feature: for sol mint of cNFT, use the attributes that drip mentioned…

… so the indexers work better

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@itheum/sdk-mx-data-nft",
-  "version": "3.8.0-alpha.18",
+  "version": "3.8.0-alpha.19",
   "description": "SDK for Itheum's Data NFT Technology on MultiversX Blockchain",
   "main": "out/index.js",
   "types": "out/index.d.js",

src/cnft-sol-minter.ts

@@ -35,7 +35,7 @@ export class CNftSolMinter extends MinterSol {
    * @param datasetTitle the title of the dataset. Between 10 and 60 alphanumeric characters.
    * @param datasetDescription the description of the dataset. Between 10 and 400 alphanumeric characters.
    * @param options [optional] below parameters are optional or required based on use case
-   *                 - imageUrl: the URL of the image for the Data NFT
+   *                 - imageUrl: the URL of the image for the Data NFT (HAS to be PNG as the cNFT metadata hardcodes the filetype property as PNG)
    *                 - traitsUrl: the URL of the traits for the Data NFT
    *                 - nftStorageToken: the nft storage token to be used to upload the image and metadata to IPFS
    *                 - extraAssets: [optional] extra URIs to attached to the NFT. Can be media files, documents, etc. These URIs are public

src/common/mint-utils.ts

@@ -230,7 +230,19 @@ export function createIpfsMetadataSolCNft(
     itheum_data_stream_url: dataNFTStreamUrl,
     itheum_data_preview_url: dataNFTStreamPreviewUrl,
     itheum_data_marshal_url: dataNFTDataMarshalUrl,
-    attributes: [] as object[]
+    attributes: [] as object[],
+    animation_url: '',
+    external_url: 'https://itheum.io/datanfts-solana',
+    properties: {
+      category: 'image',
+      files: [
+        {
+          type: 'image/png',
+          uri: imageOnIpfsUrl
+        }
+      ]
+    },
+    symbol: ''
   };
 
   if (extraAssets && extraAssets.length > 0) {