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Trade your shielded $ZEC for confidential USDC on Ethereum, without ever unshielding it. No bridge. No custodian. No wrapped ZEC. And the amount never shows up on chain. I connected @zama and @Zcash to make it work. Live on testnet 👇 What it is ZEC Desk is a small trading desk on Zama's FHEVM, on Ethereum Sepolia. On one side there's cUSDC, a dollar token whose balances are encrypted. On the other side there's shielded ZEC on Zcash testnet. You can trade either way. Built on Zama's model Zama's Confidential RFQ is already live on Ethereum mainnet, open to everyone: It runs confidential swaps with encrypted quotes, a sealed-bid pick on chain and a hidden floor. ZEC Desk takes that same model and extends it to native shielded ZEC. Zama's swap settles both legs on one chain, inside its own contract, so a Zcash leg can't plug into it directly. Here that leg lives on Zcash and settles minutes later with a proof, so the mechanics run in my own contract. It's a sketch of how native ZEC could sit next to Zama's swaps one day, with no wrapped token. How a trade works (buying ZEC) 👇 1️⃣ You lock cUSDC in the desk. The amount is encrypted. 2️⃣ Makers send encrypted quotes. Nobody sees anyone else's price, or the minimum you'll accept. 3️⃣ The contract picks the best one under FHE. 4️⃣ The winning maker sends shielded ZEC to your Zcash address, with the order's reference in the memo. 5️⃣ A zero-knowledge proof shows that payment happened, and the contract releases your cUSDC to the maker. If no proof arrives in time, your cUSDC comes back to you. Selling is the same in reverse: the maker locks cUSDC, you pay the ZEC, and the proof releases the cUSDC to you. Why these pieces Each piece does one job. Zcash keeps the payment private. Zama keeps the amounts encrypted and can still compute on them. Seam, the Zcash light client I built last month, connects the two: a contract checks every Zcash block header itself, and a RISC Zero proof shows a shielded payment reached the right receiver. The transaction, the note and the address never touch the EVM chain. The masked amount This was the hard part. Seam's proof used to write the paid amount in the clear, and ZEC amount × price gives away the dollar amount. So the amount is masked. The contract adds an encrypted one-time mask to the encrypted amount and reveals only the sum, which looks random to everyone else. The mask comes from a secret that the side receiving the ZEC hands to the payer. The proof checks that the payment was at least the sum minus the mask, and never states the amount. One-time pads are old, and Zama's RFQ uses one too. Using one to hand a value from FHE to a ZK proof is the part I haven't seen before. If you have, please send it my way. No vault, no signers Seam can read Zcash, but it can't take ZEC from anyone. So the design never needs someone to pay ZEC on someone else's behalf. Whoever pays, pays from their own wallet, and the escrow on the EVM side enforces the deal. The side that paid the ZEC can prove it itself, so nobody depends on the other side's goodwill. Seam does more than this Any EVM app that needs to know a shielded payment happened can use Seam: pay-with-ZEC checkouts, escrows, payouts, cross-chain orders. This desk is one example. Where it stands ↓ Testnet only, unaudited. On 12 November 2026 I ran a Buy end to end: ➡️ Settled with a proof: ➡️ One proof: 2 minutes on a rented RTX 4090, about $0.25 for the whole session ➡️ Gas per Buy on Sepolia: about 7.6M, in six transactions ➡️ A Sell also ran on Sepolia, up to the maker locking its cUSDC; it settles through the same proof step ➡️ Seam's light client is now deployed on Ethereum Sepolia too, next to Base Sepolia Where it can go ↓ → The desk only needs Zama's FHEVM and a cUSDC. Both already run on Polygon, where following Zcash costs a fraction of Ethereum mainnet. → Zama keeps adding chains. On any cheap EVM chain it reaches, the same desk can run, and if it comes to Base, Seam's relay already runs on Base Sepolia. → Zama's roadmap also goes beyond the EVM, to chains like Solana. Seam's verifier would need a port there. → On Ethereum mainnet, following Zcash header by header would cost over 2B gas a day, so batched header proofs are next for Seam. What it can't do yet - Settlement takes minutes, not seconds. Zcash confirmations set the pace, not the GPU. - Right now I'm the only maker, and a maker needs ZEC, cUSDC and a GPU. - Amounts are hidden, but EVM addresses are public. Read more ↓ Seam on Seam: ZEC Desk:

