Function cltv_script 

pub fn cltv_script(locktime: u32, pubkey_hash: &[u8; 20]) -> Vec<u8> 

Build a CLTV (CheckLockTimeVerify, BIP-65) timelock script.

Script: <locktime> OP_CLTV OP_DROP <pubkey_hash> OP_CHECKSIG

The output can only be spent after the specified block height or time.

Arguments

• locktime — Block height (< 500_000_000) or Unix timestamp
• pubkey_hash — 20-byte HASH160 of the recipient’s public key