Testnet live — 9 nodes — block —
Your money
is yours.
A privacy-first cryptocurrency where every transaction is shielded by default, supply is cryptographically auditable, and no permission is required to participate.
Privacy money that doesn’t depend on permission to participate. CYNC↔BTC atomic swaps are a constitutional commitment under Article XV — they ship in v1.1, after the base chain is live on mainnet and cyncswap has cleared its own dedicated audit. Same staging Monero used: chain first, novel crypto later, each behind its own audit.
Public testnet launches in
--days
--hours
--minutes
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Public testnet is live.
22
Privacy features
100M
Supply cap
0%
Dev tax
16
Ring size
30%
Fee burn
"We built CoinCync on one principle: your money is yours. Not visible to surveillance. Not subject to seizure. Not dependent on permission. Enforced by proofs, not promises."— The CoinCync Manifesto
§ 01
Three principles.
Zero compromise.
§ 01
Private by default
Every transaction is shielded with CLSAG ring-16 signatures, Pedersen commitments, Bulletproofs+ range proofs, and stealth addresses. No opt-out. No transparent mode. Privacy is mandatory.
§ 02
Auditable by anyone
Supply is cryptographically verifiable. Pedersen commitments are additively homomorphic — they balance without revealing amounts. No trusted setup. No ceremony. Anyone can audit.
§ 03
No permission needed
CPU-only RandomX mining. 0% developer tax. No premine. No founder allocation. The Constitution enforces these rules at the protocol level — permanently.
§ 02
Four layers of privacy.
Each layer addresses a different attack surface. Together they provide the strongest privacy guarantees of any cryptocurrency.
Layer 1 — Cryptographic
Protects the content
Who sent. Who received. How much.
- CLSAG ring-16 signatures — real signer hidden among 16 decoys
- Stealth addresses — one-time Ristretto255 destinations
- Pedersen commitments — amounts hidden, homomorphic balance
- Bulletproofs+ — compact non-negative range proofs
- Encrypted memos — ChaCha20-Poly1305 + ECDH
- Key images — double-spend prevention without revealing source
- View tags — 90% faster wallet sync
Layer 2 — Network
Protects the metadata
IP addresses. Timing. Traffic patterns.
- Dandelion++ — random stem path before broadcast
- Noise_XX — Signal-grade encrypted P2P
- Traffic shaping — 0–200ms random jitter
- Constant-rate padding — masks activity patterns
Layer 3 — Wallet
Protects the user
Selective disclosure. Plausible deniability. Recovery.
- Uniform decoy selection — defeats recency analysis
- Time-scoped view keys — export for a specific block range
- Plausible deniability — dual-password encryption
- Auto-churn — Poisson-distributed self-sends
- Dead man's switch — time-locked recovery
- Uniform 2-in/2-out shape — defeats heuristic analysis
- FROST multi-sig — indistinguishable from single-sig
Layer 4 — Constitutional
Enforced by consensus
Hardcoded rules that no one can change.
- Mandatory privacy — no opt-out, no transparent mode
- No surveillance — no blacklists, no freezing, no backdoors
- No balance lookup — no RPC to query an address
- 4th Amendment — financial records constitutionally protected
§ 03
How a transaction works.
Four cryptographic layers protect every transaction. Here's what happens when you send CYNC.
§ 04
Sound money.
Provable scarcity.
An asymptotic emission curve with tail emission and fee burn creates a self-sustaining, naturally deflationary currency.
Supply cap100,000,000 CYNC
Block time120 SECONDS
AlgorithmRandomX CPU-ONLY
Initial reward~50 CYNC/BLOCK
Tail emission0.6 CYNC/BLOCK FOREVER
Fee burn30% DESTROYED (50% CONGESTED)
Developer tax0% CONSTITUTIONAL LOCK
Premine0 EVERY CYNC WAS MINED
Emission Curve — reward = max(0.6, (100M − mined) / 2M)
No halvings. No cliffs. Smooth asymptotic decay to 0.6 CYNC/block tail emission — sustaining miners forever while keeping supply capped at 100M.
