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Probably used the technique described here, https://bitcoin.stackexchange.com/questions/25814/ecdsa-sign...

It's much easier! Just call ethereum's `crypto.ToECDSA` [1] with a big-endian encoded 256-bit unsigned integer of interest, e.g. 0x1 or 0x100, as described in the article. Try the resulting private key.

[1] https://godoc.org/github.com/ethereum/go-ethereum/crypto#ToE...

Y'all are talking about two different things.

Secret key recovery via nonce reuse(linked SO post) is a different than simply trying a range of integers which is mostly what these researchers did.

There are many addresses created from integers under 1000000. This is nothing special. There are also many addresses created from basic words converted to sha256 and the used as the primary key hex. Eg, ‘Satoshi Nakamoto’ .

This is what they did: https://www.securityevaluators.com/casestudies/ethercombing/

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