How to mint multiple NFT assets in the same transaction?

Question

The developer guide doesn't cover this.

Here is an example of what I'm trying to do: https://cardanoscan.io/transaction/e1c7bc707e56bf37b4325dc4b7fe524eafe8ca746e54746d60b321588ffebb6c?tab=tokenmint

I tried making the metadata look identical in structure but cardanoscan says my transaction only minted 1 coin.

I want my mint transaction to have multiple asset names.

Answer 1

The process is the same but you need to specify in your cardano-cli transaction build command, all your assets to mint. For example:

cardano-cli transaction build-raw \
  --fee 197797 \
  --tx-in 6af4fea10fe3fd7120ab7e3f5361ae15d898f4fa6ebddcf585a80865010722dd#0 \
  --tx-out $(cat key1/payment.addr)+15850022+"1 $(cat policy.id).nft1"+"1 $(cat policy.id).nft2" \
  --mint="1 $(cat policy.id).nft1"+"1 $(cat policy.id).nft2" \
  --minting-script-file policy.json \
  --metadata-json-file metadata.json \
  --invalid-hereafter=41797828 \
  --out-file transaction.raw

And of course, modify your metadata to have all your assets.

UPDATE Consider that from cardano-cli v 1.31, your asset names should be base16-encoded, this is only for the build-raw command.

Your metadata.json should look like this:

{
    "721": {
        "1573568cde0f3c340266e50f0d108795f5e4190de939081f15287a24": {
            "nft1": {
                "name": "nft#00001",
                "image": "ipfs://QmfVzQceRW7Awo1t82CrzdLeoLddQqz4SB3kNC2wiWyGAs",
                "mediaType": "image/gif",
                "description": "My TEST NFT 00001",
                "propety1": "Serie 1",
                "propety2": "Red"
            },
            "nft2": {
                "name": "nft#00002",
                "image": "ipfs://QmfVzQceRW7Awo1t82CrzdLeoLddQqz4SB3kNC2wiWyGEs",
                "mediaType": "image/gif",
                "description": "My TEST NFT 00002",
                "propety1": "Serie 1",
                "propety2": "Black"
            }
        }
    }
}