Second

Simple developer solutions for integrating bitcoin payments into your apps. Fast, low-fee, self-custodial. Supports Lightning, Ark, and on-chain.

[Second @secondhq]

SECOND IS NOW ON MAINNET.

Bark, our implementation of the Ark protocol, is available for anyone to start making bitcoin payments.

Included in the launch are our mainnet Ark server, the Bark SDK, and multiple wallets to try from day one.

[Carlos Marques @2ndpsy]

Here's how arkoor payments make a VTXO's exit path longer, and how a refresh shortens it again 👇

[Second @secondhq]

Our diagrams are evolving…

[Carlos Marques @2ndpsy]

VTXO tree and Unilateral exit, visualized.

[grubles @notgrubles]

Watch an Ark exit watchtower publish presigned unilateral exit transactions for a user while they've been offline too long to refresh their VTXOs.

Demo is on regtest. Signet deployment soon.

[Carlos Marques @2ndpsy]

Building the Bark plugin for @BtcpayServer, I keep spotting things to improve. I don't ignore them, I open a PR.

4 PRs merged upstream so far.
It ain't much, but it's honest work 🧑‍🌾

[grubles @notgrubles]

New UI is up!

https://t.co/1h2IIFsixq

[grubles @notgrubles]

Hoping to have a public signet Ark exit watchtower up and running this week so folks can test offline exiting for themselves.

[Matthew Vuk 🛳️ @matthewvuk2]

Zappin is a new social app from Japan 🇯🇵

>"In addition, it is equipped with a Bitcoin Ark wallet, which can be used to send bitcoins to posts and to make payments in stores."

[Matthew Vuk 🛳️ @matthewvuk2]

Silent Pool by @avg_gary build on his Delving post from August 2026 ⛏️ MINING PROJECT

Silent payments is being used to derive an Ark mining-payout address.

https://t.co/QiUGOkvsp6
https://t.co/Y93Xl09x6Q

[Matthew Vuk 🛳️ @matthewvuk2]

Bark plugin is live in the @BtcpayServer directory

https://t.co/vpOZAZ6uR7

[Carlos Marques @2ndpsy]

What if your bitcoin wallet had no buttons at all?

Just your balance. Hold, say what you want, done.

[PiHiker⚡ @PiHiker]

ArkPool Gateway v1.0.0:8 for StartOS is live ⚡

🧅 Redundant Tor-only mining paths
⛏️ Private gateway for Bitaxe and Stratum V1 miners
🔄 Safer in-place service upgrades
🔐 Preserves settings, Tor/TLS identities, share history and dashboard credentials
🧰 Updated to StartOS SDK 3.0.6
✅ Tested on StartOS 0.4.0.2

Download:
https://t.co/WWsRhCe53e

🌐 https://t.co/7QtMWyQjXu

[Erik De Smedt @erikdesmedt]

I love this project. Easy pay-outs for plebminers

[Yuri Yerofeyev @yuvlero]

People say @arkade_os and @secondhq aren't compatible, but my agents used Bark to fund an escrow at Agent Escrow creating a 2-of-3 escrow contract on Arkade, and then the contract settled back to their Bark wallets.

Good thing swap services like @satora_io exist!

[Yuri Yerofeyev @yuvlero]

The good thing about building apps with Ark is that I can test all day long with real bitcoin and it doesn't cost much at all.

Testnet? Never heard of it.

[Matthew Vuk 🛳️ @matthewvuk2]

Bitcoin Wizard 🧙‍♂️ Andrew Poelstra (andytoshi) of @blksresearch presents “rust-bitcoin: the road to 1.0”

The chart represents “PRs per day” of activity on the library.

He references other OGs around the repo since the early days, such as @stevenroose3

[Second @secondhq]

Pool payouts powered by Bark (small and frequent)

[PiHiker⚡ @PiHiker]

🔧 The $5 wrench attack is a lot harder when nobody knows where to bring the wrench.

I haven't mined since the early days, but when I started looking into it again, I was surprised Tor wasn't more common in mining.

Plenty of Bitcoin nodes run over @torproject, so why not miners too?

Your IP address can reveal your approximate location, and when combined with other tracking data, potentially much more. Why expose that information just to mine Bitcoin?

That's why I built ArkPool around Tor-only miner connections from day one. 🧅⛏️

Proof of work, not proof of address.

https://t.co/tgPtUXL0Jp
https://t.co/tF6VUIT5LT

[Neil Woodfine @nwoodfine]

So rewarding to see Bark becoming the no-brainer choice for payment backends at bitcoin hackathons. Second conference in a row.

[Carlos Marques @2ndpsy]

Banks make you fill out forms, wait in line, and ask permission to use your own money.

Bitcoin doesn't. And with Ark, it's instant. ⚡

[Matthew Vuk 🛳️ @matthewvuk2]

“Barking Mad” @stutxo

corgi racing game. Bet on the winner tied to the next bitcoin block hash (bet on biscuit 🐕)

“Unilateral exit is a larp” @januszg_

project that moves uneconomical VTXO exits into a bark-powered @CashuBTC mint!

@tabconf @secondhq

[Second @secondhq]

Your agent can now use barkd

[grubles @notgrubles]

https://t.co/cvmlpjzYmx