1/ gm. gm. Name is Hsin-Ju. I have a dark, kinda tragic personal announcement. I've decided I'd rather take $0 than accept a settlement that requires me to stay silent about what happened to me. I have since fired my lawyers at @sanfordheisler & will be releasing all the evidence from my time @hack_vc on Wed 8/26. INTRO: I've been in crypto for 9 years. Most recently I was a partner & head of platform @hack_vc which is a $600-700M crypto VC firm. Many of you may know me from my time as Head of Growth at @StellarOrg in 2017 (worked w/ the Mt. Gox founder), @Solana in 2018 (joined under ~10 ppl, but quit before my cliff), & @Fhenix in 2024. Or have attended one of my @DystopiaLabs ETH events (2019-now). Last year, I was forced to work through a serious medical emergency while at @Hack_VC due to threats by @alpackaP @dbulaevsky, saying that they would blacklist me from the space if I quit before finishing the hacksummit conference & side events that I was helping with during @kbwofficial. I was working 13-14hr days, 6 days a week, sleeping 0-4 hrs a night, and had documented Graves' disease, hyperthyroidism, and severe insomnia. I repeatedly asked to quit. Hack VC refused. This + other threats and intimidation went on for almost a month. The conditions got so bad I attempted suicide. The fucked up part is that, even after the suicide attempt, I told everyone at Hack VC (in writing) that I had no plans to sue. I was scared & extremely sick. I just wanted to leave. I told them that as long as there was no retaliation or badmouthing - I had no plans to sue. @Hack_VC chose to retaliate. After just 1 month after my near suicide, Hack VC mishandled my COBRA health insurance, refused to fix things, kept shooing me to customer support (when it's legally Hack VC's responsibility to fix this), and my insurance had issues and was not fixed for almost 4 MONTHS. Hack VC did not fix everything until I hired lawyers and had them force Hack VC to adhere to the law & fix my COBRA insurance issues. The sheer cruelty of an employer harming someone's health insurance almost immediately after they nearly committed suicide is extremely fucked up. And, even during the legal engagement, Hack VC continued to lie & attempt to harm me through their lawyers and other employees/partners (multi-million dollar carry & clawbacks can make even the nicest ppl willing to turn the other way or lie). @0xRodney @IsTheBaron @roshunpatel @Alex__Botte. Now. Almost an entire year of engagement & my near suicide anniversary coming up, our lawyers (mine & Hack VC's) have reached the point of preparing for private mediation and settlement. And...I realized that I just can't do it. I don't want money in exchange for silence. I'd rather speak. I fired my lawyers yesterday. In case it needs to be said, I did a good job at Hack VC. I was only there full time for 7 months; been part-time since 2021. I got a $50k raise to $300k, $30k bonus, and promises of additional carry that would have been implemented about a week or so after my last day. I was also offered admission into the GP entity (but not sure if admission was actually completed bc it was during my medical emergency). This + my resume, should show that me suing is not a money grab; I was genuinely harmed. I'm aware that I'm just one person (who is not rich) facing a $600-700M VC institution. I've been told by @alpackaP that he's known most of the managing partners at most VC firms for almost a decade and he could absolutely blacklist me. I'm also painful aware that the conclusion of this will probably be extremely poor for me or death - but I've accepted it. Sharing with other web2 & web3 VCs: @paulg @ycombinator @500STARTUPS @a16zcrypto @PanteraCapital @dragonflyvc @RaceCapital @hosseeb @haunventures @hiFramework @ElectricCapital @blockchaincap @Delphi_Digital @variantfund @1kxnetwork @archetypevc @shimacapital @robotventures, etc. TLDR; I’m done with continued threats, pressure, and intimidation. I'm not going to take a payout and allow Alex or Hack VC to walk away from harming me. As mentioned, I'll be dropping the evidence from my case on Wed 8/26 (or before) -- privacy be damned. Support here (or DM) please: ETH: 0x68c10776C5c05Cbf5B4C2318bE02D61B9f06B875 SOL: B7S8TPcWWJXTsmgG8ShoTmy8sNPuJ3Dbmt7z5gLFAveq

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Vibe-coded a toy demo version of the "anon billboard with moderation" idea from on aztec It's early days but you can already do very interesting nontrivial stuff!