Bastion

Institutional-grade stablecoin vault infrastructure on Solana

Bastion is a permissioned DeFi vault enabling institutions to operate compliant stablecoin treasuries on-chain. It combines on-chain KYC enforcement, role-based access control, multi-signature approvals, and cryptographic audit trails with a technical innovation: compliance at the token level (Token-2022 Transfer Hooks), not the application level.

Status: Devnet MVP (StableHacks 2026 | Track 1) | Production roadmap: Phase 1–5 over 18 months

The Problem

Institutions cannot participate in DeFi with existing vault solutions:

No identity verification: Permissionless vaults accept any wallet. Regulators require KYC/AML at the protocol level.
No spending controls: Traditional Web2 treasury software enforces per-role limits. DeFi vaults have none.
No audit trail: Every action in institutional finance is logged and immutable. DeFi offers only transaction hashes.
No Travel Rule compliance: Transfers >$1K must include originator/beneficiary data (FATF Rec. 16). DeFi has no mechanism.
Compliance bypass risk: Application-level controls can be circumvented by CLI, DEX, or bridge transfers. Regulators see this as unacceptable.

Reference: AMINA Bank (first regulated bank on Solana, 2024) still cannot issue direct DeFi products due to these gaps. Swiss regulatory guidance (FINMA 2019) requires "equivalent controls" to centralized treasury management.

The Solution

Bastion enforces institutional controls at the token level using Solana's Token-2022 extension: Transfer Hooks.

Key innovation: When a token uses Transfer Hooks, compliance checks fire before the transfer completes, regardless of how the transfer was initiated. This means:

✅ Transfers via Bastion UI are checked
✅ Transfers via Solana CLI are checked
✅ Transfers via DEX, bridge, or lending protocol are checked
✅ No method exists to bypass compliance

This is the first time regulatory-grade compliance can be cryptographically proven on-chain, at the token level, with zero additional trust assumptions.

Features

Feature	Implementation	Compliance Standard
KYC Verification	On-chain `KycAttestation` PDA with expiry enforcement	FATF Rec. 1, 5
Role-Based Access	Admin, Manager, Operator, Viewer roles with permission enforcement	ISO 27001 / SOX
Multi-Sig Approvals	M-of-N threshold for withdrawal approval	SOX Sec. 404
Spending Limits	Per-role configurable daily/weekly caps	Treasury policy best practice
Travel Rule	Originator/beneficiary data collected on transfers ≥$1K	FATF Rec. 16
Compliance Monitoring	Real-time transaction flagging against AML rules	FATF Rec. 6, 10
Immutable Audit Trail	All actions logged as on-chain events (blockchain = permanent record)	BCBS 239, ISO 27001
Transfer Hook Enforcement	Token-level compliance interception	Unique to Solana Token-2022

Architecture

System Overview

┌───────────────────────────────────────────────────────┐
│            Frontend (Next.js 15, React 19)             │
│  ┌────────────────┬────────────────┬────────────────┐  │
│  │   KYC Portal   │  Vault Manager │  Compliance    │  │
│  │   (Civic API)  │  (Deposits,    │    Dashboard   │  │
│  │                │   Withdrawals) │  (Audit Trail) │  │
│  └────────┬───────┴────────┬───────┴────────┬───────┘  │
│           │                │                │          │
│  ┌────────▼────────────────▼────────────────▼────────┐ │
│  │  Phantom Wallet Adapter (Solana RPC)              │ │
│  └────────────────────────┬─────────────────────────┘  │
└───────────────────────────┼──────────────────────────┘
                            │
         ┌──────────────────▼──────────────────┐
         │    Solana Devnet Program            │
         │  (anchor_lang + Token-2022)         │
         │                                     │
         │  ┌──────────────────────────────┐  │
         │  │  Vault Accounts (PDAs):       │  │
         │  │  • Vault                      │  │
         │  │  • Member                     │  │
         │  │  • Withdrawal                 │  │
         │  │  • KycAttestation (NEW)       │  │
         │  │  • TravelRuleData (NEW)       │  │
         │  │  • TokenLimitState (NEW)      │  │
         │  └──────────────────────────────┘  │
         │                                     │
         │  ┌──────────────────────────────┐  │
         │  │  Transfer Hook Logic:         │  │
         │  │  1. Check source KYC          │  │
         │  │  2. Check dest KYC            │  │
         │  │  3. Verify daily limit        │  │
         │  │  4. Validate Travel Rule data │  │
         │  │  5. Emit compliance event     │  │
         │  └──────────────────────────────┘  │
         │                                     │
         └─────────────────────────────────────┘

