Particle CS Launch app (opens in a new tab)
Particle CS

Building the trust infrastructure for blockchain.

Particle CS develops technology that helps people, teams and software use blockchain with clearly defined authority and enforceable controls.

Our technologyWhat we build
What’s changing

Blockchain is becoming a shared operating environment.

Financial infrastructure is shifting from digital value to programmable participation. More people, more software and more automated systems can now act on the same assets.

HoldersSelf-custody

Individuals holding and moving their own assets, approving every action themselves.

TeamsShared responsibility

Finance, operations and administrators acting on the same accounts.

ApplicationsProgrammable systems

Products and services initiating operations on users’ behalf.

AutomationAutonomous agents

Software and AI agents doing real work with real assets.

Beyond the signature

A valid signature isn’t the whole decision.

A payment can be correctly signed and still go to the wrong place. The same is true of any operation — an amount beyond what was intended, a change nobody approved. As more participants can act, what they’re allowed to do matters as much as who signed.

What a signature provesCan this key sign?Key security and authorization
What it doesn’t decideIs this operation permitted?Authority and the conditions for execution
We don’t replace private-key security.We build an additional layer: security for what a key — or the people and software behind it — is allowed to make happen.
On-chain control layer

Make the rules part of execution.

Every operation starts as an intent — a person, an application or an AI agent asking for something to happen. Before it executes on the blockchain, the controls check who is asking, what they may do and under which conditions.

How the technology works
A chrome cube, a glass gate holding a sphere, and a second chrome cube, in a line from left to right.
IntentControlsSettlement
Bloxchain

A platform to operate. A protocol to build on.

Run governed accounts in the Platform, or build the same controls into your own application with the open-source Protocol. The rules are enforced the same way in both.

Compare the products
bloxchain.app
The Bloxchain Platform Contract security panel: one security change pending, owner, recovery, a one-day time-lock and two of three broadcasters.
Operate in the browser

Bloxchain Platform

A web app for your team’s on-chain accounts. Connect a wallet, decide who can do what, and approve requests in one place. The rules are enforced on-chain.

Explore the Platform →
Install
$ npm install @bloxchain/sdk @bloxchain/contracts viem
From the README · github.com/PracticalParticle/Bloxchain-Protocol
Build it into your app

Bloxchain Protocol

Open-source building blocks for your own smart contracts: roles, approvals and time delays. Add them to your EVM app and manage them with our TypeScript SDK.

Explore the Protocol →
Where it applies

Wherever responsibility is shared.

Treasuries, applications, digital assets and automation — anywhere more than one person or program can move assets or change the rules.

All solutions
Treasury

No payment leaves on one person’s say-so.

One role requests, a separate one approves, and money only goes to addresses on the account’s list.
Team accessShared control without a shared key Application securityYour app’s sensitive functions check who may call them Tokenized assetsControl who can mint, burn and pause your token AI & automationGive an agent a job, not unlimited authority
Services

Hands-on help from the people who build it.

Bring us one real workflow — a treasury flow, a governance change, an agent’s permissions — and we’ll help you get the controls right.

Ways to collaborate
Operation policy designTurn one real workflow — roles, approvals, waiting periods, destinations — into enforced rules, tested against expected and unexpected cases. Protocol integration reviewA review of how your contracts incorporate Bloxchain controls, before you deploy to mainnet. Governance transitionMove from a multisig or single admin key to role-based governed accounts, with recovery planned. Agent permission designScoped roles and limits for AI agents and bots that act on-chain.
Talk to us
The company

Facts you can check.

Particle Crypto Security LTD is the company behind Bloxchain. We list only what you can verify.

About the company

Highlights

Recent work,
on the record.

Audits, media and events from around Particle CS — what others say about our work, and where we show up.

Nethermind Security@NethermindSec “We completed a security audit of @particle_cs’s Bloxchain framework … Our security team reviewed the protocol’s smart contract architecture and implementation.” Audit · View post (opens in a new tab) Length 2:07 Bloxchain@Bloxchain-app Private keys protect who can sign. But they don’t define what that signature should be allowed to do. Video · Watch video (opens in a new tab) Fintech Week Tel AvivTel Aviv “Particle Crypto Security brings deep expertise in protecting the infrastructure that makes this next wave of finance possible.” Event · View post (opens in a new tab)
Explore further

Where would you like to go next?

Read more

All posts
The risk a valid signature doesn’t coverA valid signature proves a key authorized a transaction — not that destination, role or approval path match your policy. Multi-phase security: a practical framework for decentralized operationsSigning, approvals and team wallets each answer part of the problem. Why approvals alone don’t prevent costly on-chain mistakesIf approvals aren’t bound to what the chain will execute, mistakes still ship.