📋 External API Specifications

2.4 🔄 Data Flow Specification

This section provides detailed specifications for transaction data flow through OTCM Protocol's five-nine-layer architecture. Understanding this flow is essential for developers integrating with the protocol and auditors verifying Category 1 compliance implementation.implementation.

🔹

2.4.1 📊 Transaction Lifecycle

Every ST22 Tokenized Securitiestoken transaction follows a deterministic lifecycle from user initiation through settlement and post-transaction monitoring—with Category 1 compliance verified at each stage:

┌─────────────────────────────────────────────────────────────────┐
│  📍 PHASE 1: INITIATION (0-50ms)                                │
│     User signs transaction → Submitted to RPC                   │
└─────────────────────────────────────────────────────────────────┘
                              ↓
┌─────────────────────────────────────────────────────────────────┐
│  ⚖️ PHASE 2: COMPLIANCE VERIFICATION (750-1,350ms)              │
│     All 6 Transfer Hooks execute sequentially                   │
│     42 security controls verified                               │
│     Category 1 requirements confirmed                           │
└─────────────────────────────────────────────────────────────────┘
                              ↓
              ┌───────────────┴───────────────┐
              ↓                               ↓
┌─────────────────────┐         ┌─────────────────────┐
│  ✅ ALL CHECKS PASS  │         │  ❌ ANY CHECK FAILS  │
│  Continue to Phase 3│         │  Transaction Reverts │
└─────────────────────┘         │  (Investor Protected)│
              ↓                 └─────────────────────┘
┌─────────────────────────────────────────────────────────────────┐
│  💹 PHASE 3: EXECUTION (400-600ms)                              │
│     Swap executes atomically on CEDEX                           │
│     Token balances updated                                      │
└─────────────────────────────────────────────────────────────────┘
                              ↓
┌─────────────────────────────────────────────────────────────────┐
│  ✅ PHASE 4: SETTLEMENT (~13 seconds)                           │
│     32-block confirmation via Tower BFT                         │
│     Securities settlement finality achieved                     │
└─────────────────────────────────────────────────────────────────┘
                              ↓
┌─────────────────────────────────────────────────────────────────┐
│  👁️ PHASE 5: POST-TRANSACTION MONITORING (Ongoing)              │
│     Pattern analysis, SAR evaluation, regulatory reporting      │
└─────────────────────────────────────────────────────────────────┘

2.4.2 📋 Five-Phase Processing Model

📍 Phase 1: Initiation (0-50ms)

Transaction initiation begins when a user submits an ST22 transfer through the CEDEX interface:monitoring:

// Transaction initiationLifecycle withDiagram
Category 1 compliance metadata
interface ST22TransferRequest {
    // Token identification
    tokenMint: PublicKey;        // ST22 token mint address
    amount: bigint;              // Transfer amount
    
    // Parties
    sender: PublicKey;           // Source wallet
    recipient: PublicKey;        // Destination wallet
    
    // Category 1 compliance data
    complianceMetadata: {
        kycVerified: boolean;    // Investor verification status
        accreditationStatus: AccreditationLevel;
        jurisdictionCode: string;
    };
    
    // Execution parameters
    slippageTolerance: number;   // Maximum acceptable slippage
    deadline: Date;              // Transaction expiration
}

⚖️ Phase 2: Verification (750-1,350ms)

The verification phase executes all six Transfer Hooks sequentially. Each hook:

• 🔍 Queries its designated oracle or data source
• ⚙️ Performs verification logic against compliance rules
• 📝 Records verification result in compliance log
• ✅ Returns PASS to continue or ❌ ERROR to revert

🛡️ Category 1 Guarantee: If ANY hook fails, the ENTIRE transaction reverts atomically. Non-compliant transfers cannot execute, even partially.