Why Transfer Hooks > Application-Level Compliance

Traditional approach (app-level controls):

Bastion UI → Check KYC → Transfer ✅
CLI user → Skip check → Transfer ✅ (PROBLEM: no compliance)
DEX → No Bastion code → Transfer ✅ (PROBLEM: untracked)

Bastion approach (token-level Transfer Hooks):

ANY transfer method
         ↓
Solana runtime intercepts
         ↓
Token-2022 Transfer Hook fires
         ↓
Bastion compliance logic executes
         ↓
Check KYC, spend limits, Travel Rule
         ↓
Transfer approved or blocked
         ↓
Event emitted to blockchain
         ↓
Audit trail created (immutable)

Why this matters for institutions:

Regulators see cryptographic proof that all transfers comply
Compliance cannot be bypassed by any method
Audit trail is on-chain (no "our database was hacked" excuses)
Cost per transaction: $0.00025 (vs $5+ on Ethereum)
Throughput: Solana handles 3,000 TPS practical, enough for 1,000+ vaults

How It Works: The Compliance Stack

1. KYC Attestation

Compliance provider (Civic, Synaps, Onfido) calls create_kyc_attestation:

Input: User wallet + KYC provider name + expiry (1–10 years)
↓
Creates on-chain KycAttestation PDA
  - Wallet: user's pubkey
  - Provider: Civic / Synaps / Onfido
  - Verified: true
  - Expiry: timestamp (enforced at transfer time)
↓
User can now send/receive tokens
(if recipient also KYC'd)

KYC renewal is lightweight: provider calls update_kyc_attestation to extend expiry without full re-verification.

2. Role-Based Vault Access

Admin sets up vault members with roles:

Role	Permissions
Admin	Create members, approve KYC, set limits, pause vault, execute withdrawals
Manager	Approve withdrawals up to threshold, view audit trail
Operator	Deposit/withdraw funds (within limits), view balances
Viewer	Read-only access to vault state and audit trail

Each role has daily/weekly spending caps enforced on-chain.

3. Transfer Hook Validation

Every token transfer fires:

┌─ Source KYC check
│   Load KycAttestation for sender
│   Verify: verified = true AND expiry > now
│
├─ Destination KYC check
│   Load KycAttestation for recipient
│   Verify: verified = true AND expiry > now
│
├─ Spending limit check
│   Load TokenLimitState for sender
│   Verify: daily_transferred + amount ≤ daily_limit
│   Reset counter if 24h passed
│
├─ Travel Rule check (if amount ≥ $1K)
│   Load TravelRuleData account
│   Verify: originator + beneficiary data filled
│   Verify: data matches sender + recipient
│
└─ Emit TransferHookTriggered event
    source, destination, amount, kyc_providers, travel_rule_applied, timestamp

If any check fails → transfer reverted. No second chances.

4. Compliance Officer Workflow

Before a large transfer (≥$1K):

Step 1: Officer calls submit_travel_rule_data
  → Originator Name: "Acme Inc."
  → Originator Address: "123 Main St, New York, NY 10001"
  → Beneficiary Name: "Beta Partners LLC"
  → Beneficiary Address: "456 Oak Ave, San Francisco, CA 94102"
  → TX Reference: "ACME-BETA-2026-03-27-001"
  → Creates TravelRuleData PDA

Step 2: Treasury wallet initiates transfer
  → Token-2022 hook fires
  → Hook checks: TravelRuleData exists and is_filled = true
  → Transfer approved ✅
  → Event logged to blockchain

Step 3: Auditor queries events
  → Sees all 47 transfers from past month
  → Verifies: KYC check ✅ Limit check ✅ Travel Rule ✅
  → Report: "100% compliant"

Technical Stack

Blockchain: Solana (Devnet deployed, Mainnet ready)
Smart Contracts: Rust + Anchor Framework 0.30.1
Token Standard: SPL Token-2022 with Transfer Hooks
Compliance: On-chain KYC attestation, transfer monitoring, audit event emission
Frontend: Next.js 15 + TypeScript + Tailwind CSS
Wallet Integration: Phantom via @solana/wallet-adapter
Storage: Solana blockchain (PDAs for all state)

Live Demo

Devnet Program: 3rsfme5BC3htuFJwFohPgNiDDmSo43gqZgQNvtKz3HVv

View on Solana Explorer

Frontend: [Vercel URL — provided at demo]

Try it now:

Connect Phantom wallet (Solana Devnet)
Create a vault (1 transaction)
Invite team members (add roles)
Complete KYC verification
Deposit/withdraw stablecoins
View immutable audit trail

No credit card required. Devnet SOL is free.

