Hyperledger Besu

Announcing Hyperledger Besu 20.10.0

By Blog, Hyperledger Besu

This release includes new versioning and mainnet-focused advancements

The Hyperledger Besu team is excited to announce today’s Hyperledger Besu 20.10.0 release. 

You might have noticed that the versioning for this quarterly release is a little different than prior Hyperledger Besu releases. The Hyperledger Besu community recently decided to switch its versioning to calendar versioning, known as CalVer. Instead of the historic semantic versioning used by Besu and other Hyperledger projects, the Besu team decided to use CalVer moving forward. In all future releases, you will notice the project versions will start with the year and month (YY.M) of the last major release candidate, followed by a patch number for incremental releases, which results in a YY.M.patch, or 20.10.0 for this release. The Besu team believes this will better track the project’s changes and it follows many other successful open source projects that use Calver, including Splunk and Ubuntu.

Check out the old vs. new versioning in the table below.

ProjectReleaseOld Release VersioningNew Calver Release Versioning
Hyperledger Besu Hyperledger Besu Q4 Release Candidate 11.6.0-RC120.10.0-RC1
Hyperledger Besu Hyperledger Besu Q4 Release Candidate 21.6.0-RC220.10.0-RC2
Hyperledger Besu Hyperledger Besu Q4 2020 Quarterly Release1.
Hyperledger Besu Hyperledger Besu subsequent bi-weekly release

Now to share what is included in the latest release. The Besu community is excited about the continued advancements of the Hyperledger Besu project featured in this release. 

A few highlights for this release include:

  • Flexible Privacy Group Performance tests
  • Mainnet Support Work, including preparing for the Berlin Network Upgrade and EIP-1559 support

Flexible Privacy Group Performance Tests

The ‘add and remove members for privacy groups’ feature was released earlier this year as an early access feature. With privacy groups in Hyperledger Besu, you can add and remove members from a privacy group, creating an improved user experience for private transactions. Privacy groups are built using a private transaction manager, called Orion, to help send private transactions in a permissioned network.

In the 20.10.0 version, privacy groups have been further improved to ensure robust performance. The team performed various tests to ensure the flexible privacy group feature is not a performance bottleneck. 

Flexible privacy groups are now supported when using multi-tenancy. In addition, the team created more library examples and documentation of use cases. 

Mainnet Support Work

Since Hyperledger Besu runs on the public Ethereum mainnet, the Besu community also sought to improve its public chain settings. As a reminder, Hyperledger Besu is the only Hyperledger project that runs on a public chain and in permissioned network settings. This optionality makes it unique and a popular project for trying out both public chain or permissioned network options for a use case.

Berlin Network Upgrade

In this release, the community prioritized work ensuring Hyperledger Besu is ready for the next Ethereum hard fork, Berlin, scheduled to happen in the next few months. You can learn more about Ethereum’s hard forks here. For the Berlin hard fork, the Besu and Ethereum communities are broadly focused on implementing EIPs, or Ethereum Improvement Proposals, that will help with the UX of the Ethereum 2.0 deposit contract, add new functionality to the EVM and change gas costs to reflect their execution time more accurately. 


In addition to its work on the Berlin network upgrade, the Besu team has also been leading efforts to implement EIP-1559. EIP-1559 is a highly anticipated upgrade to Ethereum’s transaction fee market. This EIP’s goal is to make the Ethereum fee market more efficient. You can read more about the current status of EIP-1559 here in a post written by Tim Beiko, one of our Besu team members.

What’s Next?

The Hyperledger Besu community remains committed to improving its project and making it fit for production blockchain use cases. Watch for new features addressing node hibernation and Bonsai Tries database improvements in our next quarterly release.

Get Involved

Download the latest version of Hyperledger Besu here.

Interested in learning more or curious on how to get started with Hyperledger Besu? Check out the Besu docs, view the tutorials, visit the wiki, or take a look at some open issues in GitHub

Stay tuned to hear more about our work in Ethereum and Hyperledger and about how Hyperledger Besu is continuing to lead the enterprise blockchain space.

