Qtum recently added minting and managing NFTs (Non-Fungible Tokens) to the Qtum Web Wallet. In this blog, we follow the steps below to create some NFTs on Qtum Testnet using the Web Wallet:

1. Launch the wallet

2. Set the wallet to run on Testnet

3. Backup the wallet by downloading the key file

4. Get some Testnet QTUM from the faucet

5. Create some NFTs

6. Send some NFTs


Offline Staking address delegations to a Super Staker provide payouts according to the Proof-of-Stake algorithm: block rewards are based on estimated time with much variance. Payouts from this Super Staker Pool are made daily according to the delegated address percentage contribution to the pool. This Pool is a proof of concept for a 100% fee staking pool, to work out a simplistic data structure and node interface functions based on how Qtum Proof-of-Stake, Super Stakers, and block rewards work.

This Super Staker Pool was run as the official pool during the Testnet Stake-A-Thon (July 25 — August 24, 2020) and…


The calendar shows there are just 100 days until Qtum’s first halving on December 1, 2021. In this blog, we review the halving math and fix a previous incorrect capped supply calculation.

The Halving

Qtum halvings are based on a 4-year interval of 3,942,000 blocks. Every 4 years the block reward drops by half and will drop from 1.0 QTUM to 0.5 QTUM on December 1st, 2021.

The calculation is 3,942,000 blocks / 2,700 blocks per day = 1,460 days, or 4 years (not considering leap years).

Qtum’s first halving calculation is a little more complicated because Qtum Chain launched with 144-second…


Here is an update on the Qtum Offline Staking Stake-A-Thon which has finished its final month of June.

The June prizes have been sent out. In the Stake-A-Thon delegated address division, where 269 delegated addresses qualified for the lucky draw, with 100 winners. In the super staker division for June, there were 10 winners in the 1,000 QTUM division, and there are 15 winners in the 5,000 QTUM/90-day division. Congratulations to all the winners!

For June, there were 37,302 delegated address block rewards which represent 46.1% of overall block rewards.


With the hard fork on April 30, 2021, Qtum shifted into the FastLane with 32-second blocks. The halving blocks were adjusted to keep the same pacing for halvings, and the first halving for Qtum will be on December 1, 2021. In this blog, we review how halvings work and the schedule for Qtum halvings.

First though, why is there a halving? Miner incentives and token economics are beyond the scope of this article, but we can surmise that Satoshi wanted to give higher block rewards to attract early miners (by now everyone would mine bitcoin if they could) but did…


Here is an update on the Qtum Offline Staking Stake-A-Thon which is now in its final month of June. You can learn more about Stake-A-Thon and sign up at https://stake-a-thon.qtum.org

The May prizes have been sent out. With the new 32-second blocks it has never been easier for small stakers or delegators to win block rewards. This was shown in the Stake-A-Thon delegated address division, where 240 delegated addresses qualified for the lucky draw, with 100 winners. In the super staker division for May, there were 11 winners in the 1,000 QTUM division, and there are 13 super stakers on…


It has been a little over a month since the mainnet hard fork to FastLane 32-second blocks on April 30th, 2021. Here are the results for these speedy new blocks in this 6th and final report for the “FastLane” blog series.

This hard fork upgraded features on the blockchain and the required updates to the Qtum Core wallets only applied to the Qtum-Qt and qtumd wallets, no other wallets. Download the Qtum Core wallet’s latest version 0.20.3 from https://qtumeco.io/wallet or https://github.com/qtumproject/qtum/releases.


Qtum Core version 0.20.2 was released on March 18, 2021. This version for the Qtum-Qt and qtumd wallets (the Qtum full node staking wallets) will implement the hard fork for faster block spacing as follows:

  • Testnet block 806,600 implemented March 26, 12:48 am GMT
  • Mainnet block 845,000 on April 30, approximately 6:00 am GMT

This hard fork will upgrade features on the blockchain, and no new coin will be created. The upgrade for the hard fork only applies to the Qtum Core wallets Qtum-Qt and qtumd, no other wallets. Download Qtum Core version 0.20.2 for this mandatory update from https://qtumeco.io/wallet


Over the past 3 ½ years I have written 65 blogs on various Qtum technology topics. With this many titles it is hard to find a particular topic on Medium. For easier reference, this list presents all the blogs with a summary of each.

My personal favorite blog started the series and is still the most viewed — an ELI 5 explanation of how Qtum Proof of Stake works, with a comparison between bitcoin Proof of Work (as a marathon race) and Qtum Proof of Stake (as a stroll in the park).

The 5 most viewed blogs are

An Introduction…


Qtum Core version 0.20.2 was released on March 18, 2021. This version for the Qtum-Qt and qtumd wallets (the Qtum full node staking wallets) will implement the hard fork for faster block spacing with a hard fork as follows:

  • Testnet block 806,600 approximately March 26, approximately 1:00 am GMT
  • Mainnet block 845,000 approximately April 30, 5:30 am GMT

This is a hard fork to upgrade features on the blockchain, and no new coin will be created. The upgrade for the hard fork only applies to the Qtum Core wallets Qtum-Qt and qtumd, no other wallets.

Download Qtum Core version 0.20.2…

Jackson Belove

Blockchain researcher, occasional blogger

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