i just need the first, and it's not specific to nip-44, it's a standard pub/priv ECDH just that it's X only

i will amend my version so i have access to it

i already determined that one-shot sender secrets can get 8mb/s throughput on the btcec library, if the math is much the same as the signatures then it's gonna be 32mb/s possible throughput on a noise-protocol style of symmetric encryption (just to repeat, that is with generating a new secret to send with, and deriving the ECDH shared secret to use with whatever (i was using AES-CTR at the time because i was using the schnorr signature of the one-time generated secret as the HMAC)