#HyperledgerFinTech: A sampling of production applications using Hyperledger technologies in the finance market

By Blog, Finance, Hyperledger Besu, Hyperledger Fabric, Hyperledger Indy, Hyperledger Iroha

The financial services market has long turned to technology to address a range of back-end challenges and enhance customer-facing services. Blockchain is increasingly becoming a go-to technology for advancing many different financial systems and solutions with different Hyperledger platforms serving as the core for an array of applications now in production. 

Read on for just a sampling #HyperledgerFinTech solutions, built using a mix of Hyperledger technologies:


Sponsored by the National Bank of Cambodia, the country’s central bank, Bakong is the first retail payments system in the world using blockchain technology. Built on Hyperledger Iroha, Bakong delivers value for customers, merchants and banks. Individuals can now transfer money and buy from merchants with a simple smartphone app. Merchants gain a fast, cashless, and secure payments system. And banks can do interbank transfers at much lower cost.

Bakong was developed by Soramitsu and, after a soft launch in 2019, is now expanding with 16 financial institutions using the system and more expected to join in the near future. The project was also designed to promote financial inclusion for the country’s large number of unbanked citizens. Any citizen of the country can open a Bakong account, even if they don’t have a traditional bank account. The more than 500 merchants that accept Bakong can be viewed in a map inside the app. 


Built atop the private Swiss Trust Chain run by Swisscom and Swiss Post and powered by Hyperledger Fabric, daura is a digital share platform for financing and investing in Swiss SMEs. With daura, the share register is easily digitized and capital increases are carried out quickly and inexpensively at the push of a button. Shares can be split into any number of small lots and the share register is always digitally maintained, complete and up-to-date. With daura, companies have also transitioned virtual Annual General Meetings as a response to COVID-19 with authorization and access are granted directly via the blockchain. 


ioBuilders is a blockchain technology company focused on building regulated fintech and enterprise solutions based on distributed ledger technology to help businesses succeed in their blockchain adoption. The company offers professional services, including technical, business and regulatory, and develops its own product line. ioBuilders has been one of the first adopters and advocates of Hyperledger Besu, providing essential feedback to improve its enterprise requirements capabilities. 

ioCash, one of ioBuilder’s core products, is a fintech platform enabling the use of regulated fiat money on blockchain networks, making it programmable with smart contracts and able to interact with other blockchain use cases. ioCash’s platform operates under an electronic money licence, providing accounts (with or without IBAN) and complex payments functionalities through API and smart contracts connectivity. ioCash is also available as a technology license for financial institutions that hold banking or electronic money licences and are aiming to add the benefits of blockchain into their payment systems. 


CULedger, a credit union service organization (CUSO) that began when a group of credit unions came together in 2016 as a direct response to the increasing threat of fraud, set out to bring a decentralized identity solution product for credit unions to market. The result was MemberPass, a permanent, portable digital identity credential for credit union members.

Built in partnership with Evernym and using Hyperledger Indy, Memberpass replaces vulnerable authentication processes such as common knowledge-based questions. Now credit unions are able to issue a digital credential to members, giving them a hassle-free way to control and prove their identity quickly and easily while protecting their personal information.  


Verified.Me offers a secure and convenient way to help Canadians verify their identities.

Verified.Me is a service offered by SecureKey Technologies Inc. The Verified.Me service was developed in cooperation with seven of Canada’s major financial institutions – BMO, CIBC, Desjardins, National Bank of Canada, RBC, Scotiabank and TD. The Verified.Me network continues to evolve adding new identity providers and service providers to make your life easier.

Verified.Me is built on top of the IBM Blockchain Platform which is based on Linux Foundation’s open source Hyperledger Fabric v1.2, and will be interoperable with Hyperledger Indy projects. 

