[BIP32](https://bips.xyz/32) is used to derive the path `m/44'/1237'/<account>'/0/0` (according to the Nostr entry on [SLIP44](https://github.com/satoshilabs/slips/blob/master/slip-0044.md)).
A basic client can simply use an `account` of `0` to derive a single key. For more advanced use-cases you can increment `account`, allowing the generation of practically infinite keys from the 5-level path with hardened derivation.
Nostr public keys have extra compression compared to Bitcoin compressed public keys, meaning that the y-coordinate is not only omitted, but parity is not even indicated with the '03'(odd), nor '02' (even) prefixes. In other words, only the x-coordinate is included without any extra prefix marker. This matters in three contexts (there may be others):
- When borrowing code from Bitcoin public/private key cryptography. This will likely output public keys with a 02/03 prefix (compressed) or 04 (uncompressed), which needs to be removed.
- Conversion of a public key, to bech32. The pure x-coordinate value without prefix must be used as the input, not a compressed public key.
- Verification. The calculation of BOTH y-coordinate possibilities from the supplied x-coordinate is required, in order to check the signature against both versions of full public keys(x,y) - only one y-coordinate will be valid when verification passes.
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