Batch Mint NFTs

You can create an application that mints multiple NFTs at one time, using a for loop to send one transaction after another.

A best practice is to use Tickets to reserve the transaction sequence numbers. If you create an application that creates NFTs without using tickets, if any transaction fails for any reason, the application stops with an error. If you use tickets, the application continues to send transactions, and you can look into the reason for any individual failures afterward.

Usage

You can download or clone the Quickstart Samplesto try the sample in your own browser.

Get an Account

Open and run lesson7-batch-minting.py.
Get a test account.
1. If you want to use an existing account seed:
  1. Paste the account seed in the Standby Seed field.
  2. Click Get Standby Account.
2. If you do not want to use an existing account seed, just click Get Standby Account.
Click Get Standby Account Info to get the current XRP balance.

Batch Mint NFTs

This example lets you mint multiple NFTs for a single unique item. The NFT might represent "prints" of an original artwork, tickets to an event, or another limited set of unique items.

To batch mint non-fungible token objects:

Enter the NFT URI. This is a URI that points to the data or metadata associated with the NFT object. You can use this sample URI if you do not have one of your own: ipfs://bafybeigdyrzt5sfp7udm7hu76uh7y26nf4dfuylqabf3oclgtqy55fbzdi.
Set the Flags field. For testing purposes, we recommend setting the value to 8. This sets the tsTransferable flag, meaning that the NFT object can be transferred to another account. Otherwise, the NFT object can only be transferred back to the issuing account. See NFTokenMint for available NFT minting flags.
Enter the Transfer Fee, a percentage of the proceeds that the original creator receives from future sales of the NFT. This is a value of 0-50000 inclusive, allowing transfer fees between 0.000% and 50.000% in increments of 0.001%. If you do not set the Flags field to allow the NFT to be transferrable, set this field to 0.
Enter the Taxon for the NFT. If you do not have a need for the Taxon field, set this value to 0.
Enter an NFT Count of up to 200 NFTs to create in one batch.
Click Batch Mint NFTs.

Get Batch NFTs

Click Get Batch NFTs to get the current list of NFTs for your account.

The difference between this function and the getTokens() function used earlier is that it allows for larger lists of tokens, sending multiple requests if the tokens exceed the number of objects allowed in a single request.

Code Walkthrough

You can download or clone the Quickstart Samplesto try each of the samples locally.

Import dependencies and define the testnet_url variable.

import xrpl
from xrpl.clients import JsonRpcClient
from xrpl.wallet import Wallet
from xrpl.models.requests import AccountNFTs

testnet_url = "https://s.altnet.rippletest.net:51234"

Batch Mint

Pass the values seed, uri, flags, transfer_fee, taxon, and count.

def batch_mint(seed, uri, flags, transfer_fee, taxon, count):
    """batch_mint"""

Get the account wallet and a client instance.

    wallet=Wallet.from_seed(seed)
    client=JsonRpcClient(testnet_url)

Request the full account info.

    acct_info = xrpl.models.requests.account_info.AccountInfo(
        account=wallet.classic_address,
        ledger_index='validated'
    )
    get_seq_request = client.request(acct_info)

Parse the current sequence value.

    current_sequence=get_seq_request.result['account_data']['Sequence']

Create a transaction to create tickets, starting at the current sequence number.

    ticket_tx=xrpl.models.transactions.TicketCreate(
        account=wallet.address,
        ticket_count=int(count),
        sequence=current_sequence  
    )

Submit the ticket transaction and wait for the result.

    response=xrpl.transaction.submit_and_wait(ticket_tx,client,wallet)

Create a request to obtain the next ticket number.

    ticket_numbers_req=xrpl.models.requests.AccountObjects(
        account=wallet.address,
        type='ticket'
    )
    ticket_response=client.request(ticket_numbers_req)

Create the tickets variable to store an array of tickets.

    tickets=[int(0)] * int(count)
    acct_objs= ticket_response.result['account_objects']

Create an array of ticket numbers.

    for x in range(int(count)):
        tickets[x] = acct_objs[x]['TicketSequence']

