I've been exploring the json dumps of each block through ./tezos-client rpc get /chains/main/blocks/<bid> and wanted to know the block heights at which some important changes might have happened to the protocol in its current history that would have modified/added new json fields.

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You can find the height of the first and the last block of each protocol in some block explorers (e.g. https://tezos.id/protocols).

You can also consult the documentation's Protocols section (starting from 003), which should capture these changes.

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