FAQ

General

What is grin?

• An implementation of MimbleWimble

How is Grin similar to Bitcoin?

• Both are outputs-based, PoW. See also Grin for Bitcoiners

Could grin ever support or make use of... ☑ Probably, or ☐ Probably not

• ☑ Contracts
• ☑ Pruning
• ☐ Identity, like bitauth
• ☑ Something something SNARK/STARK/NIZKPs
• ☑ Cross chain atomic swaps, ☑ multisig, ☑ time locks, ☑ lightning network,
• ☑ Payment channels
• ☑ hidden nodes / onion routing
• ☑ Scripting - clean & native w/ tiny limits
• ☑ Dandelion privacy mixed with tx cut through (already implimented)

Where can I check the block height?

• HTTP GET /v1/chain on a public peer node or see the grin explorers and scanners in the Community Projects section.

Is there a block size limit? Target mean block time?

• Target mean block time is 1 block per 60 seconds. The size is limited by transaction "weight", though there is also a hard cap on the order of tens of MB.

How does grin scale?

• Very well thanks to transaction cut-through!

How do I try Grin?

Where can I build Grin myself?

• Check out the Build Docs

Where can I find Grin wallets

• See this rolling list of community created wallets
• You can also [build] your own node(https://github.com/mimblewimble/grin/blob/master/doc/build.md) and run your wallet through the CLI.

Money and Monetary Supply

Is Grin a stable store of value?

• No. Grin aims to be a useful cryptocurrency that allows people to transact just like they do with cash, but online.

What are the fees and how do they work?

• https://github.com/mimblewimble/grin/wiki/fees-mining and the newer

What is Grin's monetary policy regarding emission rate and block rewards?

• https://github.com/mimblewimble/docs/wiki/Monetary-Policy

Is there a pre-mine?

• No.

Will there be a way to verify proof of payments?

• You can attach recipts or order IDs through the slate that comes with every tx
• Every tx is only known to the sender and the recipient and the network merely verifies that tx are valid. If you're part of a tx you can log that info and use it to prove that a tx is valid and thus definitely happened.

Micro-transactions?

• On Testnet2 fees were 0.8% on a transaction of 1.0 coins.

Mining

What are the requirements for mining?

• A GPU with >3.7 GB of very fast DRAM is the best bet, like the 1080TI. But don't invest Grin-specific equipment yet! There's not even a final beta released, and much can still change.

How does mining work?

• https://github.com/mimblewimble/grin-miner
• https://www.grin-forum.org/t/grin-mining-faq-all-of-the-answers-to-your-mining-questions/71/2

Privacy and Security

How does Grin compare to other privacy preserving zero-knowledge blockchains like Zcash?

• https://github.com/mimblewimble/grin/wiki/Grin-and-MimbleWimble-vs-ZCash

Is Grin quantum safe?

• See this conversation.

Where can I learn more about the privacy preserving properties of Grin?

• See the privacy primer

Contributing

I want to contribute. Where do I begin?

That's great!

• The wiki documentation can always use improvement. Anyone is free to just jump in and edit that directly.
• We also have more technical documentation that is not on the wiki. Here you can’t edit directly, but submit a pull request that is then peer reviewed before merged. A good place to start is to review the technical documentation table of contents and improve where you can.
• If you want to get your hands dirty, you’re also free to just submit a PR to any area of the project, the list of open issues is probably a good place to start. Also check that there are not any open pull requests that conflict to avoid duplication of effort.

How can I understand what's currently being worked on?

• Look at the open pull requests.
• There is a bi-weekly dev meeting every other Tuesday at 21:00 UTC (on odd-numbered weeks) on the /dev channel on Gitter. Feel free to listen in.
• @yeastplume is publishing a weekly progress update of his work in the forum, usually on Fridays.

Roadmap

What is the next big thing happening with Grin?

• Preparing for main net launch! Check out the issues and milestones

When will Mainnet be launched?

• Jan 15th