Struct ControlBlock

pub struct ControlBlock {
    pub leaf_version: LeafVersion,
    pub output_key_parity: Parity,
    pub internal_key: UntweakedPublicKey,
    pub merkle_branch: TaprootMerkleBranch,
}

Control Block data structure used in Tapscript satisfaction

Fields

leaf_version: LeafVersion

The tapleaf version,

output_key_parity: Parity

The parity of the output key (NOT THE INTERNAL KEY WHICH IS ALWAYS XONLY)

internal_key: UntweakedPublicKey

The internal key

merkle_branch: TaprootMerkleBranch

The merkle proof of a script associated with this leaf

Implementations

impl ControlBlock

pub fn from_slice(sl: &[u8]) -> Result<ControlBlock, TaprootError>

Obtain a ControlBlock from slice. This is an extra witness element that provides the proof that taproot script pubkey is correctly computed with some specified leaf hash. This is the last element in taproot witness when spending a output via script path.

Errors:

• If the control block size is not of the form 33 + 32m where 0 <= m <= 128, InvalidControlBlock is returned

pub fn size(&self) -> usize

Obtain the size of control block. Faster and more efficient than calling serialize() followed by len(). Can be handy for fee estimation

pub fn encode<Write: Write>(&self, writer: Write) -> Result<usize>

Serialize to a writer. Returns the number of bytes written

pub fn serialize(&self) -> Vec<u8>

Serialize the control block. This would be required when using ControlBlock as a witness element while spending an output via script path. This serialization does not include the VarInt prefix that would be applied when encoding this element as a witness.

pub fn verify_taproot_commitment<C: Verification>( &self, secp: &Secp256k1<C>, output_key: &TweakedPublicKey, script: &Script, ) -> bool

Verify that a control block is correct proof for a given output key and script This only checks that script is contained inside the taptree described by output key, full verification must also execute the script with witness data

Trait Implementations

impl Clone for ControlBlock

fn clone(&self) -> ControlBlock

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ControlBlock

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Deserialize for ControlBlock

fn deserialize(bytes: &[u8]) -> Result<Self, Error>

Deserialize a value from raw data.

impl Hash for ControlBlock

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for ControlBlock

fn cmp(&self, other: &ControlBlock) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for ControlBlock

fn eq(&self, other: &ControlBlock) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for ControlBlock

fn partial_cmp(&self, other: &ControlBlock) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for ControlBlock

fn serialize(&self) -> Vec<u8>

Serialize a value as raw data.

impl Eq for ControlBlock

impl StructuralPartialEq for ControlBlock