Users of the Verified.Me mobile app or web browser experience are able to get a free credit score with Equifax, register with Sun Life, verify their identity when registering for Dynacare Plus, an online and mobile service that lets users manage their health remotely, and more.

Join the conversation about solutions and applications in the financial service market with #HyperledgerFinTech this month on social channels. Or get involved with the Capital Markets or Trade Finance Special Interest Groups.

If you are interested in peer-to-peer transactions, mark your calendar for a webinar hosted by CoinDesk at 11:00 am ET on October 20th. A panel of experts on different Hyperledger platforms will be discussing “Governance, standards and interoperability: Getting past the roadblocks to peer-to-peer financial transactions.” Go here to find out more.

Hyperledger Besu 1.5 Performance Enhancements

By Blog, Hyperledger Besu


Over the past quarter, the Hyperledger Besu team has been hard at work improving performance across many fronts, from adding support for native encryption libraries to tuning our EVM execution code, experimenting with different different JVMs and building more robust benchmarking infrastructure. This has resulted in performance improvements across sync times, transactions per second and requests per second.

We are excited to share these results as well as the details of future work we have planned around stability and performance. 

Native Encryption Libraries

When writing Hyperledger Besu (back when it was called Pantheon), we had a principle that the code had to be correct first. If the execution of a block was wrong, it didn’t matter how fast it was because we would fall out of consensus. Combine this with the complexity and specificity of encryption software, and any attempts to optimize performance could have a destructive effect on the whole project if we got even one corner case wrong.  To avoid this, we used mostly pre-existing Java-based cryptography implementations.

Starting in Besu 1.4.2, we shifted our model to use external non-Java or “native” encryption (specifically, external libraries called through native OS calling conventions). This opened us up to a large swath of optimized implementations. The first library we added was secp256k1(AKA the Bitcoin Elliptic Curve). This library is heavily used throughout Ethereum, often invoked multiple times in each transaction. The implementation we use is Bitcoin Core’s optimized library ( It is mostly written in C but also features a handwritten assembly loop in the “hottest” parts of the calculation. The second library we use is for the altbn128 curve, a precompiled contract that has seen a significant uptick in use as Eth2 testnets have started popping up.  

For now, Hyperledger Besu supports both the native versions and pure Java versions, so they are still usable if a native library isn’t compiled for your target device. We split these specific libraries out into a standalone package to simplify the process of building and packaging them for the various platforms on which they must run. They can be accessed on GitHub (

This change has led to a noticeable speedup in fast syncing times (and transactions per second, but more on that below!), especially for networks where secp256k1 verification takes a significant part of the sync time, such as testnets or networks with lots of empty blocks. For example, this change reduced our fast sync time on Goerli by 13%, from 92 minutes (Besu 1.4.0) to 80 minutes (Besu 1.5 RC2). The full sync speedup (processing every transaction and storing every block state) was even larger: a 1,571% improvement, from just over six days (Besu 1.4.0) to just over nine hours (Besu 1.5.0)!

EVM Implementation Optimizations

Another place we improved performance is in our pure Java implementation of the Ethereum Virtual Machine (EVM).  There are three significant improvements of note:

  1. We simplified our exceptional halt detection with simpler language constructs, 
  2. We flattened out a series of three calls into one call and removed a lot of duplicate calculations along the way, and 
  3. We adopted some low-level optimizations that we upstreamed to Apache Tuweni 1.1.

To determine where we needed to perform these optimizations, we used a combination of a handwritten tool and off-the-shelf profilers. The Besu community uses a mix of the VisualVM, Java Flight Recorder/Mission Control, and YourKit profilers (provided to Besu under their Open Source Licencing program –

We then pointed those profilers at a tool we built called “EVMTool” that was initially written to support cross-client fuzz testing of EVM smart contracts. With very slight modifications, we were able to turn it into a repeated EVM executor. Setting the repetitions up to an absurdly high number, we could point our profiler of choice at the EVM and get some longer term performance numbers. This revealed a large amount of unneeded copying of byte arrays, duplicate calculations, and inefficient call structures.

