QuantumCoin Whitepapers

The QuantumCoin blockchain spans several technical domains — post-quantum cryptography, distributed consensus, data availability, and token allocation. Each major component is documented in a dedicated whitepaper. QuantumCoin implements NIST-standardized post-quantum cryptography (FIPS 203, 204, 205) in hybrid mode with Ed25519; see the Quantum Resistance documentation and whitepaper for details.

Quantum Resistance — NIST-Standardized Post-Quantum Cryptography

This whitepaper describes the quantum-resistant cryptographic architecture of QuantumCoin. It provides a technical analysis of the threat that large-scale quantum computers pose to classical blockchain cryptography (via Shor's algorithm against ECDSA and Grover's algorithm against hash functions) and documents how QuantumCoin mitigates this by adopting the finalized NIST-standardized post-quantum cryptography (PQC) standards:

ML-DSA (FIPS 204) — Module-Lattice-Based Digital Signature Algorithm, used for transaction and consensus message signing.
SLH-DSA (FIPS 205) — Stateless Hash-Based Digital Signature Algorithm, providing a backup signature scheme whose security relies solely on hash function properties.
ML-KEM (FIPS 203) — Module-Lattice-Based Key-Encapsulation Mechanism, used for post-quantum key establishment in peer-to-peer communication.

These algorithms are implemented in a hybrid construction with Ed25519 (FIPS 186-5), following the defense-in-depth approach recommended by NIST IR 8547. In hybrid mode, both a classical and a post-quantum algorithm must be broken for the scheme to fail, ensuring security during the transition to post-quantum cryptography.

Read more in the Quantum Resistance Whitepaper (PDF).

Consensus — Deposit-Weighted BFT with Immediate Deterministic Finality

This whitepaper presents the QuantumCoin consensus protocol: a deposit-weighted BFT protocol derived from the PBFT family that provides immediate deterministic finality for every block. The protocol uses four message phases (Proposal, Acknowledgment, Precommit, Commit) with all quorum thresholds weighted by deposit, tolerating Byzantine faults comprising strictly less than one-third of the committee's effective deposit.

Each block permits at most two rounds: Round 1 attempts normal consensus, and Round 2 forces an empty block to guarantee progress. A per-block committee of up to 128 validators is selected from an unbounded registered set via a three-pass algorithm (deposit-ranked, coin-flip, pseudorandom). The whitepaper includes formal proofs of safety (holding regardless of network timing) and liveness (under the standard partial synchrony model), complemented by TLA+ model checking. Additional mechanisms include committed-history randomness for validator selection, deposit normalization, graduated offline penalties, and protocol-enforced round-robin transaction ordering for MEV mitigation.

Read more in the Consensus Whitepaper (PDF).

QuantumCoin Vision

This paper describes the vision of the QuantumCoin platform and ecosystem. The vision is aspirational and will evolve over time.

Read more in the QuantumCoin Vision Paper.

Data Availability

Data availability is a critical property for blockchains alongside security and consensus. While many blockchain whitepapers discuss security and consensus, data availability is often underspecified. This whitepaper explains why data availability is essential and documents both the short-term and long-term data availability solutions. It also proposes a time-capsule mechanism for long-term data preservation.

Read more in the Data Availability Whitepaper.

Blockchain Allocation

An important goal of QuantumCoin is to secure the three largest blockchains from quantum computer threats. Bitcoin, Ethereum, and Dogecoin use cryptographic schemes (ECDSA, secp256k1) that are vulnerable to Shor's algorithm on a large-scale quantum computer. In addition, blockchain platforms benefit from broad decentralization of token ownership. QuantumCoin addresses both problems by forking all three blockchains along with DogeP tokens. This whitepaper explains the rationale behind this multi-fork effort, the problems it addresses, and the allocation model of the QuantumCoin blockchain.

Read more in the Blockchain Allocation Whitepaper.

Heisen GameChain

Heisen GameChain is a platform for game publishers and gamers. This initiative covers game contests, game store, global leaderboard, game world, and in-game purchases. Heisen is a token that will be created on the QuantumCoin blockchain and is the fundamental component of the Heisen GameChain.

Read more in the Heisen GameChain Whitepaper.