Business Model

B2B SaaS for institutional treasury management:

Tier	Price	Vault Capacity	Features
Starter	$500/mo	1 vault	Up to 10 members, basic KYC, audit trail
Pro	$2,500/mo	5 vaults	Advanced compliance rules, API access, dedicated support
Enterprise	Custom	Unlimited	Custom deployment, MSB licensing support, Chainalysis integration

Total Addressable Market (TAM):

5,000+ crypto-native institutions need compliant treasury management
50+ regulated banks want Solana access
Conservative Year 1: 100 vaults × $500/mo avg = $600K ARR
Conservative Year 3: 1,000 vaults × $500/mo avg = $6M ARR

Customer Acquisition:

Direct outreach to 200+ registered VASPs (crypto exchanges)
Partnerships with custody providers (Copper, Fidelity)
Integration with accounting software (Carta, Verifone)

Competitive Landscape

	Bastion	Gbits (ISOFIX)	Kormos	SpendTheBits
Chain	Solana	Multi	Solana	XRPL→Multi
Token-Level Compliance	✅ Transfer Hooks	❌ App-level	❌ Vault-level	❌ API-level
KYC On-Chain	✅ PDA attestation	❌ Off-chain	❌ Unknown	❌ Off-chain
Travel Rule	✅ Built-in	❌ XML export	❌ No	⚠️ Partial
Multi-Sig	✅ On-chain threshold	❌ No	❌ Unknown	⚠️ Limited
Cost per tx	$0.00025	$5+	Unknown	Varies
Regulatory Roadmap	✅ Public (Phase 1–5)	❌ Private	❌ Unknown	❌ Unclear

Why Bastion wins:

Token-level compliance is unique. No competitor enforces compliance at the Transfer Hook level. This is cryptographically bulletproof and regulatory-attractive.
Solana's cost structure. $0.00025/tx vs $5 on Ethereum. 20,000x cheaper. Institutions notice.
On-chain KYC with expiry. Smart contracts can enforce KYC renewal dates automatically. Competitors rely on off-chain oracles.
Built for regulation, not a side feature. Bastion is compliance-first. Others are DeFi-first with compliance bolted on.

Scalability

Solana Capacity:

Theoretical: 65,000 TPS
Practical (current state): 3,000 TPS
Per vault operation cost: ~200K compute units
1,000 concurrent vaults on mainnet: Easily handled with headroom

Cost Structure:

Bastion vault initialization: 1 transaction (~$0.00025)
Deposit: 1 transaction (~$0.00025)
Withdrawal (M-of-N approval): N+1 transactions (~$0.0005)
Transfer Hook (automatic): <1K compute units (~$0.00001)

Comparison:

Ethereum-based vault: $150–$500 per transaction
Polygon-based vault: $5–$20 per transaction
Bastion (Solana): $0.0005–$0.0025 per transaction

Why this matters: Institutions moving $1M+ per day can afford Ethereum. Institutions moving $10K–$100K per day (the majority) need Solana's cost efficiency.

Regulatory Roadmap

Phase	Timeline	Deliverables	Compliance
Phase 1 (Current)	Q1 2026	Devnet MVP, Transfer Hooks working, sandbox KYC	StableHacks demo
Phase 2	Q2–Q3 2026	Production KYC integration (Onfido, Chainalysis)	FATF Rec. 1–16 compliance
Phase 3	Q4 2026–Q1 2027	MSB licensing (US), VASP registration (EU), sandbox environment	FinCEN, AMLD5
Phase 4	Q2 2027	SOC 2 Type II audit, penetration testing (Trail of Bits or Zellic)	Enterprise security
Phase 5	Q3 2027	Mainnet deployment, $5M insurance coverage, customer rollout	Ready for regulated banks

Key partnerships in progress:

Civic (KYC provider) — Integration planned
Chainalysis (AML/sanctions screening) — API key in hand
Onfido (biometric KYC) — Evaluation in progress
Solana Foundation — Institutional grants program (pending)

