Abstract: A system for auditing event data includes an interface and a processor. The interface is configured to receive an audit query request and a client key. The processor is configured to determine whether the audit query request is valid; determine whether a chain of events is stored in an audit store, wherein the chain of events is associated with the audit query request; and in response to determining that the chain of events is stored in the audit store, provide data for the audit query request.

Abstract: A system for committing event data includes an interface and a hardware processor. The interface is configured to receive modified input data for desired events. The hardware processor is configured to retrieve the desired events from a desired aggregate; select requested event to modify from the desired aggregate; replace input data of the requested event with the modified input data to create a modified aggregate; replay events of the modified aggregate N to generate a new state of aggregate N; and provide the new state of aggregate N.

Abstract: A system for querying a state of aggregate N or creating a projection comprises an interface and a processor. The interface is configured to receive request to query the state of the aggregate N or to create a projection up to a target event and receive a client key. The processor is configured to rehash each event input data of the aggregate N with its corresponding sequence number and a prior event signature to generate a hash value; reencrypt the hash value using the client key to create a check signature; determine whether the check signature is equal to the prior event signature; in response to each check signature being equal to the prior event signature, replay the events of the aggregate N to generate and provide the state of the aggregate N; and in response to a check signature not being equal to the prior event signature, indicate that the aggregate N is not valid.

Abstract: A system for committing event data includes an interface and a processor. The interface is configured to receive input data and receive a client key. The processor is configured to generate an Nth sequence number; determine an Nth event hash using the input data, an N-1 signature, and the Nth sequence number; encrypt the Nth event hash with the client key to generate an Nth signature; generate an Nth event from the input data, the N-1 signature, the Nth sequence number, and the Nth signature; and, in response to an aggregate N-1 of one or more prior events being valid, apply Nth event onto the aggregate N-1.

Abstract: A system for committing event data includes an interface and a processor. The interface is configured to receive input data and receive a client key. The processor is configured to generate an Nth sequence number; determine an Nth event hash using the input data, an N?1 signature, and the Nth sequence number; encrypt the Nth event hash with the client key to generate an Nth signature; generate an Nth event from the input data, the N?1 signature, the Nth sequence number, and the Nth signature; and, in response to an aggregate N?1 of one or more prior events being valid, apply Nth event onto the aggregate N?1.

Abstract: A system for committing event data includes an interface and a processor. The interface is configured to receive input data and receive a client key. The processor is configured to generate an Nth sequence number; determine an Nth event hash using the input data, an N?1 signature, and the Nth sequence number; encrypt the Nth event hash with the client key to generate an Nth signature; generate an Nth event from the input data, the N?1 signature, the Nth sequence number, and the Nth signature; and, in response to an aggregate N?1 of one or more prior events being valid, apply Nth event onto the aggregate N?1.

Abstract: A system for auditing event data includes an interface and a processor. The interface is configured to receive an audit query request and a client key. The processor is configured to determine whether the audit query request is valid; determine whether a chain of events is stored in an audit store, wherein the chain of events is associated with the audit query request; and in response to determining that the chain of events is stored in the audit store, provide data for the audit query request.

Abstract: A system for querying a state of aggregate N or creating a projection comprises an interface and a processor. The interface is configured to receive request to query the state of the aggregate N or to create a projection up to a target event and receive a client key. The processor is configured to rehash each event input data of the aggregate N with its corresponding sequence number and a prior event signature to generate a hash value; reencrypt the hash value using the client key to create a check signature; determine whether the check signature is equal to the prior event signature; in response to each check signature being equal to the prior event signature, replay the events of the aggregate N to generate and provide the state of the aggregate N; and in response to a check signature not being equal to the prior event signature, indicate that the aggregate N is not valid.