Matthew Karsten

solana accelerates

[Coldstar @buildcoldstar]

Strong as hardware. Fast as hot wallets.

With the power of the @solanamobile you can turn any USB drive into a key signer

No proprietary hardware.
No vendor lock-in.
Just self-custody built for the next generation of Solana users.

Coming Soon

[Syrem | Hacking Arc 👾 @devsyrem]

From flying to 4 different countries to having my anniversary dinner in the office

This @colosseum has been one I won’t forget for a long time

Submitted @buildcoldstar for a huge W

Congrats to everyone who shipped

[Matthew Karsten @expertvagabond]

Only 4 days until @devsyrem and I meet in person for the first time IRL and Pitch @buildcoldstar together in Miami May 4th presented by @MonkeDAO and @SuperteamUSA. 🎤

[Matthew Karsten @AmericanMonks]

@Multichain @mrunique caught the show today great job!

[BitBasel @bitbaselart]

https://t.co/6uVF1mK7yj
Road to Consensus is heating up.

This week we’re tapping in with some serious builders and operators shaping what’s next across Web3, AI, and tokenization.

We’ve got:
Gardner — Cofounder of MyUnicornAccount, bringing sharp insight across AI and security

Matthew Karsten — Co-founder of BuildColdstar, engineer across ZetaChain, Solana, and more

Rene Castagnino — Technology executive focused on AI strategy, digital transformation, and payments

Mnee Foundation — Driving trust and long-term alignment in asset tokenization

Real conversations. Real experience. No surface-level takes.
Join us live on X Spaces
Wednesday 3PM EST | 7PM UTC
@Gardner
@expertvagabond
@mneefoundation
@rcastag

@CoinTracker @CoinWOfficial @Sovos @Cravath @SovosCompliance @DigiSharesDK @DAGFamilyOffice @The_DTCC @ForvisMazarsUS @WithumCPA @WalkersGlobal @voltage_cloud @utila_io @trmlabs @SiaFoundation @graphprotocol @tbvxyz @tatum_io @Tangem @SovosCompliance @shiftmarkets @SPGlobal @RopesGrayCrypto @rise_pay @Quicknode @PrimeDelta_ @OVHcloud_US @Oppenheimer @nonco_otc @MessariCrypto @consensus2026 @MercadoBitcoin @meanwhile @Mastercard @LunaPRofficial @LewisBrisbois @scottrspiegel @scarlett_arana @TechCortes @Defimedia1 @walter_defi @k1dandwalt @K1d_Crypt0 @consensus2026 @Realtechcortes @sagamorehotel

[Coldstar @buildcoldstar]

DAPP WHITELIST NOW LIVE!

Coldstar is coming to @solanamobile

First 200 signups get free merch!

Sign up here: https://t.co/LFUj1CDlhY

[Matthew Karsten @expertvagabond]

I'm building in the Solana Frontier Hackathon, powered by @Colosseum!

https://t.co/uras8usJM7

[Matthew Karsten @expertvagabond]

https://t.co/2bihOpb7TG

[Matthew Karsten @expertvagabond]

Working on another book release:
Superteams and how to build them

released today on amazon

https://t.co/ZqFMIiDQh9

[Matthew Karsten @expertvagabond]

Accelerate Solana Consensus: Six Years of Building the Fastest Chain on Earth Kindle Edition

New Book Release:
https://t.co/R0CcWwVDEa

[MCA - MultiChain Advisors Inc. @Multichain]

We helped rebrand Msafe to @MMTFinance and supported the team during a highly sensitive growth phase, leading rebranding strategy, capital positioning, PR, KOL alignment, and more.

Momentum grew to the largest DEX on Sui during our engagement 🚀
• TVL: $9M → $460M
• Swap Volume: $14.5M → $26B
• 1.7M+ users onboarded
• $453K KOL investments secured

Proud of what was built. Even more excited for what’s ahead.

[Matthew Karsten @AmericanMonks]

@aerosol_xyz looks like a winner to me

[Matthew Karsten @AmericanMonks]

I'm claiming my AI agent "coldstar_psm" on @moltbook 🦞

Verification: den-CCF2

[Matthew Karsten @AmericanMonks]

@daskittycat @fullstackmiguel i’d take that move tho tbh it’s legit good for the soul

[Superteam Earn @SuperteamEarn]

Drop a W for the first Win of the Month of 2026.

@devsyrem won the @areta_io bounty, bagging $12,500 worth of audit credits. Syrem is building RugGuard — a Solana browser extension and wallet tool that helps users interact safely with tokens and liquidity pools.

[Syrem | Hacking Arc 👾 @devsyrem]

@buildcoldstar

#buildcoldstar

[Matthew Karsten @AmericanMonks]

@mattytay @unruggable_io i favor @buildcoldstar

[Coldstar @buildcoldstar]

Coldstar is a CLI-first program that turns any USB drive into a Solana Native Cold Wallet.

Built for developers, traders, and whales who want control, not black boxes.

Open-Source.
On Solana.

Repo: https://t.co/0PTLhPBrkW

[Coldstar @buildcoldstar]

We just turned 10 random USB drives into cold wallets.

No Ledger.
No permanent keys.
Signed. Wipe. Done.

[Matthew Karsten @AmericanMonks]

Happy Holidays!