{
  "manageEntity": {
    "action": "Save",
    "entityId": "274821",
    "entityType": "Track",
    "nonce": "0x4ddaff73052cc2374298dcc67a500861d6f43a0491c7abaa0f0b3bdf9d56ef24",
    "signature": "0xcfc69ebadb75cf1c0e51ba97a8bec7633b80d67ff76ec9705a36b49e8088f6347e9f152da0be4c292995491598c7526df8577f395e199461e577a5fa3007eafa1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}