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# Market mechanics

Proof Market is currently in beta version. We expect there will be continuous changes in it following the feedback we receive from the customers.

Every marketplace has a set of instruments. The market has buyers and sellers for each of these instruments. For example, London Stock Exchange allows users to buy and sell stocks of companies, Binance allows users to buy and sell Bitcoins — these are known as spot markets because you own the commodity.

Exchanges also allow buying and selling a future price of the instrument, like Binance enables users to buy and sell future values of Bitcoin via perpetual contracts. These are called derivative markets, as you do not own the underlying instrument but are just speculating on its price.

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Proof Market belongs to the class of spot markets and is designed as a decentralized and distributed system.Markets tend to arrive at a fair price through interactions between buyers and sellers. In Proof Market, the object of trade are statements — circuits prepared for publishing on the market. Circuits are algebraic representations of an algorithm, created by the proof system and compiled with the zkLLVM compiler. For example, it can be MINA or Solana state-proofs. To publish a circuit to Proof Market, you should build a statement by attaching all additional metadata to the circuit. See the building statements section for more information.

To be traded on Proof Market, the statements will require approval by

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Foundation.The marketplace consists of the following entities:

**Proof requester**— an application like a bridge requesting balance or a user interested in a cross-cluster operation or trustless data access.**Proof producer**— an entity that will generate the proofs for the requests/orders made by the proof requester.

**Buy order**: A buy order is posted by a proof requester. Each buy order comprises the following parameters:**Statement key**— the key of the statement for which this order is placed, like MINA or Solana state-proof circuit.**Cost**(in USD) — the amount that the proof requester is willing to pay for the proof.**Order timeout**(in minutes) — how long an order stays in the order book once it enters the marketplace. The order will be purged if it times out before being matched.**Generation time**(in minutes, optional) — the maximum time the proof producer has to publish the proof once the order is matched.

**Sell order**: A sell order is posted by a proof producer. Each sell order has the following parameters:**Statement key**— the key of the statement for which this order is placed, like MINA or Solana state-proof circuit.**Cost**(in USD) — the amount that the proof producer is willing to create a proof for.**Order timeout**(in minutes) — how long an order stays in the order book once it enters the marketplace. The order will be purged if it times out before being matched.**Generation time**(in minutes, optional) — the maximum time the proof producer has to publish the proof once the order is matched.

In this beta version of Proof Market, a matching engine matches the orders when the following parameters are met:

- cost;
- order timeout;
- generation time.

Order settlement takes place once the proof producer has submitted the proof to the marketplace after its generation.