Struct bdk_chain::bitcoin::blockdata::witness::Witness

pub struct Witness { /* private fields */ }
Expand description

The Witness is the data used to unlock bitcoin since the segwit upgrade.

Can be logically seen as an array of bytestrings, i.e. Vec<Vec<u8>>, and it is serialized on the wire in that format. You can convert between this type and Vec<Vec<u8>> by using Witness::from_slice and Witness::to_vec.

For serialization and deserialization performance it is stored internally as a single Vec, saving some allocations.

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impl Witness

pub const fn new() -> Witness

Creates a new empty Witness.

pub fn p2wpkh(signature: &Signature, pubkey: &PublicKey) -> Witness

Creates a witness required to spend a P2WPKH output.

The witness will be made up of the DER encoded signature + sighash_type followed by the serialized public key. Also useful for spending a P2SH-P2WPKH output.

It is expected that pubkey is related to the secret key used to create signature.

pub fn p2tr_key_spend(signature: &Signature) -> Witness

Creates a witness required to do a key path spend of a P2TR output.

pub fn from_slice<T>(slice: &[T]) -> Witness
where T: AsRef<[u8]>,

Creates a Witness object from a slice of bytes slices where each slice is a witness item.

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

Convenience method to create an array of byte-arrays from this witness.

pub fn is_empty(&self) -> bool

Returns true if the witness contains no element.

pub fn iter(&self) -> Iter<'_>

Returns a struct implementing Iterator.

pub fn len(&self) -> usize

Returns the number of elements this witness holds.

pub fn size(&self) -> usize

Returns the number of bytes this witness contributes to a transactions total size.

pub fn clear(&mut self)

Clear the witness.

pub fn push<T>(&mut self, new_element: T)
where T: AsRef<[u8]>,

Push a new element on the witness, requires an allocation.

pub fn push_ecdsa_signature(&mut self, signature: &Signature)

Pushes, as a new element on the witness, an ECDSA signature.

Pushes the DER encoded signature + sighash_type, requires an allocation.

pub fn last(&self) -> Option<&[u8]>

Returns the last element in the witness, if any.

pub fn second_to_last(&self) -> Option<&[u8]>

Returns the second-to-last element in the witness, if any.

pub fn nth(&self, index: usize) -> Option<&[u8]>

Return the nth element in the witness, if any

pub fn tapscript(&self) -> Option<&Script>

Get Tapscript following BIP341 rules regarding accounting for an annex.

This does not guarantee that this represents a P2TR Witness. It merely gets the second to last or third to last element depending on the first byte of the last element being equal to 0x50. See Script::is_p2tr to check whether this is actually a Taproot witness.

pub fn taproot_control_block(&self) -> Option<&[u8]>

Get the taproot control block following BIP341 rules.

This does not guarantee that this represents a P2TR Witness. It merely gets the last or second to last element depending on the first byte of the last element being equal to 0x50. See Script::is_p2tr to check whether this is actually a Taproot witness.

pub fn taproot_annex(&self) -> Option<&[u8]>

Get the taproot annex following BIP341 rules.

This does not guarantee that this represents a P2TR Witness. See Script::is_p2tr to check whether this is actually a Taproot witness.

pub fn witness_script(&self) -> Option<&Script>

Get the p2wsh witness script following BIP141 rules.

This does not guarantee that this represents a P2WS Witness. See Script::is_p2wsh to check whether this is actually a P2WSH witness.

Trait Implementations§

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impl Clone for Witness

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fn clone(&self) -> Witness

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
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impl Debug for Witness

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

Formats the value using the given formatter. Read more
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impl Decodable for Witness

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fn consensus_decode<R>(r: &mut R) -> Result<Witness, Error>
where R: Read + ?Sized,

Decode an object with a well-defined format. Read more
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fn consensus_decode_from_finite_reader<R>(reader: &mut R) -> Result<Self, Error>
where R: Read + ?Sized,

Decode Self from a size-limited reader. Read more
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impl Default for Witness

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fn default() -> Witness

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for Witness

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fn deserialize<D>( deserializer: D ) -> Result<Witness, <D as Deserializer<'de>>::Error>
where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Encodable for Witness

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fn consensus_encode<W>(&self, w: &mut W) -> Result<usize, Error>
where W: Write + ?Sized,

Encodes an object with a well-defined format. Read more
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impl From<&[&[u8]]> for Witness

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fn from(slice: &[&[u8]]) -> Witness

Converts to this type from the input type.
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impl From<&[Vec<u8>]> for Witness

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fn from(slice: &[Vec<u8>]) -> Witness

Converts to this type from the input type.
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impl From<Vec<&[u8]>> for Witness

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fn from(vec: Vec<&[u8]>) -> Witness

Converts to this type from the input type.
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impl From<Vec<Vec<u8>>> for Witness

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fn from(vec: Vec<Vec<u8>>) -> Witness

Converts to this type from the input type.
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impl Hash for Witness

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Index<usize> for Witness

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type Output = [u8]

The returned type after indexing.
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fn index(&self, index: usize) -> &<Witness as Index<usize>>::Output

Performs the indexing (container[index]) operation. Read more
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impl<'a> IntoIterator for &'a Witness

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type IntoIter = Iter<'a>

Which kind of iterator are we turning this into?
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type Item = &'a [u8]

The type of the elements being iterated over.
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fn into_iter(self) -> <&'a Witness as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl Ord for Witness

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

This method returns an Ordering between self and other. Read more
1.21.0 · source§

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

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for Witness

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for Witness

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Serialize for Witness

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fn serialize<S>( &self, serializer: S ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Eq for Witness

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impl StructuralPartialEq for Witness

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,