Mint Burn Assets | Lucid Evolution

Minting Assets

Lucid Evolution provides comprehensive tools for minting and burning tokens on the Cardano blockchain, supporting native scripts and Plutus-based minting policies.

Minting Policy

First, we need to create a minting policy for the assets we want to mint.

In this example, we'll use a native script time-locking policy with our wallet as the required signer:

const address = await lucid.wallet().address();
 
const mintingPolicy = scriptFromNative({
  type: "all",
  scripts: [
    { type: "sig", keyHash: paymentCredentialOf(address).hash },
    {
      type: "before",
      slot: unixTimeToSlot(lucid.config().network, Date.now() + 1000000),
    },
  ],
});

Native scripts support various constructs: sig (signature), all (and), any (or), at_least (m-of-n), before (time lock), and after (time lock).

Derive the Policy ID

Next we derive the policy id from the minting policy script:

const policyId = mintingPolicyToId(mintingPolicy);

Mint Assets

Now we can mint the intended tokens according to the policy logic:

const tx = await lucid
  .newTx()
  .mintAssets({
    [policyId + fromText("MyToken")]: 1n,
    [policyId + fromText("MyOtherToken")]: 1n,
  })
  .pay.ToAddress(address, { [policyId + fromText("MyToken")]: 1n })
  .validTo(Date.now() + 900000)
  .attach.MintingPolicy(mintingPolicy)
  .complete();
 
const signed = await tx.sign.withWallet().complete();
const txHash = await signed.submit();

To burn tokens, use negative values with the mintAssets function:

const tx = await lucid
  .newTx()
  .mintAssets({
    [policyId + fromText("MyToken")]: -1n,
    [policyId + fromText("MyOtherToken")]: -1n,
  })
  .validTo(Date.now() + 900000)
  .attach.MintingPolicy(mintingPolicy)
  .complete();
 
const signed = await tx.sign.withWallet().complete();
const txHash = await signed.submit();

💡

Minting tokens creates them, but doesn't automatically send them to an address, use pay.ToAddress() to send the newly minted tokens to a specific address.

Important Considerations

All assets minted in a single mintAssets call should be of the same policy id
You can chain multiple mintAssets calls if you need to mint assets with different policy ids
The minting policy must be attached to the transaction using attach.MintingPolicy
Evolution supports Native, PlutusV1/V2/V3 minting policies
When using Plutus scripts, make sure to provide an appropriate redeemer

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