We set some restrictions,for example, the Qutxo must be more than 1 Btc and coin age of 3 years or more. The calculation pressure will be much smaller.

this requires that each node have a DAG function, but now ,some node is a wallet. So,  I think , we maybe design a new `pow` to save the bitcoin question.Of course, I agree with your opinion of DAG.

yeah! you are right. But the pow cannot avoid  wealth Concentration question. So, the new algorithm maybe avoid the question.

We can discuss together!
The rules for selecting QUtxo are as follows：
First, Miner make the `genetic graphs‘ of the utxo in the new transcations. Then , chose the Qutxo with Genetic relationships .

DPOS and POS all are more efficient  than POW, and the DAG is  different from others. But the DPOS and POS caused the wealth to be centralized. Now, I've been thinking about a new consensus mechanism lately. It is based on utxo.

the POW Algorithm of Bitcoin is that Calculate a hash problem with a target and  random. I want to replace random with the utxo.
Everyone chose a utxo and broadcast before mine the new block, it will be collect with transactions. Miners mine blocks with the utxos and select the the most qualified utxo(Qutxo). The  owner of Qutxo will be rewarded and the Qutxo status will be tarded .