The ledger system in Hyperledger Fabric uses what database by default

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E. Distributed Ledger. Answer: A,B,E (10) The ledger system in Hyperledger Fabric uses what database by default? A. MS SQL. B. CouchDB. C. LevelDB. D. MySQL. E. PostGres SQL. Answer: A. CouchDBB. LevelDBC. MySQLD. MS SQLE. PostGres SQLAnswer: BExplanation:The ledger system in Hyperledger fabric uses levelDB. By definition, LevelDB allowsconcurrent writers to safely insert data into the database by providing internalsynchronization

Learn Hyperledger Fabric via Questions and Answers Sets

Ledger states are, by default, expressed as key-value pairs, and we'll see later how Hyperledger Fabric provides flexibility in this regard. The world state can change frequently, as states can be created, updated and deleted LevelDB is the default state database embedded in the peer process and stores chaincode data as key-value pairs. CouchDB is an optional alternative external state database that provides addition query support when your chaincode data is modeled as JSON, permitting rich queries of the JSON content By default, fabric uses a LevelDB. This DB holds binary data of Particular object which can be queried using its key. Unlike traditional database being central, Blockchain Database is on every Peer.. LevelDB is the default key-value state database embedded in the peer process. CouchDB is an alternative external state database. Like the LevelDB key-value store, CouchDB can store any binary data that is modeled in chaincode (CouchDB attachments are used internally for non-JSON data)

  1. According to their documentation (http://hyperledger-fabric.readthedocs.io/en/latest/ledger.html) they use LevelDB for storing contract data and CouchDB support is still in beta. Does anyone have any experience using CouchDB in Hyperledger
  2. In Hyperledger Fabric v2.3 there is another way. Instead of beginning at a channel genesis block, now we can take ledger snapshot on a given block of a running fabric network. This snapshot provides all the required information such that it is the starting point for newly added peers in the network. New blocks will be committed in the new peer just as those existing peers
  3. The default state database, LevelDB, can be replaced with CouchDB. LevelDB is the default key/value state database for Hyperledger Fabric, and simply stores key/value pairs
  4. Hyperledger Fabric is a private blockchain network that is set up by organizations intending to create a consortium. The organizations that participate in the construction of the Hyperledger Fabric network are called members. Hedera Hashgraph has recently released a consensus service (HCS) that can be used by Hyperledger to allow time.
  5. Hyperledger Fabric is an enterprise-grade, distributed ledger platform that offers modularity and versatility for a broad set of industry use cases. Rather than a permission-less system where anyone can transact and access data, Fabric offers a permissioned, secure, and scalable platform that supports smart contracts and data privacy. This architecture allows for solutions developed with Fabric to be adapted for any industry, thus ushering in a new era of trust, transparency, and.
  6. The consensus can be at a ledger level (all nodes have to agree) or transaction level (only the transacting nodes have to agree) In case of Hyperledger, consensus is at transaction level, meaning not all nodes need to engage in the consensus mechanism. Only the two transacting parties can engage and arrive at a consensus. Detailed technical explanation of PBFT (practical byzantine fault tolerance) based Hyperledger Fabric consensus is explained in this link
  7. Our engineers built the core codebase of Hyperledger Fabric, which was then contributed to the Hyperledger greenhouse under the purview of The Linux Foundation in 2016. Since then, IBM has remained an active contributor and core maintainer of the open source, open governance project as it became the de facto distributed ledger technology (DLT) framework in the enterprise blockchain space

One option in Hyperledger Fabric(HLF) are private data collections where you can store binary files in CouchDB as base64 text, and just store the checksum/hash onchain, but that would increase storage requirements - based on base64.guru a 20KB pdf in base64 text will be 26KB - probably significant with very large binary files, as well as improper use of a document db This service sends the same data as the Deliver service, and additionally includes any private data from collections that the client's organization is authorized to access. DeliverFiltered; This service sends filtered blocks, minimal sets of information about blocks that have been committed to the ledger. It is intended to be used in a network where owners of the peers wish for external clients to primarily receive information about their transactions and the status of those. The Hyperledger Fabric blockchain can connect food supply chain participants through a transparent, permanent, and shared record of food-origin data, processing data, shipping details, and more. The Chaincode is invoked by authorized participants in the food supply chain. All executed transaction records are permanently saved in the ledger, and all entities can look up this information The Oracle Digital Certificates Solution, built on the Oracle Blockchain Platform (based on Hyperledger Fabric), provides a complete, end-to-end solution for educational institutions to issue verifiable tamper-proof and secure credential certification that improves the student experience after graduation and improves operational efficiency. The solution enables institutions to issue digital certificates along with transcripts and provide self-sovereign capability to the students. Blockchain could be used to maintain the entire supply chain in healthcare. Below is a list of some interesting healthcare applications powered by Hyperledger technology you may or may not have known about: Axuall - Axuall is a digital network for verifying identity, credentials, and authenticity in real-time using the Sorvin Network and.

