Abstract: The present disclosure relates to a trustworthy data exchange. Embodiments include receiving, from a device, a query, wherein the query comprises a question. Embodiments include identifying particular information related to the query. Embodiments include receiving credentials from a user for retrieving the particular information related to the query. Embodiments include retrieving, using the credentials, the particular information related to the query from one or more data repositories that are part of a distributed database comprising an immutable data store that maintains a verifiable history of changes to information stored in the distributed database. Embodiments include determining, based on the particular information related to the query, an answer to the query. Embodiments include providing the answer to the device.

Abstract: The present disclosure relates to a trustworthy data exchange. Embodiments include receiving, from a device, a query, wherein the query comprises a question. Embodiments include identifying particular information related to the query. Embodiments include receiving credentials from a user for retrieving the particular information related to the query. Embodiments include retrieving, using the credentials, the particular information related to the query from one or more data repositories that are part of a distributed database comprising an immutable data store that maintains a verifiable history of changes to information stored in the distributed database. Embodiments include determining, based on the particular information related to the query, an answer to the query. Embodiments include providing the answer to the device.

Abstract: Certain aspects of the present disclosure provide techniques for summarizing data in a distributed system. Embodiments include generating an ordered list of blocks by iterating through a first group of blocks of a hash chain starting at a last block of the hash chain and adding each of the first group of blocks of the hash chain to the ordered list. Embodiments further include generating summary data by applying a summary function to the first group of blocks based on the ordered list. The summary function may take the ordered list as an input and provide the summary data of the first group of blocks as an output. Embodiments further include generating a summary block comprising the summary data and adding the summary block to a summary chain.

Abstract: The present disclosure relates to a trustworthy data exchange. Embodiments include receiving, from a device, a query, wherein the query comprises a question. Embodiments include identifying particular information related to the query. Embodiments include receiving credentials from a user for retrieving the particular information related to the query. Embodiments include retrieving, using the credentials, the particular information related to the query from one or more data repositories that are part of a distributed database comprising an immutable data store that maintains a verifiable history of changes to information stored in the distributed database. Embodiments include determining, based on the particular information related to the query, an answer to the query. Embodiments include providing the answer to the device.

Abstract: Techniques are disclosed for managing encrypted data stored in one or more blocks of a first data structure. One embodiment presented herein includes a computer-implemented method, which includes retrieving the encrypted data from the one or more blocks. The method further includes placing the encrypted data in a container object. The method further includes applying an encryption technique to the container object to generate an encrypted container object and a key. The method further includes generating a second data structure. A first block of the second data structure may include either the encrypted container object or information related to the encrypted container object.

Abstract: The present disclosure relates to generating composite user identities in a distributed computing system. According to one embodiment, an example method generally includes transmitting, to a plurality of identity providers, a request for user identity information. A service provider receives, from a subset of the plurality of identity providers, the user identity information and selects a subset of the received user identity information to be used in verifying an identity of a user based, at least in part, on a reputation score associated with each identity provider in the subset of identity providers. The service provider generates a composite user identity based on the selected subset of the received user identity information. The service provider takes one or more actions to enable use of a service based on the generated composite user identity.

Abstract: Techniques are disclosed for managing a series of blocks in a distributed system. One embodiment presented herein includes a computer-implemented method, which includes dividing the series of blocks into a plurality of groups. The method further includes distributing the plurality of groups to a plurality of processors. The plurality of processors may apply one or more functions to each group of the plurality of groups in parallel. The method further includes receiving, from the plurality of processors, results of the one or more functions. The method further includes merging the results to generate combined results. The combined results may be used in processing data.

Abstract: The present disclosure relates to a trustworthy data exchange. Embodiments include receiving, from a device, a query, wherein the query comprises a question. Embodiments include identifying particular information related to the query. Embodiments include receiving credentials from a user for retrieving the particular information related to the query. Embodiments include retrieving, using the credentials, the particular information related to the query from one or more data repositories that are part of a distributed database comprising an immutable data store that maintains a verifiable history of changes to information stored in the distributed database. Embodiments include determining, based on the particular information related to the query, an answer to the query. Embodiments include providing the answer to the device.

Abstract: The present disclosure relates to a trustworthy data exchange. Embodiments include receiving, from a device, a query, wherein the query comprises a question. Embodiments include identifying particular information related to the query. Embodiments include receiving credentials from a user for retrieving the particular information related to the query. Embodiments include retrieving, using the credentials, the particular information related to the query from one or more data repositories that are part of a distributed database comprising an immutable data store that maintains a verifiable history of changes to information stored in the distributed database. Embodiments include determining, based on the particular information related to the query, an answer to the query. Embodiments include providing the answer to the device.

Abstract: Certain aspects of the present disclosure provide techniques for summarizing data in a distributed system. Embodiments include generating an ordered list of blocks by iterating through a first group of blocks of a hash chain starting at a last block of the hash chain and adding each of the first group of blocks of the hash chain to the ordered list. Embodiments further include generating summary data by applying a summary function to the first group of blocks based on the ordered list. The summary function may take the ordered list as an input and provide the summary data of the first group of blocks as an output. Embodiments further include generating a summary block comprising the summary data and adding the summary block to a summary chain.

