hopper-memo

Hopper-owned CPI helper for the SPL Memo program.

The SPL Memo program (MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr) records arbitrary UTF-8 byte payloads in transaction logs and asserts that a list of accounts have signed. It is the canonical primitive for on-chain metadata stamping, orderbook IDs, off-chain reference numbers, audit notes, and arbitrary protocol tags without spinning up program-owned state.

Quick start

use hopper_memo::Memo;

Memo {
    signers: &[user.account_view()],
    memo: b"order=42",
}
.invoke()?;

For PDA-signed memos, pass the seed list to invoke_signed:

Memo {
    signers: &[vault_pda.account_view()],
    memo: b"deposit",
}
.invoke_signed(&[Signer::from(&[b"vault", &[bump]][..])])?;

Programs

Memo defaults to v2; pass program_id: Some(&hopper_memo::v1::MEMO_V1_PROGRAM_ID) to invoke v1.

Compatibility

Pinocchio parity: pinocchio-memo. Quasar omits a memo helper.

Docs: https://docs.rs/crate/hopper-memo/0.1.0

License: Apache-2.0.