Old Main Augustana.jpg

[amaclin]

https://blockchain.info/tx/033d185d1a04c4bd6de9bb23985f8c15aa46234206ad29101c31f4b33f1a0e49

[1714704709]

1714704709

[1714704709]

1714704709

[1714704709]

1714704709

[1714704709]

1714704709

[tspacepilot]

Okay, I'll bite, I'm curious.

I see this in OP RETURN:

 "jLN Augustana College Old-Main.jpg Reconstruct with data preceding redeemscripts"

So I guess you've got the jpeg file in there somewhere (I didn't look at the whole raw transaction or try finding it).

What was the point here?  What am I missing?

[amaclin]

the image is encoded in scriptSigs as raw binary chunks.
this is a method to store in blockchain more than 80 bytes of data as in OP_RETURN output
(I am not a sender/creator of this transaction)

[dE7ERV]

Is there a purpose to putting images in tx? Or just for testing capabilities?

[readerbtc]

I think the purpose is to sabotate the blockchain uploading illegal images.

[systemv]

Fascinating. I wonder if somebody played with opposite case - steganography related to blockchain. Hiding a private key inside a picture or using picture as a seed to generate key it would be interesting...

[tspacepilot]

Fascinating. I wonder if somebody played with opposite case - steganography related to blockchain. Hiding a private key inside a picture or using picture as a seed to generate key it would be interesting...

The latter is trivially easy, right?

Code:

$ cat dispicture.jpg | sha256sum | privkeytowif.sh

[amaclin]

Please note, that the image was slightly changed by image hosting site imgur.com
You should decode binary from the transaction yourself to find anything intersting

I think that there is no steganography in it.
If you want private keys - you can take them from my forum signature