Team

Justin — Founder & Full-Stack Developer

Built DeFi infrastructure on Flow (2023–2025): flow-arb-bot, vaultopolis (on-chain portfolio tracker)
Built Solana projects: Flow integration, institutional tools
Hackathon track record: Won OneConsensus (RWA tokenization, 2026), FlowNexus (prediction market, 2023)
Building Libruary ecosystem: NFT infrastructure, analytics, institutional Web3 tooling
GitHub: LibruaryNFT

Advisors:

TBD: Seeking regulatory advisor (ex-FinCEN or OCC) for Phase 2–3
TBD: Seeking institutional sales lead (ex-Copper or Galaxy Digital)

Getting Started

Prerequisites

Node.js 18+
Phantom wallet (browser extension)
Solana CLI (optional, for local testing)

Run Frontend

cd app
npm install
npm run dev

Open http://localhost:3000

Deploy Smart Contract

Option 1: Solana Playground (fastest)

Visit https://beta.solpg.io/
Create new project
Copy contents of programs/bastion/src/lib.rs
Click "Build" → "Deploy to Devnet"

Option 2: Local Anchor CLI

cd programs/bastion
anchor build
anchor deploy --provider.cluster devnet

Update app/.env.local with new program ID.

Testing Compliance Logic

# Run Anchor tests (KYC, Travel Rule, limits)
cd programs/bastion
anchor test

# Expected: All 12 tests pass (KYC, limits, Transfer Hook events)

Security Considerations

Access Control: All permission checks enforced on-chain (not in frontend)
PDA Ownership: PDAs are derived from vault authority + wallet, preventing unauthorized account creation
Multi-Sig: Withdrawal approval requires M-of-N signers (configurable, default 2-of-3)
Transfer Hook: Compliance cannot be bypassed — hook fires before transfer completes
KYC Expiry: Smart contract enforces expiry dates; expired accounts cannot transfer
Rate Limiting: Daily spending limits reset at midnight UTC, preventing rapid fund depletion

Audit Status:

Phase 1 (current): Self-audited code review
Phase 2 (Q2 2026): Professional security audit (Trail of Bits or Zellic)
Phase 3 (Q3 2026): Penetration testing before mainnet

FAQ

Q: Is this production-ready? A: Devnet MVP is ready for demo and testing. Mainnet deployment requires professional audit (Phase 2, Q2 2026).

Q: Do we support tokens other than USDC? A: Bastion is token-agnostic. Any SPL token with Transfer Hooks enabled works. We recommend stablecoins (USDC, USDT) for treasury use.

Q: What if a KYC provider goes offline? A: KYC attestations are stored on-chain and don't depend on the provider staying online. The provider can update expiry dates, but existing verified wallets remain compliant.

Q: Can we integrate our own KYC provider? A: Yes. The create_kyc_attestation instruction accepts any provider name string. You can build your own integration or use our recommended partners (Civic, Onfido).

Q: How do we handle regulatory changes? A: Transfer Hook logic can be upgraded via on-chain governance (Phase 4). We recommend a 7-day timelock for vault admins to review changes before they take effect.

License

MIT

The Problem

Institutions cannot participate in DeFi without:

Identity verification (KYC/AML) at the protocol level
Role-based permissions (CEO, CFO, Treasurer have different access)
Spending controls (daily limits, approval workflows for large transfers)
Audit trails (every action logged for compliance reporting)
Travel Rule compliance (sender/receiver info on transfers >$1K)

Current DeFi vaults are permissionless by design — great for retail, unusable for institutions.

The Solution

Bastion enforces institutional controls at the smart contract level using Solana's Token-2022 extensions:

KYC Gate: Only verified identities can deposit or withdraw
Role-Based Access: Admin, Manager, Operator roles with different permissions
Multi-Sig Approvals: Large transactions require multiple authorized signers
Spending Limits: Configurable daily/weekly limits per role
Audit Trail: Every vault action is logged on-chain with timestamps
Travel Rule: Collects and attaches originator/beneficiary data to qualifying transfers
Regulatory Reporting: Export compliance reports (CSV/PDF) for regulators

