Crate hopper_memo 

Hopper-owned SPL Memo program builder.

The SPL Memo program records arbitrary UTF-8 byte payloads in transaction logs and asserts that a list of accounts signed the containing transaction. It is the canonical primitive for on-chain metadata stamping (off-chain reference numbers, orderbook IDs, arbitrary protocol tags) without spinning up program-owned state.

Programs

• MEMO_PROGRAM_ID - Memo v2, the default and overwhelming majority case.
• v1::MEMO_V1_PROGRAM_ID - legacy Memo v1, kept available for protocols still pinned to the original program. New code should prefer Memo v2.

Quick start

use hopper_memo::Memo;

Memo {
    signers: &[user_view],
    memo: b"order=42",
    program_id: None,
}
.invoke()?;

Memo strings can be empty; the program enforces only the signer constraints. The memo body is passed verbatim as the instruction data. UTF-8 framing is the caller’s responsibility.

Modules

v1

Legacy SPL Memo v1 helpers.

Structs

Memo

SPL Memo CPI builder.

Constants

MAX_MEMO_SIGNERS

Maximum signer accounts a single memo invocation may cite.

MEMO_PROGRAM_ID

SPL Memo v2 program id: MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr.