PoseidonCash

لقد رأينا جميعًا ذلك يحدث. المشروع في حالة ازدهار، الأجواء مرتفعة ثم تظهر شمعة حمراء ضخمة من العدم.

الرسم البياني ينهار. يبدأ الذعر. لم يكن هناك خداع، بل مجرد حوت مبكر يأخذ أرباحه. الزخم ميت والمشروع لا يتعافى أبدًا.

سيناريو آخر. أنت في وضع جيد، لكن لا يمكنك البيع دون أن تنبهك بوتات تتبع المحفظة كل العالم. إذا جنيت الأرباح، فإن المجتمع يذعر. أنت فعليًا رهينة لربحك الخاص.

لهذا السبب أنشأنا مكتب OTC خاص.

في العالم عالي المخاطر للتمويل المشفر، كانت المعاملات الكبيرة تُفرض دائمًا "ضريبة الشفافية". إذا أراد مؤسس أو خزانة أو أحد الكبار إعادة توازن موضع كبير على السلسلة، فإنهم يصبحون فورًا مرئيين للعالم بأكمله. تُطلق الروبوتات على تويتر تنبيهات، ويُسبق المتداولون السيولة، ويتحول السوق إلى وحش، مما يُفقد البائع السيطرة فعليًا.
البدائل؟ صفقات خلفية مشبوهة. نموذج "OTC تيليجرام" يعتمد تمامًا على الثقة، والوسيط المركزي، وعمليات التحقق من الهوية المُستفزة. إنه بطيء وغير فعّال، ويعارض جوهر العملات المشفرة بشكل جوهري.

When Tornado Cash launched on Ethereum, it revolutionized on-chain privacy. But it also cemented a mental model: privacy protocols are slow, expensive, and limited. Users deposit fixed denominations 0.1 ETH, 1 ETH, 10 ETH, wait for an anonymity set to grow, and pay $50+ in gas to withdraw.
Poseidon throws that mental model away.
Built from the ground-up for Solana's architecture, Poseidon introduces sharded Merkle trees, flexible denominations, 5-input/5-output UTXO transactions, and two-phase withdrawals. All while supporting native SOL, SPL tokens, and Token-2022 (coming soon)