💹 Phase 3: Execution (400-600ms)

Upon successful verification, transaction execution proceeds atomically:

// Atomic swap execution (only reached after all compliance checks pass)
pub fn execute_verified_swap(
    ctx: Context<SwapContext>,
    amount_in: u64,
    minimum_out: u64,
) -> Result<()> {
    // Transfer Hooks have already verified:
    // ✅ Custody backing (1:1 ratio confirmed)
    // ✅ OFAC compliance (neither party sanctioned)
    // ✅ AML risk score (within acceptable range)
    // ✅ KYC/accreditation (investor verified)
    // ✅ Price impact (within 2% TWAP limit)
    // ✅ Liquidity ratio (above 150% minimum)
    
    // Execute atomic swap
    let swap_result = pool.execute_swap(amount_in, minimum_out)?;
    
    // Emit compliance event for audit trail
    emit!(ComplianceVerifiedSwap {
        token_mint: ctx.accounts.token_mint.key(),
        sender: ctx.accounts.sender.key(),
        recipient: ctx.accounts.recipient.key(),
        amount: amount_in,
        compliance_timestamp: Clock::get()?.unix_timestamp,
        category1_verified: true,
    });
    
    Ok(())
}

✅ Phase 4: Settlement (~13 seconds)

Settlement occurs through Solana's Tower BFT consensus mechanism. After 32 block confirmations, the transaction achieves practical finality with cryptographic guarantees against reversal—securities settlement complete.

👁️ Phase 5: Post-Transaction Monitoring (Ongoing)

Post-transaction monitoring implements continuous compliance oversight:

2.4.3 ⚠️ Error Handling & Recovery

OTCM implements comprehensive error handling with specific error codes enabling rapid diagnosis:

✅ Investor Protection: Every error represents a compliance control working as designed—protecting investors from non-compliant transactions.

2.5 🔌 System Integration Architecture

OTCM Protocol integrates with multiple external systems to deliver comprehensive Category 1 compliant securities trading functionality. This section documents API specifications, authentication protocols, and data exchange formats.

2.5.1 🏛️ Empire Stock Transfer Integration

The Empire Stock Transfer integration provides the custody verification foundation for all ST22 Tokenized Securities operations—satisfying the Category 1 regulated custody requirement:

// Empire Stock Transfer Integration Service
class EmpireStockIntegration {
    private readonly apiKey: string;
    private readonly baseUrl: string = 'https://api.empirestock.com/v2';
    
    // Verify custody balance (Category 1: True Equity Backing)
    async verifyCustodyBalance(
        cusip: string,
        expectedTokenSupply: bigint
    ): Promise<CustodyVerificationResult> {
        const response = await this.signedRequest('/custody/verify', {
            cusip,
            expectedSupply: expectedTokenSupply.toString(),
            verificationType: 'CATEGORY_1_BACKING'
        });
        
        return {
            verified: response.shareCount >= expectedTokenSupply,
            shareCount: BigInt(response.shareCount),
            lastAuditDate: new Date(response.lastAudit),
            transferAgentAttestation: response.signedAttestation,
            category1Compliant: response.category1Status === 'COMPLIANT'
        };
    }
    
    // Process redemption (token → Series M shares)
    async processRedemption(
        request: RedemptionRequest
    ): Promise<RedemptionResult> {
        // Verify KYC completion (required for redemption)
        await this.verifyKycStatus(request.investorId);
        
        // Initiate share transfer
        return this.signedRequest('/redemption/initiate', {
            cusip: request.cusip,
            shareCount: request.tokenAmount,
            recipientDrsAccount: request.drsAccount,
            category1Verification: true
        });
    }
}

2.5.2 🔮 Compliance Oracle Network

🚫 OFAC Screening API:

// OFAC Screening Request
POST /compliance/ofac/screen
{
    "addresses": [
        "7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU",
        "Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS"
    ],
    "screeningLevel": "ENHANCED",
    "category1Compliance": true
}

// OFAC Screening Response
{
    "results": [
        {
            "address": "7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU",
            "status": "CLEAR",
            "confidenceScore": 0.99,
            "lastUpdated": "2026-01-29T10:30:00Z"
        },
        {
            "address": "Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS",
            "status": "FLAGGED",
            "matchType": "SDN_PARTIAL_NAME",
            "confidenceScore": 0.72,
            "requiresReview": true
        }
    ],
    "category1Verification": "COMPLETE"
}

2.5.3 📋 External API Specifications

2.6 ⚡ Performance Engineering

OTCM Protocol's performance engineering balances Category 1 compliance verification requirements with user experience expectations. This section documents throughput optimization strategies, latency management approaches, and scalability architecture.

