diff --git a/nip44/nip44.go b/nip44/nip44.go
deleted file mode 100644
index 5032c8a..0000000
--- a/nip44/nip44.go
+++ /dev/null
@@ -1,93 +0,0 @@
-package nip44
-
-import (
-	"crypto/rand"
-	"crypto/sha256"
-	"encoding/base64"
-	"encoding/hex"
-	"fmt"
-
-	"github.com/btcsuite/btcd/btcec/v2"
-	"golang.org/x/crypto/chacha20"
-)
-
-// ComputeSharedSecret returns a shared secret key used to encrypt messages.
-// The private and public keys should be hex encoded.
-// Uses the Diffie-Hellman key exchange (ECDH) (RFC 4753).
-func ComputeSharedSecret(pub string, sk string) ([]byte, error) {
-	privKeyBytes, err := hex.DecodeString(sk)
-	if err != nil {
-		return nil, fmt.Errorf("error decoding sender private key: %w", err)
-	}
-	privKey, _ := btcec.PrivKeyFromBytes(privKeyBytes)
-
-	// adding 02 to signal that this is a compressed public key (33 bytes)
-	pubKeyBytes, err := hex.DecodeString("02" + pub)
-	if err != nil {
-		return nil, fmt.Errorf("error decoding hex string of receiver public key '%s': %w", "02"+pub, err)
-	}
-	pubKey, err := btcec.ParsePubKey(pubKeyBytes)
-	if err != nil {
-		return nil, fmt.Errorf("error parsing receiver public key '%s': %w", "02"+pub, err)
-	}
-
-	sharedSecret := btcec.GenerateSharedSecret(privKey, pubKey)
-	hash := sha256.Sum256(sharedSecret)
-	return hash[:], nil
-}
-
-// Encrypt encrypts message with key using xchacha20.
-// key should be the shared secret generated by ComputeSharedSecret.
-// Returns: base64(1 + nonce + encrypted_bytes).
-func Encrypt(message string, key []byte) (string, error) {
-	nonce := make([]byte, 24)
-	if _, err := rand.Read(nonce); err != nil {
-		return "", fmt.Errorf("error creating nonce: %w", err)
-	}
-
-	return encryptWithNonce(message, key, nonce)
-}
-
-func encryptWithNonce(message string, key []byte, nonce []byte) (string, error) {
-	cipher, err := chacha20.NewUnauthenticatedCipher(key, nonce)
-	if err != nil {
-		return "", fmt.Errorf("error creating cipher: %w", err)
-	}
-
-	msg := []byte(message)
-	cipher.XORKeyStream(msg, msg)
-
-	payload := make([]byte, 1+24+len(msg))
-	payload[0] = 1
-	copy(payload[1:25], nonce)
-	copy(payload[25:], msg)
-
-	return base64.StdEncoding.EncodeToString(payload), nil
-}
-
-// Decrypt decrypts a content string using the shared secret key.
-// The inverse operation to message -> Encrypt(message, key).
-func Decrypt(payload string, key []byte) (string, error) {
-	data, err := base64.StdEncoding.DecodeString(payload)
-	if err != nil {
-		return "", fmt.Errorf("invalid base64: %w", err)
-	}
-
-	if data[0] != 1 {
-		return "", fmt.Errorf("unknown version: %d", data[0])
-	}
-	if len(data) <= 25 {
-		return "", fmt.Errorf("invalid payload, too small: %d", len(data))
-	}
-
-	nonce := data[1:25]
-	msg := data[25:]
-	cipher, err := chacha20.NewUnauthenticatedCipher(key, nonce)
-	if err != nil {
-		return "", fmt.Errorf("error creating cipher: %w", err)
-	}
-
-	cipher.XORKeyStream(msg, msg)
-
-	return string(msg), nil
-}