how to ask nodes to proof their identity on my 3D world

[Q1000000]

Hi,
I have created this 3D world(chainofchains.space) with AI tool. I need a key function for it: letting every nodes on BTC or other blockchains be able to handle in and proof their identity. Then people can view the node info directly from this universe I built.

[ABCbits]

AFAIK it's impossible. Current Bitcoin P2P Networking[1] doesn't seem to have any call to request arbitrary data (which could be stored to request proof of identity). And while i don't know what you're trying to achieve, have you checked bitnodes website[2]? They collect and combine data they could get from other Bitcoin nodes.

[1] https://developer.bitcoin.org/reference/p2p_networking.html#version
[2] https://bitnodes.io/

[pooya87]

letting every nodes on BTC or other blockchains be able to handle in and proof their identity.

What is the benefit of that for the person running that node?

Then people can view the node info directly from this universe I built.

If all you want to represent is that node's information then they don't need to do anything. As ABCbits said, it is pretty much what sites like bitnodes do:

• Peer discovery
  Initial connection to seed nodes to fetch a bunch of reliable nodes' IP addresses followed by building an addr database (send getaddr and save each addr message they respond with)
  
• Handshake
  Sending the version and verack to receive the other node's version message
  
• Parsing version message
  This message contains the necessary information about the node like their IP & port, the services they provide, protocol version, client name and version, etc.

[NotATether]

There is no reason to request identifiers from Bitcoin nodes. Get it from a Bitcoin wallet or browser extension. Since native Bitcoin doesn't have such a feature, use Lightning Network integration or (dare I say it) WalletConnect.