Two types of World State database currently supported in Fabric include LevelDB and CouchDB. LevelDB is a default key-value database built on Fabric Peer, whereas CouchDB is a JSON-based database.. Build Hyperledger Fabric Network. There is a Build your first network (BYFN) sample installed with Hyperledger Fabric. We will use that to provision a sample Hyperledger Fabric network that consists of two organizations, each maintaining two peer nodes, and a solo ordering service. To do this, follow these steps: 1. Log in as a default user and execute the byfn.sh script to generate certificates and keys for the network The channels supported by Hyperledger Fabric can be deployed as fully disjoint networks with separate endorser sets and ordering nodes to provide privacy and confidentiality. Restricting data replication only to permissioned parties delivers the benefits of the blockchain for data integrity and non-repudiation of transactions, without compromising data security. Reporting requirements—both. Hyperledger Fabric uses Certificate Authority and Cryptogen tool to generate the crypto material for any identity in the network. Cryptogen tool is used only for development purpose but actuall The orderer system channel (sometimes called ordering system channel) is thechannel the orderer is initially bootstrapped with. It is used to orchestratechannel creation. The orderer system channel defines consortia and the initialconfiguration for new channels. At channel creation time, the organizationdefinition in the consortium, the.

Self Balancing Ledger System: Meaning, Diagram, Examples

Ledger — hyperledger-fabricdocs master documentatio

World state database Hyperledger Fabric supports data in multiple different formats TRUE System What is the default programming language used by Hyperledger Fabric? Go Which tool is used to create configuration transactions? Configtxgen Which of the following is a blockchain solution provided by TCS? Quartz The only way to access blockchain APIs is to use a software developer kit (SDK. Result: Enhanced protections for data independent of the operating system. Achievement: Intel SGX can help improve blockchain data privacy in Hyperledger Fabric by encrypting the ledger which helps validate that only authorized parties can see the transactions on the network. IBM's commitment to working with Intel to deliver customers world-class performance and security is the. The Hyperledger Fabric SDK provides a default file system wallet for storing Fabric certificates. The FileSystem wallet stores user certificates in folders. This approach does not provide the required security or flexibility. The security concern with these implementations is in externalizing the associated private key of the identity Hyperledger Fabric (Hyperledger IBM): This project is lead by IBM. as well as any other relevant information stored in the ledger. Hyperledger Indy. Hyperledger Indy is a collection of tools, libraries and further components for digital identities rooted on blockchains. Hyperledger Cello. A blockchain as-a-service deployment model. Besides these framework projects, Hyperledger has several. Private transactions should be used with care in cases where the pattern of private data updates is also sensitive information and could be used to derive the actual private data. Although Hyperledger Fabric architecture prevents unauthorized access to the actual private data, shared ledger participants can still see when a private data (hashed) entry is modified. In the previous example, if a.

Fabric does in fact employ a ledger-type substructure that deploys certain hash linked data stores, though it should be recognized that the configuration of the hashes does not follow the original architectural design affiliated with a blockchain system derived from Bitcoin or Ethereum. While data blobs are batched and undergo deliver events to eventually create a hash link of the transactions. This data is stored in a private database on the peer. The ordering service is not involved here and does not see the private data. Note that setting up gossip requires setting up anchor peers in order to bootstrap cross-organisation communication. A hash of that data, which is endorsed, ordered, and written to the ledgers of every peer on the channel. The hash serves as evidence of the.

