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[hanh]

Zkool - The successor to Ywallet

No, I don’t think anything supports 5K private keys these days. I don’t think they were ever supported in zcash. Even in Bitcoin, they were deprecated ~2013 and zcash was launched in 2016. The protocol may allow them. But you will need to write your own code. Depending on the amount you have, it may be a viable solution.