{
  "manageEntity": {
    "action": "Save",
    "entityId": "339428640",
    "entityType": "Track",
    "nonce": "0x880e4a49df881c8a72e4dc1a60aa77564d7e6adda88f3bd63d760a47b8864d0e",
    "signature": "0x72ce1599012c40556cffb12ee9af7fdf1758f44bd9b406b0d932d7cf13d137020a9fe849e1757a2aafaea2a24419d9b6c9b9902d7a711dec59c29304a71181331c",
    "signer": "0x26Feee0AaDc0e2d8f7aBEd5cdb0bCD7D325F618d",
    "userId": "354535"
  }
}