Distributed order book system

A node of a network of nodes, each node of the network including one or more computing systems for matching offers based on a distributed order book stored at nodes of the network, the node comprising:

• one or more computer-readable storage mediums for storing
• a portion of the distributed order book that includes a pending offer table that includes pending offers that have been published, each pending offer including offeror terms of exchange of an asset;
• an entity offer table that includes unpublished entity offers that are not published by the node, each unpublished entity offer including entity terms of exchange of an asset;
• and
• computer-executable instructions for controlling the one or more computing systems to, under control of the node of the network of nodes:
• receive from other nodes indications of pending offers by offerors to exchange assets;
• upon receiving from another node a first pending offer to exchange a first asset,
• determine whether the entity offer table includes a first unpublished entity offer that matches the first pending offer;
• upon determining that the entity offer table includes the first entity offer that matches,
• send a notification to other nodes that the first pending offer has been fulfilled;
• and
• unless a notification is received from another node indicating that the first pending offer has already been fulfilled,
• remove the first unpublished entity offer from the entity offer table;
• and
• record a first transaction to exchange the first asset;
• upon receiving from another node a second pending offer to exchange a second asset, add the second pending offer to the pending offer table when the entity offer table does not include a second unpublished entity offer that matches the second pending offer;
• upon receiving from another node an indication that a third pending offer is no longer pending, remove the third pending offer from the pending offer table;
• upon determining that a first entity offer to exchange a second asset is to be fulfilled,
• determine whether the pending offer table includes a fourth pending offer that matches the first entity offer;
• and
• when the pending offer table includes a fourth pending offer that matches the first entity offer,
• send a notification to other nodes that the fourth pending offer has been fulfilled;
• and
• unless a notification is received indicating that the fourth pending offer has already been fulfilled, record a second transaction to exchange the second asset and remove the fourth pending offer from the pending offer table;
• and
• one or more processors for executing the computer-executable instructions stored in the one or more computer-readable storage mediums.