Omar Espejel
@espejelomar
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Tech Dev Advocate @ @StarknetFndn 🔺 Growing ecosystems with code & education Cairo • Rust • Privacy Ex-@StarkWareLtd | ML Eng @ @huggingface
Joined July 2013
This a very privileged story: “I made a lot of money in a zero-sum industry, now I feel empty" I’ve got friends in insurance and banking with the same burnout just without the life-changing payout you mentioned Life is hard. Your thirties are a life crisis for almost everyone.
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The funny parallels between me and @luanalopeslara: - We are both from LATAM - I like Brazil, which is her home country - She is from Santa Catarina; I once visited Santa Catarina, Monterrey Let's go
Funny parallels between me and @luanalopeslara: - both Brazilian - both from Santa Catarina - she has a gold in the Brazilian Astronomy Olympiad and a bronze in the State Math Olympiad - I got silver in the Brazilian Math Olympiad and won (1st place) the capital’s Math Olympiad
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I must agree with you here. This is why builders remain in any ecosystem, crypto or not: they can build a large, successful startup
@IGLIVISION @jessepollak @solana @base Yes, we do You can build a large and successful startup on Solana with the biggest userbase and most mercenary liquidity in crypto Which is why Base is opening this channel in the first place
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gm here are my standards for 2026: - always up (no "halted for upgrades" drama) - battle-tested mainnet, not permanent testnet - quantum-resilient proofs / roadmap - real privacy by design, not explorer cosmetics - low or no-trust interactions with BTC / monero / zcash / ETH -
gm here’s my standards for 2026: - gym 7x/week - respects my parents - no beard - no alcohol - no twitter - no video games - owns 2+ houses - doing the thing (once a year max) - does everything i want - pays for everything - cooks and cleans - buys me gifts regularly -
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People in five years: "Of course everything makes sense, it was obvious" The Process: 0. Boring Infrastructure (2022, when I started at @StarkWareLtd) 1. Weird Apps 2. Real Volume (We are here) 3. ...
The secret to investing is to invest in unstoppable people building inevitable things.
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@Starknet @0xPsveiga For the Gen Z audience: This movie is Starkaway (2000), and the actor shown is @AbdelStark
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Building XMR↔Starknet atomic swaps to advance Starknet's privacy narrative. Stage 1: Prove the cryptographic primitive works * DONE: Cairo can verify Monero scalars (SHA-256 round-trip tested) * NOW: Researching adaptor signatures (can a scalar revealed on Starknet safely bind
github.com
Rust Monero scalar generator + Starknet AtomicLock (hashlock/timelock) with snforge tests - omarespejel/xmr-starknet-atomic-lock
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@Starknet @VitalikButerin @TimBeiko For the nerds: Block: latest Precompile: 0x0100 Input: 160 bytes (hash || r || s || x || y) Output: 0x01 Gas: 7251 Total call: 30811 The signature math checks out. It's live
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Code is MIT licensed if you want to poke at it: https://t.co/e0mEMwFh1q Because we love Ethereum at @Starknet, I built this... where we've had native P-256 since genesis. Good to see L1 catch up ♥️ @VitalikButerin @TimBeiko
https://t.co/Jn7AjwJpSK
github.com
Contribute to omarespejel/p256-verifier development by creating an account on GitHub.
Fusaka is live on Ethereum mainnet! - PeerDAS now unlocks 8x data throughput for rollups - UX improvements via the R1 curve & pre-confirmatons - Prep for scaling the L1 with gas limit increase & more Community members will continue to monitor for issues over the next 24 hrs.
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Why this matters: Smart accounts can now use Face ID/Touch ID as signers without the gas blowup. "Write down these 24 words" was always a terrible UX. Native passkey support doesn't fix everything. But it removes one of the dumbest friction points
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I built a demo to verify it actually works: * Generate P-256 keypair (simulates passkey) * Sign a message * Call the precompile on mainnet * ✅ Verified No wallet. No tx. Just a pure eth_call to 0x0100 https://t.co/8jiKUXEzGn
https://t.co/fHcCz7IjFb cc @austingriffith
😲 Holy frick! 😳 🚀 I just one-shotted an app to mainnet ethereum that lets you use passkeys to sign and verify a message onchain 🛠️ It is now incredibly simple to build an app where users can self-custody crypto without a seed phrase 🌎 Mass adoption is coming to @ethereum
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Quick context: Ethereum uses secp256k1. Your iPhone's Secure Enclave uses P-256. Verifying a P-256 signature in Solidity costs ~200,000 gas After Fusaka: 7239 gas. 96.4% reduction. Not incremental. A phase change https://t.co/HUBM3SiiYJ cc @ArjunKalsy @getclave @doganeth_en
Here are my direct, no-BS thoughts on secp256r1/P-256 I’m very bullish on Precompiles in general – especially non-native curves like secp256r1. Adding a verify precompile (RIP-7212) is one of the highest-ROI changes Ethereum can make right now. It drops the cost of verifying a
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Ethereum shipped a precompile yesterday, and mass market tech Twitter didn't notice 0x0100 now does native P-256 verification. If you work on wallets, account abstraction, or passkeys. This is a big deal cc @TimBeiko @ethereum @ethereumfndn #Fusaka
fusaka has finalized 🦓! huge congrats to everyone who worked on the upgrade, massively expanding Ethereum's capacity and feature set, without compromising on security ❤️🔥
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Want to learn how to send private transactions on Starknet? Check out this demo:
github.com
End-to-end Starknet privacy toolkit: Tongo private donation demo + Noir/Garaga verified donor badges - omarespejel/starknet-privacy-toolkit
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Just discovered my 19 year old daughter has an OnlyFans account I was devastated She's been receiving USDC payments for her photos directly to her PUBLIC @starknet wallet I sat her down and asked how much she'd made She said $8,200 in USDC I nearly collapsed That's at least
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CCTP Contracts (Testnet): TokenMessengerMinterV2: 0x04bDdE1E09a4B09a2F95d893D94a967b7717eB85A3f6dEcA8c080Ee01fBc3370 MessageTransmitterV2: 0x04db7926C64f1f32a840F3Fa95cB551f3801a3600Bae87aF87807A54DCE12Fe8 Note: Starknet uses unified TokenMessengerMinterV2 (combines
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CCTP Contracts (Mainnet): TokenMessengerMinterV2: 0x07d421B9cA8aA32DF259965cDA8ACb93F7599F69209A41872AE84638B2A20F2a MessageTransmitterV2: 0x02EBB5777B6dD8B26ea11D68Fdf1D2c85cD2099335328Be845a28c77A8AEf183 Key functions: • deposit_for_burn: burn USDC, emit message •
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For devs, here's everything you need: Starknet Domain ID: 25 Native USDC: 0x033068F6539f8e6e6b131e6B2B814e6c34A5224bC66947c47DaB9dFeE93b35fb Bridged USDC.e: 0x053c91253bc9682c04929ca02ed00b3e423f6710d2ee7e0d5ebb06f3ecf368a8
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