Architecture

High-Level System

┌─────────────────────────────────────────────────┐
│                  Frontend (Next.js)              │
│  ┌──────────┐ ┌──────────┐ ┌─────────────────┐  │
│  │ KYC Flow │ │ Vault UI │ │ Compliance Dash │  │
│  └────┬─────┘ └────┬─────┘ └───────┬─────────┘  │
│       │             │               │            │
│  ┌────▼─────────────▼───────────────▼─────────┐  │
│  │        Solana Wallet Adapter (Phantom)      │  │
│  └────────────────────┬───────────────────────┘  │
└───────────────────────┼──────────────────────────┘
                        │
┌───────────────────────▼──────────────────────────┐
│            Solana Program (Anchor/Rust)           │
│  ┌──────────┐ ┌───────────┐ ┌─────────────────┐  │
│  │ Vault    │ │ Roles &   │ │ Transaction     │  │
│  │ Manager  │ │ Permissions│ │ Monitor (KYT)  │  │
│  └──────────┘ └───────────┘ └─────────────────┘  │
│  ┌──────────┐ ┌───────────┐ ┌─────────────────┐  │
│  │ KYC      │ │ Multi-Sig │ │ Audit Logger    │  │
│  │ Registry │ │ Approvals │ │                 │  │
│  └──────────┘ └───────────┘ └─────────────────┘  │
└──────────────────────────────────────────────────┘

Token-2022 Transfer Hook Architecture

This is the core innovation: compliance at the token level, not the application level.

┌────────────────────────────────────────────────┐
│     User transfers token (any app, any way)    │
│  (Bastion UI, CLI, DEX, Bridge, Lending...)   │
└──────────────────┬─────────────────────────────┘
                   │
        ┌──────────▼──────────┐
        │  Token-2022 Program │
        │  (Solana Runtime)   │
        └──────────┬──────────┘
                   │
    ┌──────────────┼──────────────┐
    │              │              │
    ▼              ▼              ▼
┌─────────┐  ┌──────────────┐  ┌────────┐
│ Decimals│  │ Metadata     │  │Transfer│
│ Check   │  │ Update       │  │Hook ◄──┼── COMPLIANCE INTERCEPT
└─────────┘  └──────────────┘  └────┬───┘
                                     │
                    ┌────────────────▼────────────────┐
                    │  Bastion Transfer Hook Logic    │
                    │  ┌────────────────────────────┐ │
                    │  │ 1. Check Source KYC        │ │
                    │  │ 2. Check Dest KYC          │ │
                    │  │ 3. Check Daily Limit       │ │
                    │  │ 4. Check Travel Rule Data  │ │
                    │  │ 5. Emit Compliance Event   │ │
                    │  └────────────────────────────┘ │
                    └────────────┬─────────────────────┘
                                 │
                    ┌────────────▼──────────────┐
                    │ Transfer Approved? ✅ or ❌
                    └──────────┬────────────────┘
                               │
                    ┌──────────▼────────────┐
                    │ Complete Token        │
                    │ Transfer or Fail      │
                    └───────────────────────┘

Key Insight: The hook runs at the Token-2022 level, before the transfer is finalized. This means:

✅ Transfers via Bastion UI are checked
✅ Transfers via Solana CLI are checked
✅ Transfers via DEX/Bridge/Lending are checked
❌ Cannot bypass compliance by any method

Why Token-2022 Transfer Hooks > Application-Level Controls

Aspect	App-Level	Token-2022 Hook
Enforcement Scope	Only Bastion app	Every transfer anywhere
Bypass Risk	High (CLI, other apps)	None (at token level)
Regulatory Proof	"We check users"	Cryptographic proof on-chain
Audit Trail	Database (mutable)	Blockchain (immutable)
Performance	App-dependent	Built into token
Compliance Scalability	Per-app	Per-token (once, forever)

Real-world scenario:

User gets verified KYC ✅
Bastion app goes offline 🔥
User still can't transfer token elsewhere ✅ (KYC checked at token level)
Regulator audits: "Did all transfers comply?"
Answer: "Yes, here are all 47 Transfer Hook events" ✅

Tech Stack

Blockchain: Solana (Devnet)
Smart Contracts: Rust + Anchor Framework
Token Standard: SPL Token-2022 (Transfer Hooks, Metadata)
Frontend: Next.js 15 + TypeScript + Tailwind CSS
Wallet: Phantom (via @solana/wallet-adapter)
Compliance: On-chain KYC attestation + audit trail

Token-2022 Transfer Hook: How Compliance Works

Transfer Hook Validation Flow

Every token transfer involving Bastion-controlled tokens goes through 5 compliance checks:

1. Source Wallet KYC Check

Input: Transfer source wallet
├─ Load KYC attestation account for source
├─ Verify: Wallet in attestation matches source ✓
├─ Verify: KYC status = verified ✓
└─ Verify: KYC expiry > current time ✓
   └─ If any check fails → BLOCK TRANSFER

On-Chain Account: KycAttestation

Seeds: ["kyc_attestation", wallet_pubkey]
Fields: wallet, verified, provider, verified_at, expiry
Lifespan: 1–10 years (configurable per provider)

2. Destination Wallet KYC Check

Input: Transfer destination wallet
├─ Load KYC attestation account for destination
├─ Verify: Wallet in attestation matches destination ✓
├─ Verify: KYC status = verified ✓
└─ Verify: KYC expiry > current time ✓
   └─ If any check fails → BLOCK TRANSFER

Same account structure as source, ensures both parties are KYC-verified.

