> For the complete documentation index, see [llms.txt](https://plabs.gitbook.io/plabs-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://plabs.gitbook.io/plabs-docs/appendix/glossary.md).

# Glossary

## Modules

| Term                | Definition                                                       |
| ------------------- | ---------------------------------------------------------------- |
| **Privacy Core**    | Cryptographic layer + **asset protocols** (pERC20, Shield ERC20) |
| **Applications**    | Operations on privacy assets: pSWAP, pDEX, pX402                 |
| **OrchardVerifier** | On-chain Privacy Core state machine                              |

## Privacy Core

| Term               | Definition                                             |
| ------------------ | ------------------------------------------------------ |
| **Note**           | Shielded value unit (commitment + encrypted plaintext) |
| **cmx**            | Note commitment (Merkle leaf)                          |
| **Nullifier (nf)** | Spend tag preventing double-spend                      |
| **Action**         | One spend/create step + Groth16 proof                  |
| **PrivacyCall**    | On-chain payload: `actions` + `bindingSig`             |
| **cmxFrozenRoot**  | Compliance freeze IMT root                             |
| **bindingSig**     | Bundle-level value-conservation Schnorr                |
| **spendAuthSig**   | Per-action anti-tamper Schnorr                         |

## pERC20

| Term           | Definition                                                                                                                                  |
| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
| **pERC20**     | Native private fungible token asset protocol (Privacy Core)                                                                                 |
| **PERC20**     | Reference contract name                                                                                                                     |
| **perc1**      | Privacy recipient address — bech32m string, prefix `perc1` (EVM assets), e.g. `perc1q…`; decodes to 43-byte raw (`d[11] ‖ pk_d`) for prover |
| **Subaccount** | ZIP-32 per-spender account (approve)                                                                                                        |

## Shield ERC20

| Term             | Definition                                   |
| ---------------- | -------------------------------------------- |
| **Shield ERC20** | Public ERC-20 → private notes asset protocol |

## pSWAP

| Term                  | Definition                                                                             |
| --------------------- | -------------------------------------------------------------------------------------- |
| **pSWAP**             | Private atomic swap: coordinator registers legs, `settle` runs dual `IPERC20.transfer` |
| **SwapCoordinator**   | Application contract: `initiateSwap` / `joinSwap` / `settle`                           |
| **htlcHash**          | One-time `keccak256(preimage)` per swap; only preimage holder can `settle`             |
| **preimage**          | Secret `S` revealed at settle; binds LP leg to user leg (HTLC hashlink)                |
| **commitA / commitB** | `keccak256(abi.encode(PrivacyCall))` per leg; register vs settle integrity             |

## pDEX

| Term     | Definition                                             |
| -------- | ------------------------------------------------------ |
| **pDEX** | Private decentralized exchange & routing (coming soon) |

## pX402

| Term      | Definition                                   |
| --------- | -------------------------------------------- |
| **pX402** | Private HTTP 402 micropayments (coming soon) |


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