Start Developing Hyperledger Fabric Chaincode in Node

Increasing Access To Blockchain And Ledger Databases. Last year, I spent some time in Jakarta visiting HARA, an AWS customer. They've created a way to connect small farms in developing nations to. When an application interacts with the Hyperledger Fabric Network, it uses this identity to authenticate itself. Fabric network validates the identity and authorizes the application to interact. In short, identities are very important and if you don't save them properly, then it may turn into a headache. . Originally published at https://schadokar.dev. Where can I store the Identities. You can use the Hyperledger Fabric on Azure Kubernetes Service (AKS) template to deploy and configure a Hyperledger Fabric consortium network on Azure. After reading this article, you will: Have a working knowledge of Hyperledger Fabric and the components that form the building blocks of a Hyperledger Fabric blockchain network. Know how to deploy and configure a Hyperledger Fabric consortium. Reuseable contracts - Often-used contracts can be standardized for reuse. Auditable contractual agreement - Any contract can be made auditable to third parties. Contract life-cycle management - B2B contracts are unique and cannot always be standardized. An efficient contract management system is needed to enhance the scalability of the ledger.

Hyperledger Fabric was devised to use a different architecture that supports scalability and flexible trust assumptions. By rethinking the notion of permissioned blockchains, Hyperledger Fabric introduces a novel approach that revamps the way blockchains cope with non-determinism and security issues such as resource exhaustion or performance attacks The ledger system contains all the information or changes that happen in the system. Furthermore, all the data changes in the system are called transactions. In the early days of adoption, everyone thought that blockchain is only suited for transacting cryptocurrencies. However, the scenarios have completely changed. Now it can transact a lot more, and it's still evolving

Data for a blockchain solution can either be stored on-chain as part of the core ledger managed by the blockchain protocol, or off-chain, using more traditional data stores. There are several reasons why a blockchain solution may store data off-chain, and this is one of the major considerations that should be decided when architecting a blockchain solution That's why any industry can just use Hyperledger Fabric for any kind of solution. The opportunities are limitless, and businesses will always get the best output from the distributed ledger platform. Even though users within a network system will work together, but the enterprises do need to maintain privacy for certain interactions. It's what the industry is based on. For example, maybe a. Hyperledger Fabric is an open-source, permissioned distributed ledger developed by the Linux Foundation-hosted Hyperledger consortium Ordering Service in Hyperledger Fabric. Update: At the time of writing this article, Hyperledger Fabric (v1.4.1) has just silently launched its new ordering service based on Raft protocol.

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Hyperledger Fabric. Hyperledger Fabric is a modular distributed ledger network that offers developers the highest quality of applications. The best part is that with the help of Hyperledger, you'll get flexibility, scalability, confidentiality, and resiliency I am using Hyperledger Fabric v2.3.1.I am trying to approve my chaincode definition with argument --signature-policy OR('Org1MSP.peer','Org2MSP.peer') instead of the default endorsement hyperledger-fabric hyperledger hyperledger-chaincode. asked yesterday. Delbert. 3 2 2 bronze badges. 0. votes. 1answer 24 views Orderer service raft consensus leader issue. I have a Hyperledger Fabric. You can skip this section to know how Hyperledger Fabric implements this. Kafka is, in essence, a message handling system, that uses the popular Publish-Subscribe model. Consumers subscribe to a Topic to receive new messages, that are published by the Producer. These topics, when they get bigger, are split into partitions, and Kafka guarantees that all messages inside a partition are.

Hyperledger Fabric took a big step forward by adding Private Data Collections to the 1.2 version of Hyperledger Fabric. The concept makes a lot of sense, as it becomes an administrative nightmare. Hyperledger Fabric. Hyperledger Fabric founded in 2015 which is an umbrella for open source projects some of which are Blockchain Distributed Ledger Frameworks such as Fabric, Sawtooth and Iroha. Hyperledger Fabric is a permissioned blockchain, means that parties that join the network are authenticated to participate on network

A Fabric network consists of peer nodes, which execute smart contracts (chaincode), query ledger data, validate transactions, and interact with applications. User-entered transactions are channeled to an ordering service component, which initially serves to be a consensus mechanism for Hyperledger Fabric. Special nodes called Orderer nodes validate the transactions, ensure the consistency of. Hyperledger collabore avec plus de 250 entreprises membres, parmi lesquelles on retrouve des entreprises leader de la finance, de la banque, de l'Internet des Objets, de la gestion de la chaine d'approvisionnement, de la confection et des hautes technologies. Rejoignez vos pairs et participez à construire un écosystème de blockchain pour. This paper designs and realizes a Blockchain-based Time Bank system on the basis of Hyperledger Fabric framework which is one of the permissioned blockchain networks. All of the services provided by existing Time Bank systems were recorded and conducted manually in the past. Also, jobs for matching these services were also managed by people. This way of running Time Bank costs lots of time and.

