{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421708153",
    "entityType": "Track",
    "nonce": "0x85a3a488aac020dcd68bcc119d0dc53873cb748ef7af7b3c1bc2df97bcd91f4b",
    "signature": "0xff33e35cf06f248a25dfbe798efde912a31bedfe75d865c2db2f9185273e3e8c34b1f290c789137dabbf0689fc3100f6b98dd9c5189e0b5127833f10c047737c1b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}