ADVENT CALENDAR PUZZLE 12

Don't let your memes be dreams!

PUZZLE SOLUTION

Solvers

Twitter Mojo#7167 1h02
Link John Galt#0295 1min18s
Block Hash John Galt#0295 solved all (1st) 2min17s
SHA256 zert#1398 2min21s
# Arksun#0694 link+block BANsplit
# Rodrigues#3798 block BANsplit
# Kron#0582 SHA+block BANsplit
# VirtuGrana#3892 block BANsplit
# eric#4970 link BANsplit

Never Share Your Seed

Solution:

Three seeds were hidden on the page, and a bonus puzzle on Twitter.
Open the block details on creeper and look around to find 64 hexadecimal characters.

  1. The block's Block Hash
  2. The block's Link
  3. The sunflower seed image title hints at looking at the image "alt" text: "sha256". Seed is thus the SHA256 hash of the image.

In reality, it wasn't supposed to be so easy, hence a bonus puzzle on Twitter containing a question as ban_ address: 

ban_1otaa7c41ik3cf4k1jcgaf9najcm631k1ik3bshn4j46cb4o8nsz4twxespo
This address is "valid" but was generated from a particular public key (instead of a private key). Using nanoo.tools, you get the following public key: 
 57484154204241534520454E434F44455320412042414E5F414444524553533F
Recognize the hexadecimal ASCII range (most bytes begin with 4 or 5), decoding from hexadecimal gives: 
 WHAT BASE ENCODES A BAN_ADDRESS?
The alphabet used for ban_ address has 32 characters, the answer is Base32.

Note: The bonus puzzle was the one intended. So, what happened? The block I sent leaked the address in the "Link". Oh well.

Show Puzzle

Do Not Share Your Seed

sha256