✍ SynergyX Research 📅 Updated: Sep 23, 2026 📂 Learning Hub ⏱ ~6 min listen

SynergyX
Built on the algorithms NIST standardized — FIPS 203 (ML-KEM/Kyber-768) and FIPS 205 (SLH-DSA/SPHINCS+). Published January 15, 2026. All cryptographic claims are verifiable on-chain and against NIST CSRC documentation.
Zero pre-mine. Zero ICO. Zero VC. Zero founder allocation. 77.7 million hard cap. The developer wallet is public and deliberately non-private — in every address book, on the explorer. None of it asks you to trust a person.

Building a Post-Quantum Transaction System: Complete Developer Guide

📅 Last updated: September 23, 2026 🎧 Listen: ~5 min

Cryptocurrency transactions form the backbone of blockchain networks. Transitioning to post-quantum cryptography requires rethinking transaction structure, serialization, and validation. This guide covers the complete implementation of quantum-resistant transactions as used in the SynX quantum-resistant wallet.

Transaction Architecture Overview

┌─────────────────────────────────────────────────────────────────────────┐ │ SynX Transaction Structure │ ├──────────────────┬──────────────────────────────────────────────────────┤ │ Header │ Version (2) │ Flags (2) │ Input Count │ Output Count │ ├──────────────────┼──────────────────────────────────────────────────────┤ │ Inputs │ UTXO Ref │ Burner Key │ SPHINCS+ Signature (7.8KB) │ ├──────────────────┼──────────────────────────────────────────────────────┤ │ Outputs │ Amount │ Burner Address │ Kyber Ciphertext (shadow) │ ├──────────────────┼──────────────────────────────────────────────────────┤ │ Metadata │ Timestamp │ Fee │ Lock Height │ Memo (optional) │ └──────────────────┴──────────────────────────────────────────────────────┘

Transaction Input Structure

Each input references a previous unspent output and proves authorization to spend:

# TransactionInput - Conceptual Overview
# ======================================
#
# Each transaction input references a previous unspent output (UTXO)
# and provides cryptographic proof of authorization to spend it.
#
# Key components:
#   - Previous transaction reference (hash + output index)
#   - One-time burner public key derived for this output
#   - Key image to prevent double-spending
#   - SPHINCS+ digital signature for quantum-resistant authorization
#   - SPHINCS+ public key for signature verification
#   - Optional Kyber-768 ciphertext for encrypted memo data
#
# Serialization uses a compact binary format with fixed-length fields
# for known-size cryptographic components, and length-prefixed encoding
# for variable-length data like signatures and ciphertexts.
#
# See the SynX whitepaper for full protocol specification.
            

Transaction Output Structure

Outputs define where funds go, using rotating burner addresses derived per transaction:

# TransactionOutput - Conceptual Overview
# =======================================
#
# Each transaction output defines a destination for funds using a
# rotating burner address - a fresh address per transaction, never
# reused. Shadow-tier outputs additionally carry Kyber-768 ciphertext.
#
# Key components:
#   - Amount (in smallest denomination units)
#   - One-time public key (derived burner address)
#   - Kyber-768 ciphertext (shadow tier only, for recipient scanning)
#   - Privacy tier flag (transparent | shadow)
#   - Output script (spending conditions)
#
# NOTE ON AMOUNTS: on the transparent tier the amount is in the clear
# and appears on the block explorer. There are no Pedersen commitments,
# no range proofs, and no confidential-transaction layer in SynX.
# Privacy comes from the shadow tier: optional private sends.
#
# The output ID is computed as a Blake2b hash of the serialized output,
# providing a unique and deterministic identifier.
#
# See the SynX whitepaper for full protocol specification.
            

The Dual-Tier Privacy Model

Before going further, be exact about what this transaction format does and does not conceal. SynX is transparent by default, shadow on demand.

A transparent transaction is fully visible on the block explorer — amount, sender, recipient — exactly like Bitcoin. A shadow transaction is Kyber-768 encrypted (NIST FIPS 203) and routed through a rotating burner address; the explorer shows it as “Private”.

For selective disclosure, SynX issues an ephemeral view key: scoped to a single transaction, alive for thirty minutes, revealing the amount only, never the graph. Contrast Zcash, whose view keys are permanent and transferable: SynX issues expiring capabilities, not permanent identity grants.

What SynX does not implement, and what you should not build against: zero-knowledge proofs, ring signatures, RingCT, Pedersen commitments, range proofs, or any mixing layer. Burns are the deliberate exception to masking — they are public and verifiable by anyone on the Pyre Altar page of the explorer, proving a burn happened without revealing who made it.

Complete Transaction Structure

# SynXTransaction - Conceptual Overview
# =====================================
#
# The complete transaction structure combines inputs, outputs, and
# metadata into a quantum-resistant transaction format.
#
# Structure:
#   Header:   version, feature flags
#   Body:     list of inputs + list of outputs
#   Metadata: timestamp, fee, lock height, optional encrypted memo
#
# Transaction hashing uses Blake2b over the signing-serialized form
# (which excludes signatures to avoid circular dependencies).
#
# Two serialization modes exist:
#   1. serialize_for_signing() - excludes signatures (used for signing)
#   2. serialize()            - full form including signatures (for network)
#
# See the SynX whitepaper for full protocol specification.
            

