Structure

P256K.Signing.XonlyKey

The 32-byte x-only form of a secp256k1 P256K.Signing.PublicKey, as defined by BIP-340: the X coordinate of the public key point with implicit even-Y parity unless parity is true.

iOS 13.0+
macCatalyst 13.0+
macOS 10.15+
tvOS 13.0+
visionOS 1.0+
watchOS 6.0+

struct XonlyKey

Mentioned In

Working with Keys

Overview

Conversion uses secp256k1_xonly_pubkey_from_pubkey (declared in Vendor/secp256k1/include/secp256k1_extrakeys.h), which flips the sign of the point when its Y coordinate is odd and records the original parity so callers can reconstruct the full point later. Useful when pivoting from ECDSA-era verification into BIP-340 / Taproot workflows without regenerating the key material.

Topics

Inspection

var bytes: [UInt8]
The 32-byte X coordinate of this x-only public key.
var parity: Bool
The Y-coordinate parity of the underlying secp256k1 public key, as returned by secp256k1_xonly_pubkey_from_pubkey.

Construction

init<D>(dataRepresentation: D, keyParity: Int32)
Creates a P256K.Signing.XonlyKey from a 32-byte X-coordinate and its Y-coordinate parity.