Technical Architecture

Seven-Layer Infrastructure Stack

graph TB
    subgraph App["Application Layer"]
        A1[Creation Platforms]
        A2[Custom Production]
        A3[Social Networks]
        A4[Logistics Tracking]
    end
    subgraph Svc["Service Layer"]
        B1[AI Contribution Assessment]
        B2[Multi-Value Judging]
        B3[Identity & Reputation]
        B4[Oracle Aggregation]
    end
    subgraph Proto["Protocol Layer"]
        C1[Key Coin Contracts]
        C2[PoG Proof-of-Generation]
        C3[Governance Contracts]
        C4[Conversion Contracts]
    end
    subgraph Net["Network Layer"]
        D1[DHT Overlay]
        D2[MerkleDAG Storage]
        D3[DePIN Compute]
        D4[Swarm Messaging]
    end
    subgraph Phys["Physical Layer"]
        E1[Clean Energy Nodes]
        E2[Smart Meters]
        E3[Automated Factories]
        E4[Autonomous Delivery]
    end
    App --> Svc --> Proto --> Net --> Phys

Proof-of-Generation (PoG)

Unlike PoW/PoS traditional mining. Generation is proof.

graph TD
    A[Generation Node Report] --> B{Oracle Cross-Verification}
    B --> C[Oracle A]
    B --> D[Oracle B]
    B --> E[Oracle C]
    C --> F{Deviation ≤ 5%?}
    D --> F
    E --> F
    F -->|No| G[Slash Staked KEY]
    F -->|Yes| H[Mint PoG-NFT]
    H --> I[Record: kWh / Timestamp / Geolocation / AI Output]

• ≥3 independent Oracles cross-verify
• Deviation > 5%: slashing of staked Key Coin
• Upon verification: PoG-NFT minted, recording kWh, timestamp, geolocation, AI output

AI Contribution Assessment

Core Formula:

$V^t = \sum_{i} w_i \times (e_i^t \times c_i^t)$

90-99% Approval Mechanism

Multi-round voting → proposal iteration → converging toward consensus. Eliminates 51% tyranny-of-the-majority.

graph LR
    A[Round 1 Vote] --> B{≥ 90%?}
    B -->|Yes| C[✅ Passed]
    B -->|No| D[3-Day Interval]
    D --> E[Opponents Submit Amendments]
    E --> F[Round 2 Vote]
    F --> G{≥ 90%?}
    G -->|Yes| C
    G -->|No| H[Continue Iteration]
    H --> E

Contract Architecture

Post-Quantum Cryptography (PQC) Technical Architecture

Key Coin solemnly commits: complete network-wide PQC migration before quantum computers pose a material threat to ECDSA. This commitment is irrevocable and enshrined in the QuantumMigrationCommitment contract.

Threat Model

Quantum computers threaten blockchains from three directions:

Shor's Algorithm — The Asymmetric Crypto Terminator

Shor's algorithm breaks the mathematical foundations of RSA and ECDSA in polynomial time. Ethereum's secp256k1 curve is defenseless against a sufficiently fault-tolerant quantum computer.

$N = p \times q \quad\rightarrow\quad f(x) = a^x \bmod N \quad\rightarrow\quad \text{QFT finds period } r \quad\rightarrow\quad p,q = \gcd(a^{r/2} \pm 1, N)$

Grover's Algorithm — The Symmetric Crypto Weakening

Grover's algorithm reduces brute-force search complexity from $O(N)$ to $O(\sqrt{N})$. Keccak-256's preimage resistance drops from 256-bit to 128-bit. Countermeasure: extend hash output to 384-bit or use SHAKE-256 directly.

HNDL (Harvest Now, Decrypt Later) — The Most Urgent Threat

Attackers intercept and store encrypted transaction data today, decrypting it once quantum computers mature. Even if quantum computers are 5-10 years away, data requiring long-term confidentiality is already at risk.

NIST Standardization Landscape

NIST launched the global PQC algorithm competition in 2016. On August 13, 2024, the first three FIPS standards were officially published:

In March 2025, NIST selected the code-based algorithm HQC for additional KEM standardization, achieving a "lattice + code + hash" triangulation.

Global Migration Timeline Consensus

Algorithm Families

graph TB
    subgraph Math["Mathematical Foundations"]
        A[Lattice-based]
        B[Code-based]
        C[Hash-based]
    end
    subgraph KEM["Key Encapsulation KEM"]
        D[ML-KEM / Kyber<br/>FIPS 203]
        E[HQC<br/>NIST Round 4]
    end
    subgraph SIG["Digital Signatures"]
        F[ML-DSA / Dilithium<br/>FIPS 204]
        G[FN-DSA / Falcon<br/>Candidate]
        H[SLH-DSA / SPHINCS+<br/>FIPS 205]
    end
    A --> D
    A --> F
    A --> G
    B --> E
    C --> H

Lattice-Based — The Workhorse

Security relies on SVP (Shortest Vector Problem) and CVP (Closest Vector Problem) in high-dimensional lattices, both NP-hard.

ML-KEM (Kyber) — Key Encapsulation

Built on the Module-LWE problem. Intuition: given many "noisy" linear equations $A \cdot s + e = b$, recovering the secret vector $s$ from $b$ is hard in both classical and quantum settings.

Process:

1. Key Generation: random matrix $A$ + small secret vector $s$ → public key $(A, t = A \cdot s + e)$
2. Encapsulation: encrypt with $r$ → ciphertext $(u, v)$ → derive shared key
3. Decapsulation: recover shared key from ciphertext using $s$ (leverages bounded error correction)

Performance benchmark: 6000 encapsulations/sec, 3500 key pairs/sec.

