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Blockchain cannot implement real-name systems! This is determined by the nature of blockchain; if there is a real-name system, then it is not blockchain! Just look at the following points, and you'll understand that a real-name system cannot be implemented within blockchain.
For example, A transferred one Bitcoin to B.
1. Anyone can participate in transactions on the blockchain, regardless of whether you are abcdefg. A and B can trade directly in a peer-to-peer manner without any intermediary institutions; this is the decentralization of blockchain.
2. All users on the blockchain can see that a transferred one Bitcoin to b, which is openness.
3. A transferred one Bitcoin to B, recorded in all nodes, which can be traced in all nodes. This is the traceability of blockchain.
4. A transferred one Bitcoin to B, recorded in all nodes. If you want to tamper with this information, you need to tamper with all nodes around the world, which is an impossible task. This also demonstrates the immutability of blockchain.
5. The most important aspect is anonymity. On the blockchain, all nodes and everyone globally can see that a transferred one Bitcoin to b, but no one knows who a is and who b is. This is the characteristic of anonymity in blockchain.