Abstract: Techniques are disclosed for managing data of an application. One embodiment presented herein includes a computer-implemented method, which includes scanning a distributed system to identify one or more blocks comprising data associated with the application. The method further includes generating a witness block based on the one or more blocks. The witness block may comprise a state of the data from the one or more blocks. The method further includes adding the witness block to the distributed system.

Abstract: Certain aspects of the present disclosure provide techniques for summarizing data in a distributed system. Embodiments include generating an ordered list of blocks by iterating through a first group of blocks of a hash chain starting at a last block of the hash chain and adding each of the first group of blocks of the hash chain to the ordered list. Embodiments further include generating summary data by applying a summary function to the first group of blocks based on the ordered list. The summary function may take the ordered list as an input and provide the summary data of the first group of blocks as an output. Embodiments further include generating a summary block comprising the summary data and adding the summary block to a summary chain.

Abstract: Embodiments presented herein provide systems and methods for disambiguating the identity of a record to which information imported from a third-party data source pertains. For example, in one embodiment, a record-storage service creates a record of a transaction between a first entity and a second entity. Upon receiving an indication that an instrument will be used to transfer a value for the transaction, the record-storage service associates a code to be printed on the instrument with the record and sends the code to an application that will be used to generate the instrument. Subsequently, the record-storage service receives information imported from electronic records provided by a third-party institution. The information also includes a code provided on the instrument and a status. Upon determining that the code provided on the instrument matches the code associated with the record, the record-storage service updates the record to reflect the status.

Abstract: Techniques are disclosed for managing encrypted data stored in one or more blocks of a first data structure. One embodiment presented herein includes a computer-implemented method, which includes retrieving the encrypted data from the one or more blocks. The method further includes placing the encrypted data in a container object. The method further includes applying an encryption technique to the container object to generate an encrypted container object and a key. The method further includes generating a second data structure. A first block of the second data structure may include either the encrypted container object or information related to the encrypted container object.

Abstract: The present disclosure relates to generating composite user identities in a distributed computing system. According to one embodiment, an example method generally includes transmitting, to a plurality of identity providers, a request for user identity information. A service provider receives, from a subset of the plurality of identity providers, the user identity information and selects a subset of the received user identity information to be used in verifying an identity of a user based, at least in part, on a reputation score associated with each identity provider in the subset of identity providers. The service provider generates a composite user identity based on the selected subset of the received user identity information. The service provider takes one or more actions to enable use of a service based on the generated composite user identity.

Abstract: Techniques are disclosed for managing encrypted data stored in one or more blocks of a first data structure. One embodiment presented herein includes a computer-implemented method, which includes retrieving the encrypted data from the one or more blocks. The method further includes placing the encrypted data in a container object. The method further includes applying an encryption technique to the container object to generate an encrypted container object and a key. The method further includes generating a second data structure. A first block of the second data structure may include either the encrypted container object or information related to the encrypted container object.

Abstract: Certain aspects of the present disclosure provide techniques for managing data in a plurality of nodes of a distributed system. Embodiments include storing, by a node of the plurality of nodes, sensitive data in a block of a hash chain. Embodiments further include determining, by the node, that the sensitive data should not be distributed to other nodes of the plurality of nodes. Embodiments further include distributing, by the node, a limited version of the block to the other nodes. The limited version of the block may comprise a hash and a pointer to a previous block of the hash chain, and the limited version of the block may not contain the sensitive data.

Abstract: The present disclosure relates to generating composite user identities in a distributed computing system. According to one embodiment, an example method generally includes transmitting, to a plurality of identity providers, a request for user identity information. A service provider receives, from a subset of the plurality of identity providers, the user identity information and selects a subset of the received user identity information to be used in verifying an identity of a user based, at least in part, on a reputation score associated with each identity provider in the subset of identity providers. The service provider generates a composite user identity based on the selected subset of the received user identity information. The service provider takes one or more actions to enable use of a service based on the generated composite user identity.

Abstract: The present disclosure relates to a trustworthy data exchange. Embodiments include receiving, from a device, a query, wherein the query comprises a question. Embodiments include identifying particular information related to the query. Embodiments include receiving credentials from a user for retrieving the particular information related to the query. Embodiments include retrieving, using the credentials, the particular information related to the query from one or more data repositories that are part of a distributed database comprising an immutable data store that maintains a verifiable history of changes to information stored in the distributed database. Embodiments include determining, based on the particular information related to the query, an answer to the query. Embodiments include providing the answer to the device.

Abstract: The present disclosure relates to a trustworthy data exchange between a first device and a second device. In some embodiments, a query is received from the second device. The query may comprise a question and an indication of a trusted authority that is to certify authenticity of information used to determine an answer to the query. In some embodiments, information related to the query is determined. In certain embodiments, credentials are received from a user for retrieving the information. In some embodiments, information related to the query is retrieved, using the credentials, from one or more data repositories storing data verified by the trusted authority. In certain embodiments, an answer to the query is determined based on the information. In come embodiments, the answer is provided to the second device. The answer may indicate that the answer is based upon information certified by the trusted authority.