NUMSPublicKey class

A "nothing up my sleeve" ECPublicKey that is created from a point with no known private key and tweaked with a scalar value named rTweak. The key is reproduceable from this scalar using fromRTweak(). Any of these keys have no known associted private key. Sharing the rTweak allows others to verify this. These keys can be used as Taproot internal keys where no key-path spending is desired.

Inheritance

• Object
• ECPublicKey
• NUMSPublicKey

Constructors

NUMSPublicKey.fromRTweak(Uint8List rTweak)

Constructs a NUMS key from a given rTweak. Throws ArgumentError if rTweak cannot produce a valid public key.

factory

NUMSPublicKey.generate()

Generates a new NUMS key with a random rTweak.

factory

Properties

compressed → bool

no setter, inherited

data → Uint8List

no setter, inherited

hashCode → int

The hash code for this object.

no setter, inherited

hex → String

no setter, inherited

rTweak → Uint8List

The scalar tweak for this key which may be shared for verification.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

x → Uint8List

Obtains the X coordinate of the public key which is used for Schnorr signatures. Schnorr signatures force an even Y coordinate. Public and private keys are converted to use even Y coordinates as necessary allowing any existing keys to work.

no setter, inherited

xonly → ECPublicKey

Obtains a new key that uses the same X coordinate but uses an even Y coordinate.

no setter, inherited

yIsEven → bool

True if the Y-coordinate is even as required for Schnorr signatures. If the Y-coorindate is not even, then the odd equivilent can be obtained via xonly.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

tweak(Uint8List scalar) → ECPublicKey?

Tweaks the public key with a scalar multiplied by the generator point. In the instance a new key cannot be created (practically impossible for random 32-bit scalars), then null will be returned.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Properties

numsPoint → ECPublicKey

To prove that this point does not have an associated private key, the x-coordinate is the sha256 hash of the uncompressed secp256k1 generator point bytes. This can be reproduced and verified using the script bin/generate_nums_point.dart.

final