Mina’s zk-SNARKs solve a large scalability problem — the ever-growing blockchain, enabling anyone to run a node using commodity hardware, keeping the network inclusive and decentralized. However, creating those zk-SNARKs (aka proofs) is expensive but Mina’s Snarketplace fixes that. Watch this video or keep reading to learn more.
Two Key Roles In Mina’s Network
Mina, the world’s lightest blockchain, functions with two main roles on the network:
- Block producers are those who produce blocks in the network and create SNARK proofs of the blockchain alongside any blocks they create;
- SNARK workers create zk-SNARK proofs of transactions to compress the transactions so they can be folded into the tiny blockchain proof.
Keep in mind, Mina’s protocol is decentralized and people, also known as nodes, don’t just trust each other to validate the blocks, nor should they! Mina eliminates the need for trust and also incentives the work of creating SNARK proofs by having a marketplace, which we call the “Snarketplace”.
What is the Snarketplace?
The Snarketplace is similar to a marketplace whereby people, or nodes, exchange services for a fee. It revolves around a fixed-size buffer, like a queue or «shelf» of work to do. Block producers add work to this shelf — in the form of transactions that need to be snarked, and then SNARK Workers take the work off the shelf and create SNARKs out of them to process the transactions
To keep Mina a fixed and small size, block producers must purchase completed SNARK work before adding new work to the shelf. In other words, if a block producer wants to move five transactions to the back of the shelf, they must first find SNARKs for the first five transactions in the front of the shelf.
How do SNARK Workers Protect their SNARKs From Being Stolen?
When a SNARK Worker observes some new work to do, they create a transaction SNARK with a special unforgeable digital signature, called a “signature of knowledge.” The signature of knowledge contains the fee that this work is being offered for and information about the wallet address to pay out the fee to.
This digital signature is baked into the nature of the SNARK proof. Attempting to change the public key, as in trying to steal someone else’s SNARK work, would result in crippling the SNARK itself, making the SNARK no longer valid. The only way to earn is to do the SNARK work yourself and offer it on the Snarketplace for a cheaper fee.
Mina Maintains Network Inclusivity
With block producers queuing the new work, and SNARK workers creating proofs in parallel all over the network — any user can participate on Mina using commodity hardware; keeping the network inclusive to everyone.
To find more information about SNARKs, check out our documentation.