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CouchDB as the State Database — hyperledger-fabricdocs

Hyperledger Fabric is a platform for building various blockchain-based products, solutions, and applications for business use.; Hyperledger Cello allows blockchain to be used through an on-demand. Hyperledger Fabric is an enterprise-grade, distributed ledger platform that offers modularity and versatility for a broad set of industry use cases. The modular architecture for Hyperledger Fabric accommodates the diversity of enterprise use cases through plug and play components, such as consensus, privacy and membership services

A Managed Blockchain network for Hyperledger Fabric consists of one or more members, and each member has peer nodes with local storage. Additionally, members can write data to the network. You are charged for network membership, peer nodes, peer node storage, data written to the network, and data transfer. The costs associated with shared network components are included in your hourly network. We will use that to provision a sample Hyperledger Fabric network that consists of two organizations, each maintaining two peer nodes, and a solo ordering service. To do this, follow these steps: 1. Log in as a default user and execute the byfn.sh script to generate certificates and keys for the network: $ cd ~ sudo chmod 777 -R fabric-sample Using Cello, blockchain developers can: Build up a Blockchain as a Service (BaaS) platform quickly from scratch. Provision customizable Blockchains instantly, e.g., a Hyperledger fabric v1.x network. Check the system status and manage chains, upload smart contract and test... through dashboards All the nodes have to agree upon a common ledger and all of them have access to all entries ever recorded. In contrast, Hyperledger allows nodes to choose between No-op (no consensus needed) and an agreement protocol (PBFT) whereby two or more parties can agree on a key in such a way that both influence the outcome. This precludes undesired third parties from forcing a key choice on the. Hyperledger Kubernetes deploy using powerful template system - ctlabvn/hyperledger-fabric-k8

What programming languages and databases are suported by

Hyperledger Composer includes an object-oriented modeling language that is used to define the domain model for a business network definition. A Hyperledger Composer CTO file is composed of the following elements: A single namespace. All resource declarations within the file are implicitly in this namespace The service discovery feature, which was made available in the Hyperledger Fabric v1.2, improves upon this approach by ensuring that when an application tries to invoke the chaincode, the peers can compute the network information that they need dynamically without needing to depend on a static network configuration that may or may not have changed since it was provided to the application

Integrating existing systems. Hyperledger Composer can be integrated with existing systems by using a Loopback API. Integrating existing systems allows you to pull data from existing business systems and convert it to assets or participants in a Composer business network Hyperledger Fabric is an enterprise-grade permissioned distributed ledger framework for developing solutions and applications. Its modular and versatile design satisfies a broad range of industry use cases. It offers a unique approach to consensus that enables performance at scale while preserving privacy. - hyperledger/fabric The most fundamental difference between Ethereum and Hyperledger is the way they are designed and their target audience. Ethereum with it's EVM, smart contract and public block chain is mostly targeted towards applications that are distributed in nature. On the other hand, Fabric has a very modular architecture and provides a lot of flexibility in terms of what you want to use and what you don.

Hyperledger Grid is a platform for building supply chain solutions that include distributed ledger components. This project provides a set of modular components for developing smart contracts and client interfaces, including domain-specific data models (such as GS1 product definitions), smart-contract business logic, libraries, and SDKs Hyperledger Fabric v1.4 is a platform for distributed ledger solutions, underpinned by a modular architecture that delivers high degrees of confidentiality, resiliency, flexibility, and scalability. Node.js is an open source, cross-platform JavaScript run-time environment that executes server-side JavaScript code Composer allows you to model your business network and integrate existing systems and data with your blockchain applications. Hyperledger Composer supports the existing Hyperledger Fabric blockchain infrastructure and runtime, which supports pluggable blockchain consensus protocols to ensure that transactions are validated according to policy by the designated business network participants

