MSPT (Microsponsors Time Slot) Token URI Metadata

mspt-tokenuri.js

// MSPT tokens (Microsponsors Time Slot) 
// Metadata Sketch for tokenURI()
// OpenSea Docs: 
//   docs.opensea.io/docs/2-adding-metadata
//   docs.opensea.io/docs/metadata-standards
// Example:
//   https://opensea-creatures-api.herokuapp.com/api/creature/3

{
  "name": "MSPT #220: <propertyName>", // MSPT on-chain data
  "description": "300 x 250 pixel time slot on foo.com available for sponsorship",
  "image": "https://cdn.foo.com/thumbnail/50.png", // OpenSea reco's 350 x 350px, billboard format metadata
  "external_url": "https://microsponsors.io/exchange.html?view=auctions&sort=token:51", // MSPT single token view
  "attributes": [
    
    {
      "trait_type": "Category", // MSPT on-chain data
      "value": "Website" 
    },
    
    {
      "display_type": "date",  // MSPT on-chain data
      "trait_type": "Start Time", 
      "value": 1546360800 // Unix timestamp
    },
 
    {
      "display_type": "date", // MSPT on-chain data
      "trait_type": "End Time", 
      "value": 1546360800 // Unix timestamp
    }, 
    
    {
      "display_type": "date", // MSPT on-chain data
      "trait_type": "Auction End Time", // Microsponsors dapp uses this for its auctions
      "value": 1546360800 // Unix timestamp
    },     
    
    {
      "trait_type": "Secondary Trading",  // MSPT on-chain data
      "value": "True" // String (not boolean)
    },     
    
    
    //
    //  Conditionally include the following fields 
    //  IF time slot is tied to a Billboard that 
    //  has them defined:
    //
    
    {
      "trait_type": "Width (pixels)", // Optional, billboard format metadata
      "value": 300
    },
    
    {
      "trait_type": "Height (pixels)", // Optional, billboard format metadata
      "value": 250
    },
    
    // These two are mutually exclusive:
    
    {
      "trait_type": "Image", // Optional, billboard format metadata
      "value": "True" // String not boolean
    }, 
    
    {
      "trait_type": "Text-Only", // Optional, billboard format metadata
      "value": "True" // String not boolean
    }, 
    
    // end mutually exclusive fields
    
    {
      "trait_type": "Headline Length", // Optional, billboard format metadata
      "value": 64 // Number
    }, 
    
    {
      "trait_type": "Description Length", // Optional, billboard format metadata
      "value": 64 // Number
    }, 
 
    {
      "trait_type": "CTA Length", // Optional, billboard format metadata
      "value": 20 // Number
    }, 
                
    // MSPT metadata added by Sponsor in Time Slot Manager after purchase
    // WONT be visible on OpenSea bc these fields do not conform to their format:
    
    {
      "sponsor_defined_fields": {
          "text": "foobar zipzap 123",
          "image": "https://cdn.foo.com/my_sponsor_image.png",
          "link": "https://foo.com/landing_page",
      }
    }
    
  ]
}