2.6.1 📊 Throughput Optimization

While Solana theoretically supports 65,000+ TPS, OTCM's compliance verification overhead reduces effective throughput to 400-600 TPS. This remains substantially higher than required for securities trading while ensuring every transaction passes Category 1 compliance checks.

Throughput Analysis:

💡 Design Philosophy: We prioritize compliance certainty over raw throughput. 400-600 TPS with guaranteed investor protection is superior to 65,000 TPS without compliance verification.

2.6.2 ⏱️ Latency Management

End-to-end latency for a typical CEDEX trade:

2.6.3 📈 Scalability Architecture

OTCM's scalability strategy leverages Solana's Sealevel parallel execution for horizontal scaling of non-conflicting transactions:

2.7 🔒 Security Architecture

OTCM implements a defense-in-depth security model with multiple overlapping protection layers. This approach ensures that compromise of any single security control does not result in system-wide vulnerability—essential for Category 1 investor protection.

2.7.1 🛡️ Defense-in-Depth Model

2.7.2 🔐 Cryptographic Standards

OTCM employs industry-standard cryptographic primitives:

2.7.3 🎯 Attack Surface Analysis

The following attack vectors have been analyzed and mitigated—protecting Category 1 investors:

2.8 🌐 Deployment Topology

OTCM Protocol deploys across multiple regions with redundant infrastructure ensuring high availability for Category 1 compliant securities trading:

┌─────────────────────────────────────────────────────────────────────────────┐
│                     🌐ST22 GLOBALTRANSACTION DEPLOYMENTLIFECYCLE                           │
└──────────────────────────────────────────────────────────────────────────┘

User Action Phase 1: INITIATION (0-50ms)

│                 • Parameter validation
│                 • Wallet signature
▼                 • RPC submission
┌────────┐
│ Submit │──────────► Gulf Stream forwards to leader validator
└────────┘
│
▼              Phase 2: VERIFICATION (750-1,350ms)
┌────────────────────────────────────────────────────────────┐
│  TRANSFER HOOKS EXECUTION (Sequential)                     │
│  Hook 1: Custody ──► Hook 2: OFAC ──► Hook 3: AML          │
│  Hook 4: KYC ──► Hook 5: Circuit Breaker ──► Hook 6: LP    │
└────────────────────────────────────────────────────────────┘
│
├─── FAIL ───► Atomic Revert + Error Code
│
▼ PASS        Phase 3: EXECUTION (400-600ms)
┌────────────────────────────────────────────────────────────┐
│  • CPMM calculation         • Fee deduction (5%)           │
│  • Reserve update           • Token transfer               │
│  • Event emission           • State commitment             │
└────────────────────────────────────────────────────────────┘
│
▼              Phase 4: SETTLEMENT (~13 seconds)
┌────────────────────────────────────────────────────────────┐
│  • Block confirmation       • Tower BFT voting             │
│  • 32-block finality        • Compliance recording         │
│  • Fee distribution         • Audit trail creation         │
└────────────────────────────────────────────────────────────┘
│
▼              Phase 5: MONITORING (Ongoing)
┌────────────────────────────────────────────────────────────┐
│  • Pattern analysis         • SAR evaluation               │
│  • Regulatory reporting     • Anomaly detection            │
└────────────────────────────────────────────────────────────┘

🔹 2.4.2 Nine-Layer Transaction Processing Model

Phase 1: Initiation (0-50ms)

Transaction initiation begins when a user submits an ST22 transfer through the CEDEX interface:

// Transaction Parameters (TypeScript)

interface TransactionParams {

tokenMint: PublicKey; // ST22 token address

amount: u64; // Transfer amount in base units

maxPrice: u64; // Slippage protection (0 = market)

recipientWallet: PublicKey; // Destination wallet

deadline: i64; // Unix timestamp expiry

}

Phase 2: Verification (750-1,350ms)