When compared to 1.4.2, our EVM evaluations (i.e., “gas per second”) have now improved from 78-220% depending on the specific contract structure and state size, with all but one benchmark showing over 100% improvement. While we don’t have raw measurements, we suspect this change is also partially responsible for the sync times improvements mentioned earlier.


Since Besu runs on top of Java, we have access to the full range of Java Virtual Machines.  Previously, we have recommended OpenJDK 11 as it is a known and stable version of the JVM with many downstream distributions (Corretto, AdoptOpenJDK, Zulu).

Recently we’ve started testing with GraalVM (, a JVM implementation that is Oracle’s successor to the HotSpot JVM that’s been at the core of Java for over two decades. It is also at the core of several new projects such as Micronaut and Quarkus. While it has lots of fancy features (such as Ruby support, experimental WASM support, native image generation, AOT compilation), it offers several significant performance advantages while remaining a drop in replacement for the JDK. 

Just dropping in GraalVM Community Edition 20.1 without any additional JVM tuning resulted in a 14% increase in our TPS numbers, from roughly 350 to 400 smart contract calls per second.  All the other fancy features it will bring along in the future is just icing on the cake.

Transactions Per Second (TPS)

As mentioned in the prior section, we have seen great improvement to Hyperledger Besu’s TPS numbers in a private chain setting. All in all, our efforts have moved us from 300 TPS on Besu 1.4.0 to 350 for Besu 1.5 and 400 TPS when  using GraalVM. In order to get repeatable measurements for our TPS improvements, we worked with Hyperledger Caliper, another project under the Hyperledger umbrella to benchmark our numbers across various Besu versions. 

The network we used was composed of five nodes. Four of these were validators, and the only non-validator node was used as an RPC node. One of the validator nodes was designated for use as a bootnode.

The network used IBFT 2.0 as its consensus algorithm with a two second block time, an epoch length of 30,000, and a 10 second request timeout value. A very high block gas limit of 672,000,000 was set, and blocks were monitored to be sure that this gas limit was not saturated. The function called to benchmark TPS numbers was a “register” transaction from one of LACChain’s registry contracts. 

All of this was set up using Ansible playbooks we had developed to launch Besu instances. 

Requests Per Second (RPS) 

Another area where we saw notable improvements was in Hyperledger Besu’s handling of JSON RPC requests. Using ethspam (, a library that generates realistic read-only JSON RPC queries to bombard a node with, we saw an 64% improvement in Besu’s request-per-second performance. On version 1.4.0, when sent 100,000 requests, Besu could answer on average 5242.39 per second. Using the 1.5.0 release, that number was up to 8632.75. Even better results were obtained using GraalVM on Besu 1.5.0, with RPS reaching 8988.59, an increase of 71% over the 1.4.0 release!

For our RPS benchmarks, we used Versus (, a tool developed by Infura, which can compare the RPS performance across various Ethereum node implementations and, of course, Infura itself. 

Stay Tuned

While the Hyperledger Besu team is pleased with the progress made, we are continuing to focus on performance and, over the coming months, will make it one of our main priorities for the codebase. Specifically, along with continuing to fine tune various parts of the codebase, we will begin major refactors of two areas of the codebase: the peer-to-peer (P2P) layer and the database.

Besu’s P2P layer has grown and been extended significantly over the past few releases with the addition of privacy, permissioning and various other improvements. It is now time to take a step back to redesign it so that it is maximally stable and performs well. We’ll also be looking to add even more new functionality, such as enabling the new eth/65 version of the eth networking protocol.

On the database side, the Ethereum mainnet’s growing state size has made database access reading and writing state  a major performance bottleneck. Over the next few months, the Besu team will be experimenting with a new database format that is designed to be more performant for networks with large state sizes. The first “feature” coming out of this work should enable users to more easily backup and restore their network’s state, providing an offline disaster recovery backup.