Initialize variables to be used in the mint loop.

    reply=""
    create_count=0

Use a for loop to send repeated mint requests, using the ticket_sequence field to uniquely identify the mint transactions.

    for x in range(int(count)):
        mint_tx=xrpl.models.transactions.NFTokenMint(
            account=wallet.classic_address,
            uri=xrpl.utils.str_to_hex(uri),
            flags=int(flags),
            transfer_fee=int(transfer_fee),
            ticket_sequence=tickets[x],
            sequence=0,
            nftoken_taxon=int(taxon)
        )

Submit each transaction and report the results.

        try:
            response=xrpl.transaction.submit_and_wait(mint_tx,client,
                wallet)
            create_count+=1 
        except xrpl.transaction.XRPLReliableSubmissionException as e:
            reply+=f"Submit failed: {e}\n"
    reply+=str(create_count)+' NFTs generated.'
    return reply

Get Batch

This version of getTokens() allows for a larger set of NFTs by watching for a marker at the end of each batch of NFTs. Subsequent requests get the next batch of NFTs starting at the previous marker, until all NFTs are retrieved.

def get_batch(seed, account):
    """get_batch"""

Get a client instance. Since this is a request for publicly available information, no wallet is required.

    client=JsonRpcClient(testnet_url)

Define the request for account NFTs. Set a return limit of 400 objects.

    acct_nfts=AccountNFTs(
        account=account,
        limit=400
    )

Send the request.

    response=client.request(acct_nfts)

Capture the result in the responses variable.

    responses=response.result

While there is a marker value in the response, continue to define and send requests for 400 account NFTs at a time. Capture the result from each request in the responses variable.

    while(acct_nfts.marker):
        acct_nfts=AccountNFTs(
            account=account,
            limit=400,
            marker=acct_nfts.marker
        )
        response=client.request(acct_nfts)
        responses+=response.result

Return the responses variable.

    return responses

lesson7-batch-minting.py

This form is based on earlier examples, with unused fields, handlers, and buttons removed. Additions are highlighted below.

import tkinter as tk
import xrpl
import json

from mod1 import get_account, get_account_info

Import dependencies from mod7.py.

from mod7 import batch_mint, get_batch

Add Module 7 handlers.


def batch_mint_nfts():
    results = batch_mint(
        ent_standby_seed.get(),
        ent_standby_uri.get(),
        ent_standby_flags.get(),
        ent_standby_transfer_fee.get(),
        ent_standby_taxon.get(),
        ent_standby_nft_count.get()
    )
    text_standby_results.delete("1.0", tk.END)
    text_standby_results.insert("1.0", json.dumps(results, indent=4))

def standby_get_batch_nfts():
    results = get_batch(
        ent_standby_seed.get(),
        ent_standby_account.get()
    )
    text_standby_results.delete("1.0", tk.END)
    text_standby_results.insert("1.0", json.dumps(results, indent=4))

# Module 1 Handlers
def get_standby_account():
    new_wallet = get_account(ent_standby_seed.get())
    ent_standby_account.delete(0, tk.END)
    ent_standby_seed.delete(0, tk.END)
    ent_standby_account.insert(0, new_wallet.classic_address)
    ent_standby_seed.insert(0, new_wallet.seed)

def get_standby_account_info():
    accountInfo = get_account_info(ent_standby_account.get())
    ent_standby_balance.delete(0, tk.END)
    ent_standby_balance.insert(0,accountInfo['Balance'])
    text_standby_results.delete("1.0", tk.END)
    text_standby_results.insert("1.0",json.dumps(accountInfo, indent=4))

Rename the window for Module 7.

