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.
Transaction Signing Requirements
- Supply key
- Transaction fee payer account key
Transaction Fees
Constructor | Description |
|---|---|
new TokenMintTransaction() | Initializes a TokenMintTransaction object |
new TokenMintTransaction()
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 |
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
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
Last modified 3mo ago