Stay tuned!

Download Hyperledger Besu
Join the Conversation about Hyperledger Besu

IoT Deployment Tutorial Part II: Deploying Hyperledger Besu to Support Hardware Layer

By Blog, Hyperledger Besu

As we pointed out in part I of this series, the days when hardware and software were separate entities are long gone. Along with the ongoing worldwide digitization and digitalization, the integration between the virtual and physical worlds is getting stronger – making the Internet of Things (IoT) a real thing. Going further, we can leverage blockchain features like data immutability, distributed character, and exploit the smart contracts it offers to connect it with IoT applications to build a trusted and all-inclusive solution. We’ve created a two-part tutorial to showcase how to deploy and connect all the pieces. In part I of our tutorial, we set up a private Hyperledger Besu network and configured a Raspberry Pi to sign transactions with its own keys. We used this to write a Python program, hosted on Raspberry, sending Ether to other participants of the network. The final solution used quite a broad technological stack: Terraform, Amazon Web Services, MetaMask, and, finally, Raspberry Pi. In part II, we don’t want to lower the bar, so here we add some extra technological stack on the top of what we had.  


Let us consider a contract between a supplier and a buyer. They both agree on some delivery time, conditions, pick up and drop off locations, and, of course, the price the buyer is willing to pay. Among the conditions, they can agree on some penalty for delayed delivery or that the parcel couldn’t be exposed to a temperature higher than some threshold longer than X minutes. While the delivery time can be verified, the monitoring of the second condition is not that easy to verify. Even if we suspect that the temperature threshold has been exceeded (because, for example, the delivered food is spoiled), how can we prove that transport conditions were inappropriate?

In part II, Ratified Smart Contract for Constrained Delivery with Oraclized Data, we created an automated solution covering the entire supply process, including:

  • publishing the delivery offer with specified conditions, 
  • acceptance of the conditions by contractor, 
  • starting the delivery by an authorized person (using personalized hardware signature), 
  • monitoring the delivery temperature and contract voiding conditions, confirming the delivery, and 
  • calculating the final payment for the supplier. 

To achieve this, we take advantage of the Hyperledger Besu network that was deployed in part I and now write a smart contract on the top of it that handles the delivery operations.


In the full tutorial, we detail all the steps to designing a smart contract for the presented delivery use case. To do this, we use web-based Remix IDE as an environment for contract development while the contract itself is written in the Vyper language. We opted for this pythonic language for the simplicity and readability of its code. Once the contract is developed, we show how to test the deployment to verify that all the functionalities are working correctly.

Further, we go through the steps required to use the hardware signature (contained in the smart card) to sign the transaction, to configure the temperature sensor and measure the current value of the temperature, and, finally, to integrate all the parts into one program that will serve as “delivery starter” and “temperature measurement provider.”

Our tutorial covers a very concrete use case, and it is only the tip of the iceberg. There’s much more, and the possibilities are endless. We hope that this tutorial will give you the thrill to build your own blockchain application. If you have any questions, feel free to contact us!

IoT Deployment Tutorial Part I: Deploying Hyperledger Besu to Support Hardware Layer

By Blog, Hyperledger Besu

The days when hardware and software were separate entities are long gone. Along with the ongoing worldwide digitization and digitalization, the integration between the virtual and physical worlds is getting stronger – making the Internet of Things (IoT) a real thing. Going further, we can leverage blockchain features like data immutability, distributed character, and exploit the smart contracts it offers to connect it with IoT applications to build a trusted and all-inclusive solution.

Of course, step one is to build out a network to support such solutions. We’ve created a two-part tutorial to showcase how to deploy and connect all the pieces. In part I, we discuss the deployment of a private Hyperledger Besu network on Amazon Web Services (AWS) and the minimum configuration of a Raspberry Pi to interact with the deployed network. In part II, we will do a more complex configuration of a Raspberry Pi, making it a physical instance of an externally owned account with an ability to send hardware signed transactions and interact with smart contracts as both signature and measurements provider.

