A reward of 2M satoshis is embedded in a lock box with a two hour time window:
Wed May 26 2021 22:00:00 GMT +/- 1 hour
The reward: https://www.blockchain.com/btc/address/bc1qa7dn06rv2h5kejwpkahw8ueqelpjlw8nta46g3
To claim the reward you will need to hack BTCTimeLockDecryption.exe before the timelock expires. This is a Windows x64 program.
In order to help you understand how to use BTCTimeLockDecryption.exe I’ve included a demo lock box.
Here is a zip file containing Challenge_3.1_DemoLockBox.bin
You’ll need to enter the BTC block header information for a block within the target time range in order to unlock the encrypted message inside the lockbox. The demo lock box works with the following block headers:
![](https://algomachines.com/wp-content/uploads/2021/04/Challenge_3.1_Demo_ValidBlocks.bmp)
Here are valid settings for block 675647, one of the valid block for this lockbox.
![](https://algomachines.com/wp-content/uploads/2021/04/BTCTimeLockDecryption_V1.0-4.png)
Plug these values in, click Open TimeLock and you’ll see the encrypted message from the lockbox:
![](https://algomachines.com/wp-content/uploads/2021/04/Challenge_3.1_DemoMessage.bmp)
Use the following URL to access the block header values for this block: https://blockchain.info/rawblock/675647
Here’s the password for Challenge_3.1_DemoLockBox.bin: 50A812BC-431E-4C14-9561-1930C8D6C5B7
You may easily copy and paste values from the above URL (modified) for any block.
Here’s the lockbox file with the 2M satoshi reward:
The password for Challenge_3.1_data.bin is: A459D5B9-C619-432B-9176-2558E39028C8
I will be sweeping the private key with this BTC reward a few hours before this challenge expires if no one has successfully hacked the lock box by then.
Note: BTCTimeLockDecryption.exe does not access the internet at all.
Happy hacking!