Struct PushDrop 

pub struct PushDrop {
    pub fields: Vec<Vec<u8>>,
    pub private_key: Option<PrivateKey>,
    pub sighash_type: u32,
}

PushDrop script template for embedding data with spending control.

Creates a locking script that pushes data fields onto the stack, drops them with OP_DROP operations, then verifies a signature against a public key (OP_CHECKSIG).

Fields

fields: Vec<Vec<u8>>

Data fields to embed in the script.

private_key: Option<PrivateKey>

Private key for signing (used for both lock pubkey and unlock signature).

sighash_type: u32

Sighash scope for signing (default: SIGHASH_ALL | SIGHASH_FORKID).

Implementations

impl PushDrop

pub fn new(fields: Vec<Vec<u8>>, key: PrivateKey) -> Self

Create a PushDrop template with data fields and a key for locking and unlocking.

The private key’s public key will be used in the locking script, and the private key will be used for signing in the unlocking script.

pub fn lock_only(fields: Vec<Vec<u8>>) -> Self

Create a PushDrop template for locking only (no signing capability).

Requires knowing the public key bytes to embed in the script. Use new() instead if you also need unlock capability.

pub fn unlock(&self, preimage: &[u8]) -> Result<UnlockingScript, ScriptError>

Create an unlocking script from a sighash preimage.

Produces: <signature_DER + sighash_byte>

pub fn estimate_unlock_length(&self) -> usize

Estimate the byte length of the unlocking script.

PushDrop unlock is just a signature: approximately 74 bytes (1 push opcode + up to 72 DER sig bytes + 1 sighash byte).

pub fn decode(script: &LockingScript) -> Result<PushDrop, ScriptError>

Decode a PushDrop locking script, recovering the embedded data fields.

Parses the script pattern: <field_1> <field_2> ... <field_N> OP_DROP|OP_2DROP... <pubkey> OP_CHECKSIG

Returns a PushDrop with the extracted fields, no private key, and default sighash.

Trait Implementations

impl Clone for PushDrop

fn clone(&self) -> PushDrop

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PushDrop

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

Formats the value using the given formatter.

impl ScriptTemplateLock for PushDrop

fn lock(&self) -> Result<LockingScript, ScriptError>

Create a PushDrop locking script.

Structure: <field_1> <field_2> ... <field_N> OP_DROP|OP_2DROP... <pubkey> OP_CHECKSIG

Each field is pushed as data, then removed with OP_DROP (or OP_2DROP for pairs). The final element on stack will be verified against the embedded public key via OP_CHECKSIG.

impl ScriptTemplateUnlock for PushDrop

fn sign(&self, preimage: &[u8]) -> Result<UnlockingScript, ScriptError>

Sign a transaction input and produce an unlocking script.

fn estimate_length(&self) -> Result<usize, ScriptError>

Estimate the byte length of the unlocking script (for fee calculation).