Meet Grin

the private & lightweight
mimblewimble blockchain

What's Mimblewimble?

Currently Live: Testnet 4 Grin is under development. Launch planned for Jan. 15th 2019.

What's Grin?

Electronic transactions for all. Without censorship or restrictions.

Grin empowers anyone to transact or save modern money without the fear of external control or oppression. Grin is designed for the decades to come, not just tomorrow. Grin wants to be usable by everyone, regardless of borders, culture, skills or access.


Grin has no amounts and no addresses. Transactions can be trivially aggregated. To hide where a newly created transaction comes from, it gets relayed privately (a "random walk") among peers before it is publicly announced.


MimbleWimble leverages cryptography to allow most of the past transaction data to be removed. This guarantees Grin won't crumble under its own weight in the long term.


Grin is developed openly, by developers distributed all over the world. It's not controlled by any company, foundation or individual. The coin distribution is designed to be as fair (but not gratis) as is known to be possible.

Community Initiatives

MainNet, Onwards!

We’re currently hard at work in stabilizing Grin for our mainnet release, around Jan. 15th 2019.

Check out our feature list and jump in.

TestNet 4

Grin’s fourth testnet has been released! We need your help testing: if you’re able to compile from the source, see our building guide.

Crowdfunding the Security Audit

Grin is nearing its final phases of development before the release of its cryptocurrency network (mainnet). To do so safely, the Grin codebase needs to undergo a security audit. We’re soliciting donations:

Read how we're conducting our security audit and status of funding.

Community Funding

Grin is launched fairly, free of ICO, pre-mine or founder’s reward. We rely on donations to keep working on the project. Support the movement by purchasing some swag or making a donation.

Buy Swag


If you’re an individual, company or institution excited about the potential of Grin or MimbleWimble, we humbly ask if you’d consider making a financial contribution to the project’s development. We’re experimenting with a 100% community-driven funding model.

We sincerely thank all our past patrons for their support.