Blockchain data queries

This page provide more detailed information about blockchain tables and chained rows by row hash, how the blockchain tables are implemented, managed and how row data is handled in blockchain tables. Blockchain tables are used to implement centralized blockchain applications where the central authority is the Oracle Database. Centralized blockchains provide organizations with more customizability and control, as they can decide who can participate in the network. The participants are different database users who trust Oracle Database to maintain a tamper-proof blockchain of transactions. All participants must have privileges to insert data into the blockchain table.

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Blockchain data queries

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A blockchain index structure based on subchain query

Provide complete provenance and integrity to every piece of data in your system. Traceability of changes are tied to digital signatures for complete proof and visibility into data lifecycle. Read: Why Blockchain Immutability Matters. Link, leverage, and connect information in a rich semantic web of data. RDF Resource Description Format provides instant and lightweight interoperability across disparate systems. Fluree instantly makes data F.

Findable, Accessible, Interoperable, Reusable for smarter information management and enterprise knowledge graphing. Read: Making Data F. Findable, Accessible, Interoperable, Reusable.

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Watch: Data-Centric Security Webinar. Time as a first-class citizen: Fluree timestamps every update by extending RDF to include temporal metadata. Ditch the "update and replace" database for complete historical data visibility. Read: Time Travel with Fluree. Embed an in-memory query server directly alongside your application code for real-time query speeds - with data security and permissions built directly in. Build powerful real-time applications with Fluree's Javascript database and frontend tools that deliver data directly at the edge.

React and NodeJS libraries included. Fluree is a stateless linearly-scalable semantic graph database. RDF data format allows your apps to execute queries across disparate interoperable sources.

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View all Features. Data-Centric Architecture. Download Architecture PDF. Graph Database Query Fluree is a stateless linearly-scalable semantic graph database.

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Google makes public blockchains easily searchable

Emerging ownership models on the blockchain View all 4 Articles. We propose a new platform for user modeling with blockchains that allows users to share data without losing control and ownership of it and applied it to the domain of travel booking. Our new platform provides solution to three important problems: ensuring privacy and user control, and incentives for sharing. It tracks who shared what, with whom, when, by what means and for what purposes in a verifiable fashion. The paper presents a case study of applying the framework for a hotel reservation system as one of the enterprise nodes of Multichain which collects users' profile data and allows users to receive rewards while sharing their data with other travel service providers according to their privacy preferences expressed in smart contracts.

Query & Transact. Secure read/write infrastructure to easily access blockchain data and build robust applications on 30 protocols.

Querying Blockchain Data with GraphQL from a Web Application with URQL and The Graph

This is a step by step guide to help you use The Graph to query Ethereum data in Python. The Graph project is an indexing system for querying decentralized networks. The Graph project uses GraphQL which is a syntax language that describes how to ask for data. GraphQL is about asking for specific fields from an object. The service checks the query to ensure it only refers to the types and fields defined, and then runs the function to produce a result. You can see that the query has the same structure as the result. This is essential to GraphQL and as a result the server knows exactly what fields the client is asking for. To get a better understanding of what The Graph project is and how it works visit thegraph. It explains how to deploy a subgraph and how to query the subgraph for data.

Using Ethereum blockchain to store and query pharmacogenomics data via smart contracts

blockchain data queries

Blockchain, as the underlying technique of cryptocurrency, has triggered a wave of innovation in decentralized computing. Despite some research on blockchain data query, a primary concern for blockchain to be fully practical is to combat the data query inefficiency and query result authenticity. To provide both efficient and verifiable data query services for blockchain-based systems, we propose a Verifiable Query Layer VQL. The middleware layer extracts transactions stored in the underlying blockchain system and efficiently reorganizes them in databases to provide various query services for public users. To prevent falsified data being stored in the middleware, a cryptographic hash value is calculated for each constructed database.

In this video, you'll learn how to query blockchain data from a subgraph in a React application. We'll first give a brief overview of a couple of GraphQL clients, and various ways in which you can query The Graph.

What is The Graph? How Decentralized Queries on Blockchain work

B lockchain transactions are records of interactions between two or more addresses. On the TRON blockchain , there are typically two interacting addresses and the interactions between them can take many different forms e. Each transaction can be uniquely recognised by its hash ID that contains 64 alphanumeric characters. Getting information on a transaction or set of transactions is at the core of blockchain data analytics. This article demonstrates how such information can be collected using the R package tronr , a toolbox to explore the TRON network.

The Graph: Fixing Web3 data querying

Blockchain is a dynamic technology, gaining major traction from various sectors in the market. It became famous in as the fundamental technology powering Bitcoin. However, with passing years application of Blockchain is just not restricted to one financial purpose but multiple ones. With a huge amount of cryptographic data records on Blockchain it becomes difficult to filter and find data on the decentralized platform. To do this, you need to create a key-value index utilizing the distributed Redis database to store the data you extract from a Blockchain platform.

The http query address is needed in your Python code and is the endpoint that contains the blockchain data. This service will execute your GraphQL queries. Use.

The Graph Launches Microtransaction System for Blockchain Data Providers

Covalent provides a unified API bringing visibility to billions of blockchain data points. Our vision is to empower the pioneers of tomorrow by providing the richest and most robust data infrastructure for the entire blockchain ecosystem. Explore and contribute to the absolute richest blockchain data on the internet. Aggregate historical balances, positions and PnL across dozens of DeFi protocols to build rich and compelling interfaces for your users.

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Query Support for Data Processing and Analysis on Ethereum Blockchain Abstract: Blockchain technology has gained immense popularity because many researchers believe that it could solve numerous problems and could be applied in various fields of study. Unfortunately, behind its potentials, blockchain also possessed many challenges and limitations.

Find centralized, trusted content and collaborate around the technologies you use most.

Description of the IT research project: The tamper-proof documentation and traceability of all data changes is of central importance in many application areas. One such application area is audit trails. For this, blockchain technology represents a major benefit compared to traditional database systems, as it ensures verifiable data integrity through cryptographically signed data history. This also ensures that the data read reflects its genuine originality, given the ever-increasing number of hacker attacks with the intention of sabotaging data. As a rule, current blockchain systems are application-based cryptocurrencies or build on an existing database system with a simple data model that only manages the current data state.

Blockchain is still considered new technology, best known for supporting cryptocurrencies such as Bitcoin and Ether. But blockchain can provide security for a variety of purposes, ranging from privacy controls on medical records to preventing vote tampering. Ultimately, blockchain is a secure, encrypted database of agreements.

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  1. Favian

    delighted, respect to the author)))))

  2. Tonauac

    Yes it is logically correct