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Monitor domains used by DNS seeds in Bitcoin Core and Bitcoin Knots

Problem: DNS seeds and security

Solution: I want to create a website which does the following:

Check ‘A’ record for all domains used by 9 DNS seeds every 5 minutes
Save all IP addresses in local database
Check if these are bitcoin nodes
Mark ✅ for DNS seed which has no issues, mark ⚠️ for DNS seed in which some IP addresses have issues and mark ❌ for DNS seed in which all IP addresses look suspicious

Why?

It will help in monitoring domains used by DNS seeds for any issues and alert users if one of them has some issues because hacked or other reasons.

Question: What exactly should I check in third step to consider an IP address as a bitcoin node with no issues? A normal bitcoin node would have some IP address, responding on port 8333 with UA string like /Satoshi:0.21.1/ however nodes used by attacker can also do the same thing?

Sub-question: What kind of IP addresses or nodes would an attacker use if gets access to the DNS of one of the domains?

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CryptoCurrencyAUDChange 1hChange 24hChange 7d
Bitcoin80,961 0.03 % 3.35 % 5.64 %
Ethereum5,624.1 0.58 % 0.26 % 8.86 %
Binance Coin644.12 0.14 % 0.80 % 0.87 %
Tether1.330 0.09 % 0.03 % 0.05 %
Cardano2.860 0.14 % 1.89 % 1.55 %
Solana270.19 0.10 % 2.79 % 29.91 %
XRP1.480 0.03 % 0.61 % 1.74 %
Polkadot59.88 0.32 % 1.97 % 8.70 %
Dogecoin0.3468 0.78 % 1.70 % 5.78 %
USD Coin1.330 0.20 % 0.08 % 0.33 %

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