Blockchain.info might have old stale-block data

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https://blockchain.info/block-height/$block_height?format=json returns a list!

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I played around with curl -s https://blockchain.info/block-height/901939?format=json | jq '.blocks | length' for some recent heights with known stale blocks, but it seems to return 1 always.

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In #96 @deadmanoz mentioned that the web archive might have some headers preserved:

The headers were recovered from Wayback Machine captures of blockchain.info/block/ and blockchain.info/block-index// pages crawled between 2013-03-14 and 2013-05-01. Scanning the Wayback capture index against the 32 fork hashes yielded 7 with preserved HTML content.