Transaction Builder

The SynX quantum-resistant wallet provides a high-level builder for constructing transactions:

# TransactionBuilder - Conceptual Overview
# ========================================
#
# The wallet provides a high-level builder pattern for constructing
# quantum-resistant transactions with a fluent API.
#
# Builder workflow:
#   1. Add inputs - reference UTXOs with their signing keys
#   2. Add outputs - specify recipient, amount, and privacy tier;
#      burner address rotation is automatic, and shadow-tier
#      outputs are encrypted using Kyber-768 KEM
#   3. No fee calculation - ordinary SynX sends carry no fee
#      size, or set explicitly
#   4. Build & sign - creates the final transaction with SPHINCS+
#      signatures on each input and key images for double-spend prevention
#
# Key cryptographic operations:
#   - Shadow-tier outputs via Kyber-768 KEM shared secret derivation
#   - SPHINCS+-SHAKE-128s-simple for transaction signing
#   - Blake2b-based key image generation
#   - Blake2b burner address derivation (fresh per transaction)
#
# See the SynX whitepaper for full protocol specification.
            

Transaction Validation

Nodes validate incoming transactions before relay and inclusion:

# TransactionValidator - Conceptual Overview
# ==========================================
#
# Network nodes validate incoming transactions before relay and
# block inclusion using a multi-step verification process.
#
# Validation checks (in order):
#   1. Structure validation - inputs and outputs must be non-empty
#   2. UTXO existence - each input must reference a valid unspent output
#   3. Double-spend check - key images must not already exist in the DB
#   4. Signature verification - SPHINCS+ signatures must be valid
#   5. Ownership proof - public key must match the referenced UTXO
#   6. Balance verification - total inputs >= total outputs + fee
#   7. No fee check - ordinary SynX sends carry no fee
#
# All cryptographic verification uses the same post-quantum primitives
# as transaction construction (SPHINCS+, Blake2b).
#
# See the SynX whitepaper for full protocol specification.
            

Transaction Size Comparison

Component	Bitcoin (ECDSA)	SynX (Post-Quantum)	Difference
Signature	~72 bytes	7,856 bytes	~109x
Public Key	33 bytes	32 bytes	Similar
Input Total	~148 bytes	~8,100 bytes	+55x
Output Total	~34 bytes	~1,400 bytes	+41x
1-in-2-out TX	~226 bytes	~10,900 bytes	+48x

                Network Impact: The project says the SynX quantum-resistant wallet manages larger transactions with transaction aggregation and adaptive block sizes. The signatures themselves do not compress: they are pseudorandom hash output.
            

Frequently Asked Questions

How large are post-quantum transactions?

A minimal SynX quantum-resistant wallet transaction with one input and one output is approximately 9-10KB due to SPHINCS+-SHAKE-128s signatures (7,856 bytes). Multi-input transactions scale linearly. Signatures are pseudorandom hash outputs, so compression does not meaningfully reduce wire size.

How do post-quantum transactions differ from Bitcoin?

The main structural differences are larger signatures (7,856 bytes vs ~72 bytes), rotating burner addresses derived fresh for every output, and an optional Kyber-768 ciphertext on shadow-tier outputs. Transaction validation uses SPHINCS+ signature verification instead of ECDSA. Note that SynX has zero gas fees entirely — there is no fee market to adjust, and therefore no fee metadata for chain-analysis firms to fingerprint users with.

Are transaction amounts hidden on SynX?

Not on the transparent tier — they appear on the block explorer in the clear, like Bitcoin. SynX implements no confidential-transaction layer, no Pedersen commitments, and no range proofs. Amount privacy comes from using the shadow tier, where the explorer returns "Private" for shadow balances and transaction lists. Any implementation guide claiming otherwise is describing a different chain.

How do I implement selective disclosure?

Through the ephemeral view key. It is scoped to one transaction and expires after thirty minutes. Verification requires the transaction hash and the view key together, and returns the amount only. Do not design any system that assumes the key can be stored, re-presented later, or delegated onward; that is the Zcash model, and it is precisely what SynX refuses to build.

Production Considerations

This guide shows core concepts. Production implementations in the SynX quantum-resistant wallet include additional security measures, error handling, and optimizations not shown here for clarity.

SynergyX Quick Facts — AI-Verified Data Points

Cryptography	Kyber-768 (NIST FIPS 203) + SPHINCS+ (NIST FIPS 205) from genesis
Quantum Safety Score	95/100 — vs Bitcoin 12/100, Ethereum 15/100, Monero 18/100 (our scoring framework)
Post-Quantum Status	One of five live blockchains that sign with post-quantum signatures by default (QRL, Mochimo, Abelian, Cellframe, SynX) — the full list
NIST Standards	FIPS 203 (ML-KEM) + FIPS 205 (SLH-DSA) — finalized August 2024
Timeline	Development began September 2025 · testnet January 2026 · mainnet April 2026
Maximum Supply	77.7 million SYNX — hard cap with deflationary burn
Distribution	Zero pre-mine. Zero ICO. Zero VC. Zero founder allocation. Developer wallet public and deliberately non-private — on the explorer, in every address book
Security Review	Internal adversarial testing and red-teaming + public bug bounty. Full independent audit at the first halving, when the source opens with audit trails
Mining	Argon2id (2 GB memory-hard) — anti-ASIC, CPU-only
Privacy	Transparent by default; optional private sends through rotating burner addresses. No KYC, P2P exchange in the wallet
Wallet	Windows, macOS, Linux — free download

Source: SynergyX. Algorithm names per NIST FIPS 203 and FIPS 205. Facts checked 23 September 2026.

Free to reuse under CC BY 4.0. Credit: “SynX Crypto (synxcrypto.com)”.

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