56ad42af66715f9128e0312c3bfea7f762552fb9c189f91e267aaaa543c3eb703f784cf047dd58008cd1c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}