There is an old puzzle in blockchain in address 3DfD6K4raTMZGrdMP69RRo9EUTLbAanQWX
I am not an author of this puzzle. I do not know the author.
I do not even know is it solvable.
OK, what do we have?
This is pay-to-script-hash address where the inner script is
OP_DUP
OP_IF
0267f7fa0dc404435a3f2f9ef886e034c79bd554ebd6b948ec3b0d2578eb8fa127
OP_CHECKSIG
OP_ENDIF
OP_IF
OP_13
OP_ELSE
OP_0
OP_ENDIF
OP_SWAP \
OP_HASH160 \
<push 20 bytes> > this part repeated 14 times with different hashes
OP_EQUAL /
OP_ADD /
OP_14
OP_EQUALVERIFY
OP_DEPTH
OP_0
OP_EQUAL
So, the address can be redeemed by the owner of pubkey 0267f7fa0dc404435a3f2f9ef886e034c79bd554ebd6b948ec3b0d2578eb8fa127
or anyone who can provide 14 pieces of information for specified hash values
13 of 14 pieces are already in the blockchain and the binary data contains some patterns line "PNG", "IDAT", "IEND" - so this is a png-picture. I failed to convert these pieces to a valid png-file.
14th piece of data is still unknown.
But the person who provides it can empty this address. There is not much funds on it today. Only 0.02756405 BTC.
But may be you like to solve puzzles?
I have to repeat: It is possible that this puzzle does not have solution at all