The verification phase executes all six Transfer Hooks sequentially. Each hook:

• Queries its designated oracle or data source
• Performs verification logic against compliance rules
• Records verification result in compliance log
• Returns PASS to continue or ERROR to revert Phase 3: Execution (400-600ms)

Upon successful verification, transaction execution proceeds atomically:

// Swap Execution (Rust/Anchor)
fn execute_swap(ctx: Context<Swap>, params: SwapParams) -> Result<()> {
// Calculate output using CPMM formula
let output = calculate_cpmm_output(

params.input_amount,

ctx.accounts.pool.sol_reserve,

ctx.accounts.pool.token_reserve,

)?;

// Apply 5% protocol fee
let fee = output * 500 / 10000;  // 5% = 500 basis points
let net_output = output - fee;
// Atomic state updates

ctx.accounts.pool.sol_reserve += params.input_amount;

ctx.accounts.pool.token_reserve -= output;

// Transfer tokens to recipient

transfer_tokens(ctx.accounts.recipient, net_output)?;

// Distribute fees

distribute_fees(fee, &ctx.accounts.fee_recipients)?;

emit!(SwapExecuted { ... });
Ok(())

}

Phase 4: Settlement (~13 seconds)

Settlement occurs through Solana's Tower BFT consensus mechanism. After 32 block confirmations, the transaction achieves practical finality with cryptographic guarantees against reversal.

Phase 5: Post-Transaction Monitoring (Ongoing)

Post-transaction monitoring implements continuous compliance oversight:

• Real-time pattern analysis: Machine learning models analyze transaction patterns for suspicious activity
• Flagging queue: Transactions meeting review thresholds enter compliance team queue
• SAR evaluation: Suspicious Activity Report filing determination for flagged transactions
• Regulatory reporting: Automated generation of required regulatory filings

🔹 2.4.3 Error Handling & Recovery

OTCM implements comprehensive error handling with specific error codes enabling rapid diagnosis:

2.5 System Integration Architecture

OTCM Protocol integrates with multiple external systems to deliver comprehensive securities trading functionality. This section documents API specifications, authentication protocols, and data exchange formats.

🔌 2.5 External System Integration

🔹 2.5.1 Empire Stock Transfer Integration

The Empire Stock Transfer integration provides the custody verification foundation for all ST22 token operations:

// Empire Stock Transfer API
// Custody Oracle API Specification

interface CustodyOracleResponse {

issuer_cik: string; // SEC CIK number

cusip: string; // CUSIP identifier

share_class: 'SERIES_M'; // Always Series M

custodied_balance: u64; // Verified share count

last_verification: i64; // Unix timestamp

attestation_signature: string; // Ed25519 signature

audit_hash: string; // SHA-256 of audit data

}

// API Endpoint

GET https://api.empirestocktransfer.com/v1/custody/{issuer_cik}

Authorization: Bearer {api_key}

X-Oracle-Signature: {signature}

🔹 2.5.2 Compliance Oracle Network

OFAC Screening API:

// OFAC Screening API
// OFAC Screening Request

POST https://oracle.otcm.io/v1/ofac/screen

{

"wallet_address": "7xKXt...",

"transaction_type": "transfer",

"counterparty": "9yMPs..."

}

// Response

{

"status": "CLEAR" | "MATCH" | "PARTIAL_MATCH",

"sdn_match_confidence": 0.0 - 1.0,

"last_list_update": "2025-12-22T00:00:00Z",

"verification_id": "uuid"

}

🔹 2.5.3 External API Specifications

⚡ 2.6 Performance Engineering

OTCM Protocol's performance engineering balances compliance verification requirements with user experience expectations. This section documents throughput optimization strategies, latency management approaches, and scalability architecture.

🔹 2.6.1 Throughput Optimization

While Solana theoretically supports 65,000+ TPS, OTCM's compliance verification overhead reduces effective throughput to 400-600 TPS. This remains substantially higher than required for securities trading while ensuring every transaction passes compliance checks.