ML-DSA (Dilithium) — Digital Signature

Adopts the Fiat-Shamir with Aborts paradigm. If the response vector $z$ coefficient is too large during signing, "abort" and retry, preventing secret vector distribution leakage.

Key feature: supports batch signature verification — in "single key + multiple messages" scenarios, 20%-50% faster than per-message verification.

Performance benchmark: 1000 signatures/sec, 3000 verifications/sec.

Hash-Based — The Conservative Backup

SLH-DSA (SPHINCS+) depends only on hash function collision resistance, making it the most conservative security assumption.

Structure: WOTS+ one-time signatures → Merkle Tree aggregation → Hypertree multi-layer nesting.

Trade-off: signature size 8-50 KB (vs ECDSA's 64 bytes, Dilithium's ~2.4 KB), signing speed 1-2 orders of magnitude slower. Used only as backup in high-frequency TLS handshakes.

Code-Based — Diversity Assurance

HQC is based on the syndrome decoding problem (NP-complete), having withstood 40+ years of cryptanalysis since the original McEliece scheme in 1978. NIST selected it as Kyber's "mathematically distinct" backup — should a theoretical breakthrough compromise lattice-based cryptography, HQC provides an escape path.

Key Coin PQC Migration Architecture

Hybrid Signature Mode — The Transition Core

Key Coin employs Hybrid AND mode (not OR):

$\text{Valid Signature} = \text{ECDSA}(secp256k1) \text{ verifies } \mathbf{AND} \text{ ML-DSA}(Dilithium) \text{ verifies}$

Not "either/or" — both must pass to be valid. Prevents attackers from downgrading to ECDSA-only weak mode.

graph LR
    subgraph Current["Current THREAT ≤ 1"]
        A1[User TX] --> B1[ECDSA Signature] --> C1[On-chain Verified]
    end
    subgraph Hybrid["Hybrid Mode THREAT = 2"]
        A2[User TX] --> D[ECDSA Signature]
        A2 --> E[ML-DSA Signature]
        D --> F{AND Gate}
        E --> F
        F --> C2[On-chain Verified]
    end
    subgraph PQC["PQC-Only Mode THREAT ≥ 3"]
        A3[User TX] --> G[ML-DSA Signature] --> C3[On-chain Verified]
    end

Crypto-Agility Design

Core principle: algorithm selection decoupled from business logic. Never hard-code algorithms in contracts.

// ❌ Hard-coded — unacceptable
require(ecrecover(hash, v, r, s) == signer, "invalid")

// ✅ Crypto-agile — upgradeable
interface ISignatureVerifier {
    function verify(bytes32 hash, bytes calldata signature, address claimedSigner)
        external view returns (bool);
}

Verifier contracts are pluggable: ECDSAVerifier → HybridVerifier → DilithiumVerifier, with zero changes to business contracts.

Five-Tier Threat Response Mechanism

Escalation Flow

stateDiagram-v2
    [*] --> NONE
    NONE --> AWARE: Theoretical Breakthrough
    AWARE --> CONCERNED: Qubits > 1000
    AWARE --> NONE: Theory Falsified
    CONCERNED --> CRITICAL: Qubits > 5000
    CONCERNED --> AWARE: Progress Reversed
    CRITICAL --> BREACHED: ECDSA Broken
    CRITICAL --> CONCERNED: Threat Mitigated

Each tier change requires:

1. ≥ 3 quantum security expert committee members' multi-sig confirmation
2. IPFS evidence link attached (academic papers, NIST bulletins, industry reports)
3. On-chain event permanently recorded

Key & Signature Size Comparison

Side-Channel Attacks & Fault Injection Defense

Mathematical security of PQC algorithms ≠ physical implementation security. High-performance implementations (e.g., NTT number theoretic transform) may leak secrets through power consumption, timing, or electromagnetic radiation.

Known Attack Vectors

Key Coin Defense Strategy

User Migration Flow

THREAT = 0-1 (Current): Normal ECDSA usage, no action required
    ↓
THREAT = 2 (CONCERNED): Generate Dilithium key pair → register PQC public key hash on-chain → system auto-enables hybrid signing, zero friction
    ↓
THREAT = 3 (CRITICAL): 90-day countdown begins, all high-value TX must use hybrid signing, non-migrated → frozen

PQC Public Key Registration TX: registerPQCKey(bytes32 pqcPubKeyHash)

• Only submit public key hash (32 bytes), minimal on-chain storage overhead
• After registration, address binds both ECDSA public key (implicit, i.e., address) and PQC public key hash
• Updatable (72-hour timelock to prevent hijacking)

On-Chain Contract Architecture

graph TB
    QMC[QuantumMigrationCommitment<br/>0x186a...0DFc]
    QMC -->|updateThreatLevel<br/>Expert committee multi-sig only| TL[Threat Level Management]
    subgraph Deploy["Pending Deployment THREAT ≥ 1"]
        DV[DilithiumVerifier<br/>FIPS 204 Compatible]
        PR[PQCKeyRegistry<br/>Public Key Hash Registry]
        HV[HybridVerifier<br/>ECDSA AND Dilithium]
    end
    HV -->|Query during verification| PR

QuantumMigrationCommitment Core Interface:

interface IQuantumMigrationCommitment {
    function currentThreatLevel() external view returns (uint8);
    function upgradeThreatLevel(uint8 newLevel, string calldata evidenceIPFS) external;
    function migrationDeadline() external view returns (uint256);
    function registerPQCKey(bytes32 pqcPubKeyHash) external;
    function pqcKeyRegistered(address user) external view returns (bool, bytes32);
    function verifyHybrid(bytes32 hash, bytes calldata ecdsaSig, bytes calldata pqcSig, address claimedSigner) external view returns (bool);
}

Current on-chain data: threat level = 2 (CONCERNED) ✅

Global Standards Alignment