Blockchain Technology - Distributed ledgers, digital store

Ledger Snapshot in Hyperledger Fabric v2

Hyperledger Composer is an application development framework (ADF) for building blockchain business networks using Hyperledger Fabric framework. It enables business owners and the developers to create smart contracts and blockchain applications to solve business problems. It can be used to model business network including assets and transactions, and, integrate existing systems and data with. Fabric stores data in a leveldb or couchdb, with a separate ledger per channel. Sawtooth stores all data in a central lmdb database with each transaction family using a separate address prefix. Fabric has multiple components, including Orderers, Peers, CAs, CouchDB, and Tools. Sawtooth has the Sawtooth Validator and a Transaction Processor for each Transaction Family. The Validator's REST API. Using Hyperledger Fabric for smart contracts could also be used to automate the tracking of electronic healthcare records, so healthcare providers could confirm patient consent each time they want. Hyperledger Fabric is the most popular of all these projects, so we are going to focus on that in this article. While Ethereum can be used to create projects for B2C purposes, B2b is more of a domain for Fabric. They provide a permissioned blockchain infrastructure providing a modular architecture which we will talk about a little later

Hyperledger — Chapter 6 Hyperledger Fabric Components

The blockchain-based framework, called hyperledger fabric, and its sandbox, called hyperledger composer, are used to develop the proposed electronic health record system. Hyperledger project is the open source permission based Distributed Ledger Technology (DLT). It was developed by Linux foundation to support various smart contracts and logic for implementing multiple applications in the. By using blockchain, parties can share the data, doing away with the need for reconciliation. This is the primary motivation behind the InsurTech firm. Addenda uses the Hyperledger Fabric framework and claims insurance tasks are reported on their system in real-time. Each action is recorded immutably on the blockchain, so any policy changes are. Blockchain Distributed Ledger Technology A New Banking System Foundation. The blockchain is rapidly proving itself to be the ideal platform for experiments in the finance and banking sector. The current wave of innovation and experimentation that is occurring in the fintech sector is opening up a limitless range of opportunities that could. IBM unveiled its Blockchain as a Service today, which is based on the open source Hyperledger Fabric, version 1.0 from The Linux Foundation. IBM Blockchain is a public cloud service that. In a typical blockchain implementation, which of the following is an optional part of a block that contains at least one transaction? c. Transaction data. Honest peer 1 thinks the world state is abc. Honest peer 2 thinks the world state is abc. Honest peer 3 thinks the world state is def. Malicious peer 4 wants everyone to believe that.

How does Hyperledger work and who uses Fabric - The

Applied Data: Blockchain. Advanced 6 Steps 5 hours 30 Credits. Blockchain and related technologies such as distributed ledger and distributed apps are becoming new value drivers and solution priorities in many industries. In this Quest you will gain hands-on experience with distributed ledger and the exploration of blockchain datasets in Google. Banks and accounting systems use ledgers to track and timestamp transactions. The difference is that the blockchain is completely decentralized and an open source. This means that people do not have to rely on or trust the central bank to keep track of the transactions. The peer-to-peer blockchain technology can keep track of all the transactions without the fear of having them erased or lost

Welcome Hyperledger Fabric 2

Currently there is an estimated 800,000+ developers on the Golang language that is used by the consortium network: HyperLedger Fabric — Most of the chaincode (smart contracts built using HyperLedger Fabrics) is written in Golang. They also have a Java SDK for developing blockchain applications Using blockchain, the DOD aims to improve integration, security, auditability, and controlled access of this critical data. ALAMEDA seeks to develop a single system for sharing these sensitive documents by leveraging existing repositories while maintaining the integrity and authenticity of the data Hyperledger 超级账本是一个由Linux基金会主持的,旨在推动跨行业区块链技术的开源合作社区,其中包含多个项目 A Blockchain Platform for the Enterprise¶. A Blockchain Platform for the Enterprise. Enterprise grade permissioned distributed ledger platform that offers modularity and versatility for a broad set of industry use cases. Introduction. What's new in Hyperledger Fabric v2.x Sent by: fabric@lists.hyperledger.org To: Chris Gabriel <alaskadd@gmail.com> Cc: fabric@lists.hyperledger.org Subject: [EXTERNAL] Re: [Hyperledger Fabric] could not build chaincode: docker build failed: docker image inspection failed: Date: Wed, Sep 30, 2020 10:17 PM I blasted prior chaincode. Made sure no doubles of the 'fabric-samples' dir

