[Retric]

No, just a secret block that isn’t broadcast to everyone. 1 block a week is plenty to pull this off and that’s just 1/1,000th of the worlds mining power. Unless you get really unlucky and the block fails to enter the block chain letting someone else gets credit for the transaction.

[Aissen]

I'm curious what it's like, so here is a small calculation. Some metrics:

- 144 blocks per day are mined on average

- the current network hashrate is 145M TH/s

- a 100 TH/s rig is about $10k.

The investment to be able to have full control of mining one block on average, without electricity, internet and storage :

- per week: you'd need 143k TH/s (145M / (144 * 7)), so about $14M of investment in just the mining rig (provided you can buy it all)

- per month: you'd need 33k TH/s, so $3M of mining rig investment.

- per year: you'd need 2.7k TH/s, so about $270k in mining rig equipment.

Of course, there are a lot of variables here (e.g hashrate is highly variable), but this gives a general idea.

All this for a "washing" method that heavily implicates the miner: the address of the new coins is still known, it's not really "clean", just an unusual transaction.

[latchkey]

Now run the same numbers for ETH.

[Aissen]

No, I was just curious how big a mining pool one had to have to pull it off. I invite you to do the same for ETH if you're curious about it.

[Taek]

If you're really patient (and many big time criminals are), you only need to mine once every few months, maybe once a year or less. That's still hundreds of thousands of dollars of mining equipment, but well in reach for many.