Market NFT Metadata Format

{
  "description": "Will Obama win the election in 2024?", 
  "external_url": "https://foreprotocol.io/markets/nft/14", 
  "image": "https://api.foreprotocol.io/images/markets/14.jpg", 
  "name": "ForeMarket #14",
  "attributes": [  
    {
      "trait_type": "Category", 
      "value": "Politics"
    },
    {
      "display_type": "date", 
      "trait_type": "Predictions starts", 
      "value": 1650000000
    },
    {
      "display_type": "date", 
      "trait_type": "Predictions ends", 
      "value": 1660000000
    },
  ], 
}