> For the complete documentation index, see [llms.txt](https://triple-plus-global.gitbook.io/tpt-whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://triple-plus-global.gitbook.io/tpt-whitepaper/trust-and-security/smart-contract-security.md).

# Smart Contract Security

## Audit Program

All smart contracts undergo rigorous security review:

| Phase                   | Description                               |
| ----------------------- | ----------------------------------------- |
| **Internal Review**     | Team code review and testing              |
| **Third-Party Audit**   | Independent security firm audit           |
| **Formal Verification** | Mathematical proof for critical functions |

***

## Audit Status

| Contract  | Auditor | Status   | Report                                                              |
| --------- | ------- | -------- | ------------------------------------------------------------------- |
| TPT Token | CertiK  | Finished | [\[Link\]](https://skynet.certik.com/projects/tpt-global#pulseFeed) |

{% hint style="warning" %}
Audit reports will be linked here upon completion.
{% endhint %}

***

## Contract Architecture

{% @mermaid/diagram content="flowchart TB
subgraph Core\["Core Contracts"]
ESC\["Escrow"]
SET\["Settlement"]
REG\["Registry"]
end

```
subgraph Access["Access Control"]
    STAKE["Staking"]
    KYC["KYC/KYB"]
end

subgraph Assets["Asset Contracts"]
    INV["Invoice NFT"]
    PO["PO NFT"]
end

Access --> Core
Assets --> Core" %}
```

### Core Contracts

| Contract       | Function                                   |
| -------------- | ------------------------------------------ |
| **Escrow**     | Holds funds and assets during transactions |
| **Settlement** | Processes payments and distributions       |
| **Registry**   | Tracks all assets and their status         |

### Access Control

| Contract    | Function                             |
| ----------- | ------------------------------------ |
| **Staking** | Manages TPT staking and tiers        |
| **KYC/KYB** | Verifies participant identity status |

### Asset Contracts

| Contract        | Function                                |
| --------------- | --------------------------------------- |
| **Invoice NFT** | Tokenized invoice representation        |
| **PO NFT**      | Tokenized purchase order representation |

***

## Upgrade Mechanism

Contracts use a transparent proxy pattern:

| Feature                | Description                        |
| ---------------------- | ---------------------------------- |
| **Multi-sig Approval** | Upgrades require 3-of-5 signatures |
| **Time-lock Delay**    | 48-hour delay on all upgrades      |
| **Emergency Pause**    | Immediate halt for critical issues |
| **Transparency**       | All upgrades announced in advance  |

### Upgrade Process

{% stepper %}
{% step %}

### Proposal submitted by team

The team submits an upgrade proposal to the governance/upgrade process.
{% endstep %}

{% step %}

### Multi-sig approval (3-of-5)

The proposal requires approval from at least 3 of the 5 designated multi-sig signers.
{% endstep %}

{% step %}

### 48-hour time-lock begins

Once approved, a 48-hour time-lock starts before execution is allowed.
{% endstep %}

{% step %}

### Community notified

The community is notified about the pending upgrade during the time-lock period.
{% endstep %}

{% step %}

### Upgrade executed after time-lock

After the time-lock elapses (and assuming no intervention), the upgrade is executed.
{% endstep %}
{% endstepper %}

##