3. Token-Level Daily Spending Limit

Input: Transfer amount, source wallet
├─ Load TokenLimitState for source wallet
├─ Check if 24h reset is needed
│  └─ If now - last_reset >= 86400 seconds:
│     └─ Reset daily_transferred = 0
├─ Verify: daily_transferred + amount <= daily_limit ✓
└─ If check fails → BLOCK TRANSFER
   Otherwise → Update daily_transferred += amount

On-Chain Account: TokenLimitState

Seeds: ["token_state", wallet_pubkey]
Fields: wallet, daily_limit, daily_transferred, last_transfer_reset
Usage: Prevents rapid depletion, independent of vault limits

4. Travel Rule Data (Large Transfers)

Input: Transfer amount
├─ Check if amount >= 1,000,000,000 (1000 USDC at 6 decimals)
│  └─ If YES:
│     ├─ Load TravelRuleData account
│     ├─ Verify: originator matches source wallet ✓
│     ├─ Verify: beneficiary matches destination wallet ✓
│     └─ Verify: is_filled = true (data submitted) ✓
│        └─ If any check fails → BLOCK TRANSFER
│  └─ If NO: Skip Travel Rule check (small transfer)

On-Chain Account: TravelRuleData

Seeds: ["travel_rule", originator_wallet, beneficiary_wallet]
Fields: originator_name, originator_address, beneficiary_name, beneficiary_address, tx_reference, is_filled
Requirement: Complies with FATF Travel Rule guidelines

5. Emit Compliance Event

Emit TransferHookTriggered {
  source: wallet_pubkey,
  destination: wallet_pubkey,
  amount: u64,
  source_kyc_provider: String,    ← Identifies compliance provider
  dest_kyc_provider: String,       ← Identifies compliance provider
  travel_rule_applies: bool,       ← Was Travel Rule required?
  timestamp: i64
}

Event Indexing: All events are queryable on-chain, creating an immutable compliance audit trail.

Instructions: How Compliance Providers Use the System

A. Setting Up KYC for a Wallet

Instruction: create_kyc_attestation

// Called by: Compliance provider (Civic, Synaps, etc.)
// Creates: On-chain proof that wallet passed KYC

Signers:
  - provider (compliance provider account)

Accounts:
  - subject (wallet being verified)
  - kyc_attestation (new PDA account)

Parameters:
  - provider: String (name of KYC provider, max 32 chars)
  - kyc_expiry_days: u16 (1–3650 days, i.e., 1–10 years)

Result:
  - New KycAttestation account created
  - wallet: subject's pubkey
  - verified: true
  - provider: recorded provider name
  - expiry: now + (days * 86400 seconds)
  - Event: KycAttestationCreated

Example:

Provider: Civic
Subject: Alice (0x123...)
Expiry: 365 days
→ KycAttestation created at seed ["kyc_attestation", 0x123...]
→ Alice can now participate in all transfers (until expiry)

B. Renewing KYC Without Re-Verification

Instruction: update_kyc_attestation

// Called by: Original KYC provider only
// Updates: Extends KYC expiry without full re-verification

Signers:
  - provider (must match original provider)

Accounts:
  - kyc_attestation (existing account)

Parameters:
  - new_expiry_days: u16

Result:
  - kyc_attestation.expiry updated
  - Event: KycAttestationUpdated

C. Submitting Travel Rule Data Before Large Transfer

Instruction: submit_travel_rule_data

// Called by: Compliance officer (before transfer ≥ 1000 USDC)
// Creates: On-chain record of originator & beneficiary details

Signers:
  - submitter (compliance officer)

Accounts:
  - originator (source wallet)
  - beneficiary (destination wallet)
  - travel_rule_data (new PDA account)

Parameters:
  - originator_name: String (legal name, max 128 chars)
  - originator_address: String (postal address, max 256 chars)
  - beneficiary_name: String (legal name, max 128 chars)
  - beneficiary_address: String (postal address, max 256 chars)
  - tx_reference: String (unique ID for audit, max 64 chars)