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How It Works
Deposit: Send SOL or tokens to a sharded pool. You receive an encrypted "note" containing your secret commitment.
Transact Privately: Combine notes, split balances, send to others—all off-chain.
Withdraw: Generate a zkSNARK proof that you own valid notes without revealing which ones. A relayer submits on your behalf.
The magic is in the zkSNARK circuit: it proves "I know 5 secret notes that exist in this Merkle tree, and I'm creating 5 new output notes" without revealing anything about which inputs or what amounts.
Built for Volume
Privacy protocols have always had a throughput problem. Ethereum processes 15-17 transactions per second on a good day for the entire network. Every Tornado Cash deposit and withdrawal competes for that bandwidth, and every user contends for the same Merkle tree state.
That's not a privacy payment system. That's a privacy bottleneck.
Poseidon takes a different approach: 64 independent shards for SOL, each processing transactions in parallel with zero contention. Deposits flow into any shard. Withdrawals pull from any combination of shards, with all funds settling to a single recipient address while the anonymity set spans every shard you've ever touched.
The math is simple: 64 shards processing in parallel means 400+ privacy transactions per second across the network. That's not a theoretical maximum for Poseidon, that's over 20x what the entire Ethereum network handles for ALL transactions combined.
This is privacy infrastructure built for a high-throughput environment. Payment processors, exchanges, DAOs, treasuries, any system that needs to move volume without sacrificing confidentiality. Poseidon doesn't ask you to choose between privacy and performance. You get both.
Shards: Privacy Pools Anyone Can Create
Here's where Poseidon fundamentally differs from every other privacy protocol: shards are permissionless.
A shard is simply an independent privacy pool, its own Merkle tree, its own pool account, its own state. Each shard can hold over 67 million notes (tree depth 26). SOL supports up to 64 shards. Each token mint supports 16 shards.
The key insight: anyone can initialize a new shard for approximately 0.037 SOL. That's the rent cost for the state and pool accounts. No governance proposal. No permission. No waiting. You pay the rent, the shard exists.
Why does this matter?
For tokens: Want privacy for your favorite memecoin? Initialize 16 shards and you've got a full privacy layer for that token. The community doesn't need to petition anyone. Just pay ~0.6 SOL total and the infrastructure exists.
For scale: If 64 SOL shards aren't enough, the protocol can expand. More shards mean more parallel throughput, more distributed load, and larger combined anonymity sets.
For resilience: No single entity controls which assets get privacy. The protocol is infrastructure, not a gatekeeper.
Cross-Shard Liquidity Aggregation
Here's the powerful part: withdrawing from multiple shards happens in a single transaction.
When you withdraw, you pick a single "execute shard" where the transaction runs. Your zkSNARK proof can reference merkle roots from up to 5 different shards, proving you own notes scattered across the network. The protocol automatically aggregates liquidity: funds flow from foreign shard pools into the execute pool, then out to your recipient.
Deposited to shards 0, 1, 2, 3, and 4 over the past month? Your withdrawal combines all five into a single output. One proof. One transaction. One recipient.
The technical magic: Cross-shard withdrawals use Solana's Address Lookup Tables to compress the transaction, fitting all five foreign pool references into a single atomic operation. The aggregation happens on-chain during the prepare phase, foreign pools transfer their portion to the execute pool, which then pays out the full amount. The lookup table is ephemeral: created for the transaction, closed immediately after, rent reclaimed.
Cross-shard withdrawals cost the same as single-shard withdrawals. The protocol automatically aggregates liquidity from foreign shard pools into the execute pool, all in one atomic transaction. No additional fees. No complexity.
You get the throughput benefits of sharding, the anonymity benefits of a massive combined set spanning every shard you've touched, and the cost profile of a simple single-pool system.
What Makes Poseidon Different
Flexible Amounts, Not Fixed Denominations
Tornado Cash forces users into predetermined amounts. Want to withdraw 3.7 ETH privately? Impossible.
Poseidon: Deposit any amount. Withdraw any amount. The 5-in/5-out circuit lets you combine multiple inputs into precisely the outputs you need. No more working around arbitrary constraints.
UTXO Model with Change Outputs
Every Tornado Cash deposit creates exactly one withdrawal. You deposit 1 ETH, you withdraw 1 ETH. End of story.
Poseidon: Deposit 10 SOL, withdraw 3 SOL to a recipient, and automatically receive 7 SOL as "change" in a new shielded note. Chain transactions indefinitely without ever touching the public chain. True financial privacy, not just one-shot anonymity.
Sub-Dollar Costs
Tornado Cash verification costs around 300,000 gas on Ethereum. At 50 gwei, that's $15-50 per withdrawal.
Poseidon: Two-phase withdrawals with Groth16 verification. Total cost: approximately 0.002 SOL. Privacy shouldn't be a luxury. It should be cheap enough to use for every transaction.
Full Token Ecosystem Support
Tornado Cash is ETH-only, plus a few ERC-20 forks. Want privacy for your stablecoins? Different protocol. Different anonymity set.
Poseidon: Native support for SOL, all SPL tokens, AND Token-2022. Same protocol, same anonymity mechanics, same relayer infrastructure. One privacy layer for the entire Solana ecosystem and anyone can spin up shards for any token.
Technical Architecture
The 5-Input/5-Output Circuit
The heart of Poseidon is a zkSNARK circuit with 5 input notes and 5 output notes. Combine, split, distribute, the circuit handles complex payment flows in a single proof, generated in under 2 seconds on modern hardware.
Two-Phase Withdrawals
Solana's transaction size limit can't fit a full Groth16 proof plus all required accounts. Poseidon solves this with two-phase execution: prepare the proof, then execute the transfer. This also enables batching, prepare multiple withdrawals, execute them together for even greater efficiency.
Cross-Shard Proofs
A withdrawal can reference roots from multiple shards simultaneously. Inputs from shard 0, shard 15, and shard 47 can all combine into a single output to one recipient address. The proof is valid as long as each input exists in its respective shard's tree. The observer sees one withdrawal, they can't tell which shards, which notes, or which amounts contributed.
Relayer Architecture
Users never submit their own withdrawals that would link their wallet to the shielded note. Proofs are generated locally in the browser, encrypted requests go to the relayer, and the relayer submits the transaction. Clean separation between identity and funds.
Privacy Guarantees
On-chain unlinkability: No connection between deposit and withdrawal addresses. The zkSNARK proves you own a valid note without revealing which one.
Amount obfuscation: Flexible amounts with change outputs prevent simple matching attacks.
Timing resistance: Sharding plus large anonymity sets across 64+ pools make timing analysis impractical.
Graph analysis protection: The UTXO model means funds can flow through multiple hops privately before withdrawal.
The Vision
Privacy on blockchain has always been treated as a feature for the paranoid. Slow, expensive, cumbersome. Something you use when you really need it, not something built into everyday transactions.

Poseidon changes that equation. With throughput that scales horizontally, costs measured in fractions of a cent, permissionless pool creation, and an architecture designed for volume, this is privacy infrastructure ready for integration into real payment systems. Not a tool for hiding. A tool for transacting at scale, at speed, with confidentiality as a default.
Parallelism via 64 independent shards processing simultaneously.
Permissionless pool creation for ~0.037 SOL per shard.
Low fees via efficient proof verification, same cost whether you use one shard or five.
Flexibility via the UTXO model.
Ecosystem integration via SPL and Token-2022 support.
Privacy on Solana shouldn't feel like a compromise. With Poseidon, it won't.
Poseidon is named after the Poseidon hash function used in the zkSNARK circuits, an algebraic hash optimized for zero-knowledge proofs.

#solana #Privacy #PrivacyProtection #PrivacyMatters #zcash