Fee Distribution
NORMAL
CONGESTED
Burned CYNC is permanently destroyed — reducing effective supply over time.
§ 05
Written in stone.
The CoinCync Constitution is permanent. It cannot be amended, repealed, or superseded. These are not promises — they are protocol rules.
Article I — Fixed Supply
"The total supply of CYNC shall never exceed 100,000,000 coins. The network itself will reject any block that violates this formula."
Article III — Mandatory Privacy
"All transactions on CoinCync are private. There is no transparent mode. There is no opt-in privacy tier. Privacy is mandatory."
Article IX — No Surveillance
"The CoinCync protocol shall never include any feature whose primary purpose is to enable financial surveillance. Blacklists, chain analysis hooks, mandatory memos are permanently prohibited."
Article X — Immutability
"This Constitution is permanent. It cannot be amended. It cannot be repealed. It cannot be superseded by any governance process."
§ 06
Three commands to mine.
Build from source and mine your first block. Any CPU. No GPU required. No pool required.
# Clone and build (Rust 1.75+, ~3 min)
$ git clone https://git.coincync.network/coincync/cync-protocol.git
$ cd Cync-Protocol
$ cargo build --release --features "randomx testnet"
Compiling coincync v1.0.8 — 700+ tests pass
# Start a node
$ ./target/release/coincync-node --network testnet
Syncing... block 43891 of 43891 (100%)
# Mine on personal hardware (cloud VPS providers prohibit it)
$ ./target/release/coincync-tui-miner --testnet --address tCYNC3... --threads 4
Mining at 142 H/s — RandomX — 4 threads
$ git clone https://git.coincync.network/coincync/cync-protocol.git
$ cd Cync-Protocol
$ cargo build --release --features "randomx testnet"
Compiling coincync v1.0.8 — 700+ tests pass
# Start a node
$ ./target/release/coincync-node --network testnet
Syncing... block 43891 of 43891 (100%)
# Mine on personal hardware (cloud VPS providers prohibit it)
$ ./target/release/coincync-tui-miner --testnet --address tCYNC3... --threads 4
Mining at 142 H/s — RandomX — 4 threads
§ 07
Get started.
Two paths in. Pick the one that matches what you're trying to do.
For users
Send and receive CYNC
Install the wallet, fund it, send your first private transaction. About 5 minutes.
- Download the wallet — Windows installer, auto-syncs to testnet
- Create a wallet — 24-word seed, encrypted on disk
- Claim 10 tCYNC from the faucet — or mine your own with the wallet's built-in miner
- Send your first private transaction — ring-signed by default, no opt-in needed
For developers & operators
Build, run, integrate
Compile from source, run a full node, talk to it over JSON-RPC. About 30 minutes.
- Build from source — Rust toolchain,
cargo build --release - Run a node — 2GB RAM, 20GB disk, syncs in <1h on testnet
- Talk to it via JSON-RPC — 16 methods, curl-friendly examples
- Submit a CIP — propose changes, no permission required
Desktop Wallet
Windows installer. Auto-spawns a local node, generates an RPC key, and connects to testnet on first launch.
↓ Download Setup.exe
Start Mining
RandomX CPU-only. Any computer can mine. 50 CYNC per block at genesis.
→ Mining Guide
Run a Node
Strengthen the network. 2GB RAM, 20GB disk. Ubuntu, macOS, or Windows.
→ Node Guide
Build on CoinCync
JSON-RPC API. 16 methods. Full documentation with curl examples.
→ API Reference
§ 08
What's next.
A transparent roadmap for CoinCync development.
Phase 1 — Foundation
Core Protocol & Internal Testnet
RandomX CPU mining, CLSAG-16 ring signatures (ring size 11→16 bootstrap ramp at block 10,000), Bulletproofs+ range proofs, stealth addresses, Dandelion++ propagation, desktop wallet, block explorer, 5-node fleet across 3 continents.