Throughput Analysis:

🔹 2.6.2 Latency Management

End-to-end latency for a typical CEDEX trade:

🔹 2.6.3 Scalability Architecture

OTCM's scalability strategy leverages Solana's Sealevel parallel execution for horizontal scaling of non-conflicting transactions:

• Token Pair Isolation: Trades in different ST22 tokens execute in parallel (no account overlap)
• Oracle Caching: Compliance oracle results cached for 1 block (~400ms) to reduce redundant queries
• Batch Processing: Off-chain systems aggregate compliance data for efficient on-chain verification
• Geographic Distribution: Multi-region RPC deployment minimizes network latency globally

🏗️ 2.7 Security Architecture

OTCM implements a defense-in-depth security model with multiple overlapping protection layers. This approach ensures that compromise of any single security control does not result in system-wide vulnerability.

🔹 2.7.1 Defense-in-Depth Model

🔹 2.7.2 Cryptographic Standards

OTCM employs industry-standard cryptographic primitives:

• Key Derivation: Ed25519 for Solana wallet signatures (128-bit security equivalent)
• Hashing: SHA-256 for transaction verification, Blake3 for high-performance hashing
• Encryption: AES-256-GCM for data at rest, TLS 1.3 for data in transit
• Oracle Signatures: Ed25519 signatures on all oracle attestations for non-repudiation

🔹 2.7.3 Attack Surface Analysis

The following attack vectors have been analyzed and mitigated:

MEV/Frontrunning: Jito bundle integration routes transactions through validator bundles that resist frontrunning. Circuit breakers (2% TWAP deviation) limit profitability of sandwich attacks.

Oracle Manipulation: Multi-oracle architecture requires consensus across Empire Stock Transfer, OFAC, and blockchain analytics sources. Single oracle compromise cannot affect transaction verification.

Rug Pull Attempts: Permanent liquidity locks enforced by smart contract make liquidity withdrawal mathematically impossible. Override requires 2/3 DAO supermajority plus 48-hour timelock.

Smart Contract Exploits: Formal verification using Certora, security audits by Quantstamp and Halborn, active bug bounty program with up to $100K rewards.

🚀 2.8 Deployment Topology

OTCM Protocol deploys across multiple regions with redundant infrastructure ensuring high availability:

// Global Deployment Architecture
┌─────────────────────────────────────────────────────────────────────────┐
│                    OTCM DEPLOYMENT TOPOLOGY                             │
└─────────────────────────────────────────────────────────────────────────┘
┌───────────────┐       ┌───────────────┐
│   US-EAST     │       │   US-WEST     │
│   (Primary)   │◄─────►│   (Secondary) │
└───────┬───────┘       └───────┬───────┘
│                       │
└───────────┬───────────┘
│
┌───────────┴───────────┐
│  GLOBAL LOAD BALANCER │
└───────────┬───────────┘
│
┌─────────────────┐    ┌──────┼───────────────────────┐
│                       🇺🇸 US-EAST    │                       │
🇺🇸┌──────┴──────┐         US-WEST┌──────┴──────┐         ┌──────┴──────┐
│    │   🇪🇺  EU-WEST    │         │  Primary RegionAPAC       │         │  Secondary Region│    │ Secondary Region│
├─────────────────┤    ├─────────────────┤    ├─────────────────┤
│ • Helius RPCLATAM      │
│  •(DR Helius RPCSite)  │         │  • Helius RPC(Edge)     │         │  • CEDEX API     │    │ • CEDEX API     │    │ • CEDEX API     │
│ • Oracle Nodes  │    │ • Oracle Nodes  │    │ • Oracle Nodes  │
│ • Empire Stock  │←──→│ • Failover      │←──→│ • Failover      │
│   Integration   │    │   Cluster       │    │   Cluster(Edge)     │
└─────────────────┘         └─────────────────┘         └─────────────────┘
         ↓                      ↓                      ↓
┌─────────────────────────────────────────────────────────────────────────────┐
│                    ☀️ SOLANA MAINNET (GLOBAL)                               │
│              Settlement Layer for ST22 Tokenized Securities                 │
│                    (Category 1 Compliant Infrastructure)                    │
└─────────────────────────────────────────────────────────────────────────────┘