BTC recovery from registration details without wallet.dat I started mining march 2009, i remember registering. is there any way to get my BTC back from the registration process? I know you need the wallet.dat and the password or key to access the BTC, but is there any way to get my BTC back. I am desperate, the fact that i know i have money out in the ether, but yet have none is killing me. I vaguely remember when i signed up they just added a registration process that linked my info to the coins i generated in 03/2009. I know there are lists of dormant addresses, can they be used to get my BTC back? Please help
is there any way to get my BTC back from the registration process?

In general there is no registration process for buying or mining bitcoin or for most types of bitcoin wallet. Certainly not in 2009.

I started mining march 2009, i remember registering.

There is no registration process for mining. At least not in the January 2009 Bitcoin software released by Satoshi Nakamoto.
At that time, I believe mining would have placed any mined coins into an address controlled by the private-key in a wallet on your PC.
Registering for a custodial wallet service (trading/exchange service)
There may have been a registration process if you had a &quot;custodial&quot; wallet, a type of wallet where you arranged with a third party for them to manage your wallet on your behalf. There are many such companies, all different. In that case you would have to contact the specific company that you registered with. This would not have been the case in March 2009 but maybe in later years you signed up with a custodial-wallet business to use their trading services? (In any case, this paragraph may be helpful to later searchers who find this question because they have the problem expressed in the title).

there are lists of dormant addresses, can they be used to get my BTC back?

No. To regain control of the BTC you need the private-key that was stored in the wallet. The address is not enough.