blockchain - What is consensus in hyperledger - Stack Overflo

Der Begriff Distributed-Ledger-Technologie [Anmerkung 1] (englisch für Technik verteilter Kassenbücher) beschreibt eine Technik, die für die Dokumentation bestimmter Transaktionen benutzt wird.Im Gegensatz zum klassischen Ansatz, bei dem ein Hauptbuch in der Regel von nur einer Instanz verwaltet wird, werden hier dezentral beliebig viele prinzipiell gleichgestellte Kopien des Ledgers von. Suppliers used new labels and used a web-based interface to upload their results. The food traceability framework, based on Hyperledger Fabric blockchain, showed significant results for these PoCs. For pork in China, it enabled vendors to submit authenticity certificates to a blockchain database, adding more trust to a system. The time it took. Hyperledger Fabric | Composer Framework. Hyperledger Fabric is a Distributed Ledger Technology a.k.a. Blockchain technology that has been built ground up with the needs of the Business Blockchain Applications in mind. Composer is a development framework that accelerates the development of Business Blockchain applications of Fabric platform Hyperledger Fabric, a permissioned blockchain infrastructure, as well as Hyperledger Sawtooth, a modular platform for building, deploying, and running distributed ledgers, are both compatible with.

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Seven reasons why Hyperledger Fabric users should use IBM

Oracle Blockchain Platform uses Hyperledger Fabric as its foundation. Use the Hyperledger Fabric documentation to help you write valid chaincodes. Welcome to Hyperledger Fabric. The Key Concepts and Tutorials sections should be read before you write you own chaincode. Go Programming Language. The Go compilers, tools, and libraries provide a. OpenLedger builds innovative blockchain solutions and products for enterprises and various industries. Lower expenses and benefit from blockchain opportunities, such as impressive security level, utmost transparency, optimized and automated procedures and streamlined processes Publish blockchain data using Blockchain Data Manager. What is Blockchain Data Manager for Azure Blockchain Service? Create a Blockchain Data Manager instance using the Azure portal. Watch an introduction to Blockchain Data Manager. Build with the ledger that suits your use case. Deploy a multi-member consortium Proof-of-authority Ethereum network on Azure. Deploy a Hyperledger Fabric.

Adding/Editing General Ledger Journal Entries before PostingA Guide to Bitcoin (Part I): A look under the hoodGarage Storage Project: Shovel Rack | The Family Handyman

Command-line Interface (CLI) To view the currently available CLI commands, execute the following: cd /opt/g opath /src/gi thub.com /hyperledger/ fabric build /bin/ peer. You will see output similar to the example below ( NOTE: rootcommand below is hardcoded in main.go. Currently, the build will create a peer executable file) In a rapidly globalizing digital world, business processes touch multiple organizations and great sums are spent managing workflows that cross trust boundaries. As digital transformation expands beyond the walls of one company and into processes shared with suppliers, partners, and customers, the importance of trust grows with it Data consistency is one of the core features of Distributed Ledgers and is crucial to the problem that Corda is attempting to solve. Let's look more closely into why Corda believes that using a Distributed Ledger will remove the extra time and effort that businesses need to put in to keep data from all parties consistent. When a business or financial institution, a bank for this example. Also, as blockchain uses distributed consensus, it is difficult to alter data on the system without alerting the entire network. This makes the system enormously secure. This makes the system. They use trust by default of a legal contract, or trust by reputation. However, the least common denominator, whether public or private, is the principle of distributed data storage and data verification. This is why the term distributed ledger technology (DLT) emerged as a more general term to describe technologies that have derived from the Bitcoin blockchain. They might be. IBM Blockchain Platform Extension for VS Code. The IBM Blockchain Platform extension helps developers to create, test and debug smart contracts, connect to Hyperledger Fabric environments, and build applications that transact on your blockchain network. For a step-by-step guide on getting started with the extension's features, access our.

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