The act of looking and finding would be a crime, because that requires you to rearrange the data in your node to reveal it, so nobody will confirm or deny its presence. Here’s an example you can try to get the proof of concept, without breaking the law, if you run a bitcoin node: bitcoin-cli getblock 00000000000000ecbbff6bafb7efa2f7df05b227d5c73dca8f2635af32a2e949 0 | tail -c+92167 | for ((o=0;o<946;++o)) ; do read -rN420 x ; echo -n ${x::130}${x:132:130}${x:264:130} ; done | xxd -r -p | tail -c+9 | head -c184292 > bitcoin.pdf This extracts a PDF file with embedded images…it just so happens to be Satoshi’s whitepaper, but it didn’t have to be!

Of course there is. Bitcoin chain has been used for all sorts of stupid data for many years.