# Create a new window with the title "Python Module - Batch Minting"
window = tk.Tk()
window.title("Python Module - Batch Minting")



# Form frame
frm_form = tk.Frame(relief=tk.SUNKEN, borderwidth=3)
frm_form.pack()

# Create the Label and Entry widgets for "Standby Account"
lbl_standy_seed = tk.Label(master=frm_form, text="Standby Seed")
ent_standby_seed = tk.Entry(master=frm_form, width=50)
lbl_standby_account = tk.Label(master=frm_form, text="Standby Account")
ent_standby_account = tk.Entry(master=frm_form, width=50)
lbl_standby_balance = tk.Label(master=frm_form, text="XRP Balance")
ent_standby_balance = tk.Entry(master=frm_form, width=50)
lbl_standby_uri = tk.Label(master=frm_form, text="NFT URI")
ent_standby_uri = tk.Entry(master=frm_form, width=50)
lbl_standby_flags = tk.Label(master=frm_form, text="Flags")
ent_standby_flags = tk.Entry(master=frm_form, width=50)
lbl_standby_transfer_fee = tk.Label(master=frm_form, text="Transfer Fee")
ent_standby_transfer_fee = tk.Entry(master=frm_form, width="50")
lbl_standby_taxon = tk.Label(master=frm_form, text="Taxon")
ent_standby_taxon = tk.Entry(master=frm_form, width="50")
lbl_standby_nft_id = tk.Label(master=frm_form, text="NFT ID")
ent_standby_nft_id = tk.Entry(master=frm_form, width="50")
lbl_standby_nft_offer_index = tk.Label(master=frm_form, text="NFT Offer Index")
ent_standby_nft_offer_index = tk.Entry(master=frm_form, width="50")

Add the NFT Count field for batch minting.

lbl_standby_nft_count=tk.Label(master=frm_form, text="NFT Count")
ent_standby_nft_count=tk.Entry(master=frm_form, width="50")
lbl_standby_results = tk.Label(master=frm_form,text="Results")
text_standby_results = tk.Text(master=frm_form, height = 20, width = 65)

# Place field in a grid.
lbl_standy_seed.grid(row=0, column=0, sticky="w")
ent_standby_seed.grid(row=0, column=1)
lbl_standby_account.grid(row=2, column=0, sticky="e")
ent_standby_account.grid(row=2, column=1)
lbl_standby_balance.grid(row=5, column=0, sticky="e")
ent_standby_balance.grid(row=5, column=1)
lbl_standby_uri.grid(row=8, column=0, sticky="e")
ent_standby_uri.grid(row=8, column=1, sticky="w")
lbl_standby_flags.grid(row=9, column=0, sticky="e")
ent_standby_flags.grid(row=9, column=1, sticky="w")
lbl_standby_transfer_fee.grid(row=10, column=0, sticky="e")
ent_standby_transfer_fee.grid(row=10, column=1, sticky="w")
lbl_standby_taxon.grid(row=11, column=0, sticky="e")
ent_standby_taxon.grid(row=11, column=1, sticky="w")

Place the NFT Count field in the grid.

lbl_standby_nft_count.grid(row=13, column=0, sticky="e")
ent_standby_nft_count.grid(row=13, column=1, sticky="w")
lbl_standby_results.grid(row=14, column=0, sticky="ne")
text_standby_results.grid(row=14, column=1, sticky="nw")

#############################################
## Buttons ##################################
#############################################

# Create the Standby Account Buttons
btn_get_standby_account = tk.Button(master=frm_form, text="Get Standby Account",
                                    command = get_standby_account)
btn_get_standby_account.grid(row=0, column=2, sticky = "nsew")
btn_get_standby_account_info = tk.Button(master=frm_form,
                                         text="Get Standby Account Info",
                                         command = get_standby_account_info)
btn_get_standby_account_info.grid(row=1, column=2, sticky = "nsew")

Add the Batch Mint NFTs and Get Batch NFTs buttons.

btn_standby_batch_mint = tk.Button(master=frm_form,
                                         text="Batch Mint NFTs",
                                         command = standby_batch_mint)
btn_standby_batch_mint.grid(row=5, column=2, sticky = "nsew")
btn_standby_get_batch_nfts = tk.Button(master=frm_form,
                                         text="Get Batch NFTs",
                                         command = standby_get_batch_nfts)
btn_standby_get_batch_nfts.grid(row=8, column=2, sticky = "nsew")
# Start the application
window.mainloop()