Complete
Phase 2 — Privacy Innovations
7 Advanced Privacy Features
Decoy defense, encrypted memos, scoped view keys, deniable wallets, traffic shaping, dead man's switch, auto-churn. FROST multi-sig indistinguishable from single-sig.
Complete
Phase 3 — Constitutional Foundation
19 Articles & 15 Rights, Compile-Time Locked
Constitution + Bill of Rights with critical-files lockfile (SHA-256-protected) and 8 compile-time tripwire constants. Articles forbid the Terra-class failure modes (no algorithmic capture, no admin keys, no external trust, no surveillance layer, no fee redirects). CIP process documented; 9 CIPs published — CIP-001 (atomic swap), CIP-002 (cynchub), CIP-007 (hard-fork activation policy), CIP-008 (FROST coordinator), CIP-009 + CIP-009.D (reorg defense + miner-signed rolling checkpoints), CIP-010 (testnet hard-fork rehearsal), CIP-011 (rolling-finality activation), CIP-012 (FROST coordinator deployment).
Complete
Phase 4 — Public Testnet
Open Network & Hardening
Public testnet launching week of 2026-05-09. Anyone can run a node, mine, transact, build wallets. 72-hour pre-launch soak, peer-quality scoring, smoke-test transaction flow. Third-party audit kickoff. Real-world reliability data feeds the mainnet decision. Three new infrastructure crates shipped this phase:
coincync-frost-coordinator (M-of-N signing relay, including coord WSS server with rate-limit + idle-timeout + Prometheus metrics, plus coord-cli operator binary), coincync-rolling-finality (pure-state library + real ed25519 verifier + borsh wire codec for CIP-009.D), and coincync-swap (atomic-swap protocol + handshake state machines + state persistence + cyncswap CLI). 165+ new tests covering composition + adversarial cases.In Progress
Phase 5 — Mainnet Prep (v1.0)
Base-Chain Audit & Signed Releases
Base-chain audit on consensus, P2P, wallet, mining, and reorg defense. Multi-maintainer signed-release infrastructure (M-of-N via FROST coordinator). Reproducible Docker builds verified byte-identical. Genesis ceremony preparation: mainnet seed nodes, initial checkpoint set, monitoring live ≥ 7 days pre-genesis. Atomic swaps (cyncswap) and the Orchard shielded pool are deliberately not in v1.0 scope — each is the largest novel-cryptography surface in the codebase and ships in its own release after its own audit. Same staging Monero used: chain first, novel crypto later.
Planned
Phase 6 — Mainnet Genesis (v1.0)
October 1, 2026 — Base Chain
v1.0 mainnet launch. Privacy money chain: mine, send, receive, multi-sig, with the full 7-feature privacy stack and CIP-009 reorg defense active. Desktop wallet ships base-chain features only; the Trade tab unhides in v1.1 once cyncswap clears its own audit. Hardware wallet support and mobile wallet beta land in v1.0.x point releases.
Planned
Phase 7 — cyncswap (v1.1)
CIP-001: CYNC↔BTC Atomic Swaps
Trustless CYNC↔BTC atomic swaps with the 6-layer user-safety stack. Substantially complete today — 346 tests pass with strict-DLEQ, mutation score 100% on audit-critical files, ~97% line coverage on the audit perimeter, libFuzzer + AddressSanitizer overnight runs clean across 27 targets. Ships after v1.0 mainnet is live and cyncswap has cleared its own dedicated audit (kickoff target ~30 days post-mainnet; estimated Q1–Q2 2027). Once it ships, every Bitcoin holder is one transaction away from holding CYNC trustlessly — no centralized exchange, no federation, no custodial bridge.