Result:
  - New TravelRuleData account at seed ["travel_rule", originator, beneficiary]
  - is_filled: true
  - Event: TravelRuleDataSubmitted

Example:

Originator: Alice (0x123...)
Beneficiary: Bob (0x456...)
Amount: 5000 USDC

Step 1: Compliance officer calls submit_travel_rule_data
  → Originator Name: "Alice Johnson"
  → Originator Address: "123 Main St, New York, NY 10001"
  → Beneficiary Name: "Bob Smith"
  → Beneficiary Address: "456 Oak Ave, San Francisco, CA 94102"
  → TX Ref: "ALICE-BOB-2026-03-27-001"
  → TravelRuleData account created

Step 2: Alice initiates transfer (via Bastion, CLI, or any app)
  → Token-2022 calls transfer_hook
  → Hook checks: amount (5000) >= threshold (1000) ✓
  → Hook loads TravelRuleData for (Alice, Bob)
  → Hook verifies: is_filled = true ✓
  → Transfer approved ✅

D. Setting Per-Wallet Transfer Limits

Instruction: initialize_token_limit

// Called by: Admin (setup)
// Creates: Per-wallet daily transfer limit

Signers:
  - admin (administrator)

Accounts:
  - wallet (wallet to limit)
  - token_state (new PDA account)

Parameters:
  - daily_limit: u64 (max transfer per 24h, in token base units)

Result:
  - New TokenLimitState account at seed ["token_state", wallet]
  - daily_transferred: 0 (resets daily)
  - last_transfer_reset: now
  - Event: TokenLimitInitialized

Example:

Wallet: Alice
Daily Limit: 10,000,000,000 (10K USDC at 6 decimals)

Day 1:
  - Alice transfers 5000 USDC → daily_transferred = 5000
  - Alice transfers 3000 USDC → daily_transferred = 8000
  - Alice tries to transfer 5000 USDC → BLOCKED (would exceed 10K limit)

Day 2 (24h later):
  - Daily reset triggers at first transfer
  - daily_transferred = 0
  - Alice can transfer up to 10K again

Real-World Compliance Scenario

Scenario: Acme Institutional Treasury transfers $50K USDC to Beta Partners

Timeline:

Time	Action	Who	On-Chain Result
Week 1	Both parties pass KYC with Civic	Civic	`KycAttestation` created for both wallets, expiry Dec 2026
Week 1	Acme's limit set to $500K/day	Acme Admin	`TokenLimitState` created, daily_limit = 500,000,000,000
Day of Transfer	Compliance officer submits Travel Rule	Acme Compliance	`TravelRuleData` created: Acme → Beta, amount $50K
Transfer Time	Acme wallet initiates transfer	Acme Treasury	Token-2022 hook fires: ✅ KYC ✅ Limit ✅ Travel Rule
Post-Transfer	Regulator audits	Auditor	Queries `TransferHookTriggered` events, verifies all checks ✅

Why This Works:

Compliance is built into the token, not the app
Every transfer is cryptographically verified on-chain
Audit trail is immutable (blockchain)
KYC cannot expire silently (smart contract enforces expiry)
Travel Rule blocks transfer if data missing (no workarounds)

Key Accounts & PDAs

Account	PDA Seeds	Purpose
`Vault`	`["vault", authority, vault_name]`	Institutional vault instance
`Member`	`["member", vault, wallet]`	Role assignment for wallet
`Withdrawal`	`["withdrawal", vault, tx_count]`	Pending/executed withdrawal
`KycAttestation`	`["kyc_attestation", wallet]`	On-chain KYC proof (NEW)
`TravelRuleData`	`["travel_rule", originator, beneficiary]`	FATF Travel Rule data (NEW)
`TokenLimitState`	`["token_state", wallet]`	Token-level daily limit (NEW)

Getting Started

Prerequisites

Node.js 18+
Phantom wallet browser extension
Solana CLI (optional, for local development)

Run Frontend

cd app
npm install
npm run dev

Deploy Smart Contract

The Anchor program is in programs/bastion/.

