So if you have left over coins that you sent back to your electrum wallet, can you send those to a blockchain wallet and then to coinbase to cash out? Or should you tumble, or even send to a few of your electrum addresses to kind of tumble? It is less then 600.
Also a bonus question, anyone know if you have to pay taxes on the amount you sell on cb?
I would tumble these coins first if they have any taint from a known market wallet.
You are required to report any gains/losses that you make on buying and selling bitcoins in most countries around the world.