Assuming you know the hd key's private & public info, and you have a given address is there an easy way to know whether or not that address is derived from said hdkey?

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Other than just deriving a ton of potential keys and checking whether they correspond to the address, no. There is no mathematical relation between keys in a HD keychain that allows you to determine whether they are in that keychain.

  • Yikes. Okay so I suppose I'll need to check my database if an address receives value. Thanks!
    – Trevor
    Commented Sep 12, 2021 at 5:29

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