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mint-a-token.md

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Mint a token

Minting fungible token allows you to increase the total supply of the token. Minting a non-fungible token creates an NFT with its unique metadata for the class of NFTs defined by the token ID. The Supply Key must sign the transaction.

  • If no Supply Key is defined, the transaction will resolve to TOKEN_HAS_NO_SUPPLY_KEY. The maximum total supply a token can have is 2^63-1.
  • The amount provided must be in the lowest denomination possible.
    • Example: Token A has 2 decimals. In order to mint 100 tokens, one must provide an amount of 10000. In order to mint 100.55 tokens, one must provide an amount of 10055.
  • The metadata field is specific to NFTs. Once an NFT is minted, the metadata cannot be changed and is immutable.
    • You can use the metadata field to add a URI that contains additional information about the token. You can view the metadata schema here. The metadata field has a 100 character limit.
  • The serial number for the NFT is returned in the receipt of the transaction.
  • When minting NFTs, do not set the amount. The amount is used for minting fungible tokens only.
  • This transaction accepts zero unit minting operations for fungible tokens (HIP-564)

Transaction Signing Requirements

  • Supply key
  • Transaction fee payer account key

Transaction Fees

  • Please see the transaction and query fees table for base transaction fee
  • Please use the Hedera fee estimator to estimate your transaction fee cost
Constructor Description
new TokenMintTransaction() Initializes a TokenMintTransaction object 
new TokenMintTransaction()

Methods

{% tabs %} {% tab title="V1" %}

Method Type Description Requirement
setTokenId(<tokenId>) TokenId The token for which to mint tokens Required
setAmount(<amount>) long The amount to mint to the Treasury Account. Amount must be a positive non-zero number represented in the lowest denomination of the token. The new supply must be lower than 2^63. Required
addMetadata(<metadata>) byte[] Applicable to tokens of type NON_FUNGIBLE_UNIQUE. A list of metadata that are being created. The maximum allowed size of each metadata is 100 bytes. Optional
addMetadata(<metadatas>) List<byte[]> Applicable to tokens of type NON_FUNGIBLE_UNIQUE. A list of metadata that are being created.The maximum allowed size of each metadata is 100 bytes. Optional
addMetadata(<metadatas>) String Applicable to tokens of type NON_FUNGIBLE_UNIQUE. A list of metadata that are being created. The maximum allowed size of each metadata is 100 bytes. Optional

{% code title="Java" %}

//Mint another 1,000 tokens
TokenMintTransaction transaction = new TokenMintTransaction()
    .setTokenId(newTokenId)
    .setAmount(1000);

//Build the unsigned transaction, sign with the supply private key of the token, submit the transaction to a Hedera network
TransactionId transactionId = transaction.build(client).sign(supplyKey).execute(client);
    
//Request the receipt of the transaction
TransactionReceipt getReceipt = transactionId.getReceipt(client);
    
//Obtain the transaction consensus status
Status transactionStatus = getReceipt.status;

System.out.println("The transaction consensus status is " +transactionStatus);
//Version: 1.2.2

{% endcode %}

{% code title="JavaScript" %}

//Mint another 1,000 tokens
const transaction = new TokenMintTransaction()
    .setTokenId(newTokenId)
    .setAmount(1000);

//Build the unsigned transaction, sign with supply private key of the token, submit the transaction to a Hedera network
const transactionId = await transaction.build(client).sign(supplyKey).execute(client);
    
//Request the receipt of the transaction
const getReceipt = await transactionId.getReceipt(client);
    
//Obtain the transaction consensus status
const transactionStatus = getReceipt.status;

console.log("The transaction consensus status is " +transactionStatus);
//Version 1.4.2

{% endcode %} {% endtab %} {% endtabs %}