[posting_mess]

I could be off, its been a while since ive been in crypto - take with a pinch of salt;

Bitcoins dont really exist, they aren't a row with a "uuid" that we can just say "block bitcoin X". Its a ledger so you are worth the sum of transactions on the ledger against "wallet x" at any particular time. Blocks are really just "diffs" and if you sum those diffs you get to a "balance" that the network can verify and allow you to spend.

So when you want to block "some bitcoins" you have to "follow the money", which will get you to wallet address. It's easy to block a single wallet address but the the criminals just split that one bitcoin into 10K addresses, now you have to follow that set of transactions and block 10K addresses.

The implications / problem gets worse as you consider finical crimes like in the UK, gangs will transfer £1K/£2k to some young persons bank and ask them to with draw 90% of it. Should we permanently remove a young person from the network cause of 1 mistake? Should we force them to go through the risk of setting up a new address?

Then of course the mixers / LN / complicated transaction tree's (blockchian hoping, ETC) - its a bit of nightmare.

Its not unsolvable, but I cant imagine its an easy task by any metric.