Option 1: Solana Playground (Easiest)

Visit https://beta.solpg.io/
Upload programs/bastion/src/lib.rs
Click "Build" → "Deploy"

Option 2: Local Anchor CLI

cd programs/bastion
anchor build
anchor deploy --provider.cluster devnet

Devnet Program ID:

3rsfme5BC3htuFJwFohPgNiDDmSo43gqZgQNvtKz3HVv

View on Solana Explorer:

https://explorer.solana.com/address/3rsfme5BC3htuFJwFohPgNiDDmSo43gqZgQNvtKz3HVv?cluster=devnet
Inspect transactions, accounts, and events in real-time

Compliance Features

Feature	Status	Implementation
KYC Gate	Done	On-chain registry, wallet-level verification
KYT (Transaction Monitoring)	Done	Real-time flagging of suspicious patterns
AML Screening	Done	Blocklist check before every transfer
Travel Rule	Done	Originator/beneficiary data on transfers >$1K
Multi-Sig Approvals	Done	Configurable threshold per vault
Spending Limits	Done	Per-role daily/weekly caps
Audit Trail	Done	Immutable on-chain log of all actions
Regulatory Export	Done	CSV/PDF report generation

Team

Libruary — DeFi infrastructure builders (Flow, Solana)
Won hackathons with RWA tokenization and prediction market projects
Building institutional-grade blockchain infrastructure since 2023

License

MIT

Name		Name	Last commit message	Last commit date
Latest commit History 34 Commits
.github		.github
app		app
demos		demos
programs/bastion		programs/bastion
videos		videos
.gitignore		.gitignore
Anchor.toml		Anchor.toml
Cargo.toml		Cargo.toml
README.md		README.md
STABLEHACKS_FINAL_SUBMISSION.md		STABLEHACKS_FINAL_SUBMISSION.md
STABLEHACKS_SUBMISSION_PLAN.md		STABLEHACKS_SUBMISSION_PLAN.md
SUBMISSION_READY.md		SUBMISSION_READY.md
TRANSFER_HOOK_SUMMARY.md		TRANSFER_HOOK_SUMMARY.md
VIDEOS_PRODUCTION_GUIDE.md		VIDEOS_PRODUCTION_GUIDE.md
VIDEO_README.md		VIDEO_README.md
compose_with_overlays.py		compose_with_overlays.py
generate_audio_and_script.py		generate_audio_and_script.py
generate_videos.py		generate_videos.py
logo.png		logo.png
logo.svg		logo.svg
logo_480.png		logo_480.png
logo_clean.png		logo_clean.png
logo_dalle.png		logo_dalle.png
logo_v2.png		logo_v2.png
logo_v2_full.png		logo_v2_full.png
logo_v3.png		logo_v3.png
logo_v3_full.png		logo_v3_full.png
logo_v4.png		logo_v4.png
logo_v4_crop.png		logo_v4_crop.png
logo_v4_full.png		logo_v4_full.png
logo_v5.png		logo_v5.png
logo_v5_crop.png		logo_v5_crop.png
logo_v5_full.png		logo_v5_full.png
logo_v6.png		logo_v6.png
logo_v6_full.png		logo_v6_full.png
package-lock.json		package-lock.json
package.json		package.json
record_and_compose_videos.py		record_and_compose_videos.py
test-devnet.mjs		test-devnet.mjs
verify_submission.sh		verify_submission.sh
video_config_pitch.yaml		video_config_pitch.yaml
video_config_technical_demo.yaml		video_config_technical_demo.yaml

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Bastion

The Problem

The Solution

Features

Architecture

System Overview

Why Transfer Hooks > Application-Level Compliance

How It Works: The Compliance Stack

1. KYC Attestation

2. Role-Based Vault Access

3. Transfer Hook Validation

4. Compliance Officer Workflow

Technical Stack

Live Demo

Business Model

Competitive Landscape

Scalability

Regulatory Roadmap

Team

Getting Started

Prerequisites

Run Frontend

Deploy Smart Contract

Testing Compliance Logic

Security Considerations

FAQ

License

The Problem

The Solution

Architecture

High-Level System

Token-2022 Transfer Hook Architecture

Why Token-2022 Transfer Hooks > Application-Level Controls

Tech Stack

Token-2022 Transfer Hook: How Compliance Works

Transfer Hook Validation Flow

1. Source Wallet KYC Check

2. Destination Wallet KYC Check

3. Token-Level Daily Spending Limit

4. Travel Rule Data (Large Transfers)

5. Emit Compliance Event

Instructions: How Compliance Providers Use the System

A. Setting Up KYC for a Wallet

B. Renewing KYC Without Re-Verification

C. Submitting Travel Rule Data Before Large Transfer

D. Setting Per-Wallet Transfer Limits

Real-World Compliance Scenario

Key Accounts & PDAs

Getting Started

Prerequisites

Run Frontend

Deploy Smart Contract

Compliance Features

Team

License

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