Crate causeway_sapling 

Causeway off-chain helpers for Zcash Sapling shielded assets.

Sapling addresses are 43 bytes raw (11-byte diversifier ‖ 32-byte pk_d) wrapped in a network-specific bech32 envelope:

• zs1… — mainnet
• ztestsapling1… — testnet
• zregtestsapling1… — regtest

This crate ships pure parse/encode helpers. Building / signing the actual Sapling spend (PCZT, Groth16, FROST) lives entirely in the coordinator daemon and is opaque to SDK consumers — a tenant program or off-chain caller passes a recipient z-address through the on-chain request_signing flow and the coordinator handles the rest.

No coordinator gRPC client is included by design: this crate is the off-chain mirror of the Sapling address-derivation surface, same as causeway-zec is for transparent ZEC. Coordinator-driving belongs in tenant-specific code, not in the per-asset SDK crates.

Example

use causeway_sapling::{decode_sapling_address, encode_sapling_address, Network};

let z = "zregtestsapling1euldd485nn489mlc9qs7g0vt9em845mfzehcp8sverxtwczhyuwhu8jzexhk8z6w4xt2wld40jr";
let parsed = decode_sapling_address(z).unwrap();
assert_eq!(parsed.network, Network::Regtest);
assert_eq!(parsed.raw.len(), 43);
let round_trip = encode_sapling_address(parsed.network, &parsed.raw).unwrap();
assert_eq!(round_trip, z);

Re-exports

pub use address::decode_sapling_address;

pub use address::encode_sapling_address;

pub use address::Network;

pub use address::SaplingAddress;

pub use address::SaplingError;

Modules

address

Sapling payment-address bech32 parse + encode.