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How can one secure Web3 JSON-RPC API endpoint?

I suggest you to use Caddy as a reverse proxy with HTTP Basic Authentication. Caddy comes with built-in TLS (HTTPS) certificate manager which makes the setup easier. Here is an example Caddyfile ...
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Error importing transaction: Transaction(InvalidChainId) in Private POA

If transactions were imported from another chain, it may fail due to Ethereum reply-protection feature that prevents using Ethereum Classic transactions to work on Ethereum.
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