Planned
Phase 8 — cynchub Liquidity Layer
CIP-002: PoW-Secured Cross-Chain Trading
12–24 months post-mainnet. Auxiliary PoW chain merge-mined with CoinCync, hosting an on-chain order book for trustless CYNC↔BTC↔stablecoin trading. Miners coordinate; HTLCs settle. The PoW alternative to PoS bridges — no multisig, no federation, no admin authority. Conditional on cyncswap stability and the v1.3 entry criteria in the public roadmap.
Future
Public CIP register · view all proposals →
Mainnet Genesis
October 1, 2026
00:00:00 UTC — the first block that can never be changed
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§ 09
Responsible disclosure.
Found a bug that could affect users? Reach out before posting publicly.
CoinCync is a solo-developer, MIT-licensed project at testnet stage. We don't currently have funding to back a paid bug-bounty program, and we'd rather say so plainly than promise payouts we can't honor. A funded program will launch alongside the third-party audit before mainnet.
In the meantime, please report security issues responsibly. Public credit on disclosure (with your consent), and a coordinated fix-and-publish timeline that protects users.
Email: [email protected]
PGP: 2CAA 920F 8B96 1772
Scope: consensus, privacy, wallet integrity, key handling, network
CI: 520+ tests, fmt + clippy + audit on every PR
§ 10
Frequently asked.
Is CoinCync a Monero fork?
No. CoinCync is written from scratch in Rust. It uses similar cryptographic primitives (CLSAG ring signatures, Pedersen commitments, Bulletproofs+, stealth addresses) because those are the strongest known tools for transaction privacy. But the codebase, consensus rules, emission curve, fee model, and Constitution are entirely original.
Can I mine on a laptop?
Yes. CoinCync uses RandomX, a CPU-only proof-of-work algorithm. GPUs and ASICs offer no advantage. Any modern CPU with 2GB of free RAM per thread can mine. At genesis, a laptop with 4 cores earns roughly 50 CYNC per block found.
How is supply auditable if amounts are hidden?
Pedersen commitments are additively homomorphic. This means you can verify that inputs equal outputs without knowing the actual amounts. Every node independently checks that no coins are created from nothing — the math balances without revealing any values. Combined with Bulletproofs+ range proofs (which prove amounts are non-negative), this guarantees no hidden inflation.
Why no GPU or ASIC mining?
RandomX is designed so that the most efficient hardware to execute it is a general-purpose CPU. An ASIC for RandomX would essentially be a CPU, offering no economic advantage. This keeps mining accessible to anyone with a computer and prevents the centralization that GPU farms and ASICs create in other networks.
What happens if I lose my keys?
Your funds are controlled by your 24-word seed phrase, encrypted with Argon2id + XChaCha20-Poly1305. If you lose both your seed phrase and your wallet file, the funds are permanently inaccessible. CoinCync includes a dead man's switch feature — time-locked recovery that can send funds to a backup address after a configurable period of inactivity.
Can I disclose transactions for tax or audit purposes?
Yes. Time-scoped view keys let you selectively reveal transactions within a specific block range to an auditor, exchange, or tax authority — without exposing your full history or breaking anyone else's privacy. You choose what to reveal and to whom.
When does mainnet launch?
October 1, 2026 at 00:00:00 UTC. The genesis message reads: "CoinCync Mainnet Genesis - Privacy You Can Audit - October 2026". Until then, the testnet is live with mining active. All testnet coins will be wiped at mainnet launch. v1.0 mainnet ships the base chain only — mine, send, receive, multi-sig, with the full 7-feature privacy stack. CYNC↔BTC atomic swaps (cyncswap) ship in v1.1 after their own dedicated audit, ~Q1–Q2 2027. Same staging Monero used: chain first, novel crypto later, each behind its own audit.
§ 11
Built on well-known primitives.
No homemade crypto. Every primitive in CoinCync is published, peer-reviewed, and well-documented. We stand on these shoulders.
Don't trust.
Verify.
Every CYNC in existence traces to the emission curve. The math can be checked by anyone, at any block, on their own node.