8. The system of claim 7 , wherein the operations further comprise executing one or more nodes of the execution tree associated with inserting a token into the token database.
8. The system of claim 7 , wherein the operations further comprise executing one or more nodes of the execution tree associated with inserting a token into the token database. 9. The system of claim 8 , wherein operations of inserting the token comprise: allocating a head block and a body block associated with the token in the token database; writing to the head block an identifier and the current version identifier, the identifier identifying the head block in the token database; writing to the body block the current version identifier and one or more of a history identifier, a token sequence, a reference, a connection, and a combination of one or more thereof; and linking the body block to the head block.