Building Bitcoin infrastructure, engineering knowledge, and open-source content & research.
Tbilisi, Georgia
Joined August 2026
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Building on Bitcoin or a Bitcoin L2?
We help teams both ship and harden Bitcoin apps.
GreyBound offers:
• On-demand Bitcoin apps focused on self-custody, multisig, and advanced scripts
• Production readiness reviews before mainnet (keys, recovery, signing flows, node reliability, libraries used)
• Security findings that turn into fixes, no vague audits or reports
Transactions are irreversible and keys are the asset.
If you’re building something that touches real funds whether you need help designing it or making sure it’s ready to operate safely. We’re open to a free consultation.
Reach out if you’re working on Bitcoin or Bitcoin L2 products and want to talk scope.
#Bitcoin #SelfCustody #Multisig #Lightning #BitcoinL2s #Security
GreyBound retweeted
$ZEC is a planned demolition event like the 9-11 attacks to bankrupt the crypto ecosystem, and to make people distrust private self custody of their wealth through cryptocurrency so they rely on centralised banks once more to usher in CBDCs
Zec = LUNA 2.0
You have been warned.
Many have forgotten about the Orchard exploit for $ZEC (which was never accidental to begin with, it was intentional)
I have it on good authority that an equivalent amount of the supply has been secretly minted
And at the right time, Zec is a luna 2.0 waiting to happen.
You have been warned.
An ongoing BTC assets sweep have been identified 🚨
On 4 September, 435 Bitcoin wallets paid this address in about two hours :
bc1qx37pxm3svzf926046neuhac8ke8qy5evylpvyx
A total of 0.0549 BTC was swept. The coins are still there and haven't yet been spent.
If one of your addresses paid that address on 4 September, that wallet backup is stolen. Make a new wallet and move whatever is left. Never reuse that address again.
We will continue investigating to find the probable cause of this attack. if any of your addresses exists in the list below please reach out on comments so we can help pinpoint this sweeper attack.
We believe the attacker either had access to victims wallets already and the attack was a leftover key sweep.
Another possibility is that the attacker got access to victim devices through a malware and the attack might be related to a wallet misimplementation.
We will not DM you a recovery address. and be careful of anyone who offers such service. Spent coins are unfortunately irrecoverable.
For now we will keep investigating.
⚠️ Ordinals drain warning
Space Monkey (@Katman069) got hit. Tracked the wallets from his callout.
Timeline: night of Sep 3 → early Sep 4 ET (~2 days ago) the thief ran a ~2hr consolidation burst — 435 txs into one hopper. Still sitting there. ~0.0549 BTC across 435 UTXOs (heavy 546-sat inscription dust sweeps). Nothing spent out yet.
Hopper (still live):
bc1qx37pxm3svzf926046neuhac8ke8qy5evylpvyx
Intermediate (emptied into hopper Sep 3 ~10:46pm ET):
bc1qy42hc8y50r5qga7hrvzhf2tg62vxtyk8jrh94w
Pay attention out there.
@The_LonelyBit @GreyBound_Tech and any other investigators — eyes welcome.
Transactions are irreversible.
Keys are the asset.
Before launching your product to the mainnet we always ask four questions.
Full framework in the article.
Respect to Mostro team for how quickly and seriously they handled the security findings.
Shipping consistently with meaningful fixes so promptly shows real commitment to their users’ security.
This is the kind of response sets a strong example for the entire Bitcoin + Nostr ecosystem.
Glad we could help strengthen Mostro. Keep building !
#GreyBound #Mostro #Bitcoin #Lightning #Security
Mostro v0.18.5 is out 🧌⚡
New version with important security fixes.
If you run a Mostro node, update as soon as possible.
Highlights of this version:
🔐 NIP-44 as the default transport
for protocol communications. Gift-wrap (NIP-59) remains available as an explicit opt-in.
🛡️ Multiple bond system fixes:
corrections in buyer payout handling, orderbook publishing, and payment processing per settled order.
Thanks to the Red Team and Greybound Team for their security reports ⚡
Update your node 👇
github.com/MostroP2P/mostro/…
#Bitcoin #Lightning #Nostr #P2P #Mostro
"Never plugged my hardwallet anywhere" was treated as the whole security model.
Then Bitcoin moved on air-gapped devices. Seeds that never left the house. No USB. No phishing button clicked.
The words were never as random as the box implied.
How many more wallets need to be drained before Bitcoin infrastructure is taken seriously?
Greybound exists to build and secure that infrastructure. Attackers go after your configs, your key management, misimplementations. And even your users.
Every corner of your wallet architecture will be reviewed. Your software wallet will be fixed. Your PSBTs and signing workflows will be hardened and tested.
No generic advice. No abandoned reports.
We protect the layer everyone ignores. Before and even if it's too late.
#GreyBound #Bitcoin