Our goal with part I, Deployment of Private Hyperledger Besu on AWS with Hardware Layer for Externally Owned Account, is to provide an introduction to the topic as well as guidance for getting startedThe tutorial details how to connect a hardware node to the network and configure it to interact with the blockchain. In this regard, it can be treated as a blockchain enabler for IoT solutions.

For a quick overview of the setup, see below. The entire methodology and codebase can be found here.

Setting up the blockchain, accounts and hardware node

First of all, a Hyperledger Besu network should be hosted. For our scenario, we show how to provision a network of four Hyperledger Besu nodes, running an IBFT2.0 consensus, and deployed on AWS. If, like us, you’re not a fan of dull and repetitive tasks, you can use terraform to set the scene instead of manually creating all four nodes.

For general-purpose account management, we use MetaMask – a browser extension that helps to create and manage Ethereum blockchain identities. In the tutorial, we present how to connect to our private, test network, and create a new account – used as an identifier and signature of Raspberry Pi.

Next, we show how to configure Raspberry Pi to:

  • hold its own identity given as a private-public key pair
  • become a part of our private blockchain network
  • sign transactions using its own keys and send ether to other nodes

These steps show how to build a hardware-inclusive blockchain network

Next steps

Getting a handle on the basic ideas and configurations that have to be done in order to have a private Hyperledger Besu blockchain with a hardware node attached is only the beginning. In Part II of our tutorial, we will go beyond merely sending some virtual (and, in fact, worthless) tokens between virtual accounts. We’ll take advantage of the functionalities offered by smart contracts and dive into a business case where the hardware node serves as a trusted source of measurements used to invalidate or finalize a contract. Stay tuned!

Hyperledger-powered Internet of Things applications

By Blog, Hyperledger Besu, Hyperledger Fabric

The Internet of Things (IoT) is driving an array of new distributed technology models and applications. The potential for pairing IoT and blockchain is increasingly a hot topic. This month, as part of #HypereldgerIoT, we take a look at some productions examples where the technologies are already working together. 

Read on for more about Hyperledger-powered IoT applications at work across a mix of use cases:

Norwegian Seafood Traceability Network

A recently launched Norwegian seafood traceability network leverages IBM Blockchain, which is built on Hyperledger Fabric, to share supply chain data throughout Norway’s seafood industry. The goal is to provide safer, better seafood to consumers worldwide. The network uses IoT sensors to report key environmental parameters. Starting with aquaculture, the sensors will monitor and report on the conditions required to produce high quality fish, such as water temperature, oxygen levels, and water quality, and when the fish are transported, IoT sensors will track and report factors such as the length of journey, temperature, and movement in transit. Several Norwegian seafood companies are now in the process of putting data onto the network.

My Sensor

My Sensor is an IoT device developed by Movistar that detects minute concentrations of Radon gas in the surroundings. Radon is a naturally occurring gas which may build up in your property in enclosed spaces, particularly in the basement and on lower floors. If Radon levels exceed certain thresholds, it can affect people’s health.

Leveraging Telefonica’s TrustOS MQTT module, My Sensor tracks and certifies the historical series of Radon gas concentration. The user can get a certification with full proof that guarantees the concentration did not exceed the thresholds in a period or did it during n measurements in a raw. The sensor sent the measurements through TrustOS to a Hyperledger Fabric network where some chaincodes are monitoring and certifying that the measures are in the expected range (or eventually are out of the range). The network itself certifies the series of measurements and anyone can verify it without any doubt avoiding the participation of a trusted expert third party.

VideoCoin Network

The VideoCoin Network is a decentralised video infrastructure that provides developers with video processing services that are simple to use and inexpensive compared to centralised providers. Developed by the VideoCoin Development Association Ltd. and implemented by services provider Live Planet, Inc., the VideoCoin Network runs on the Public Mint platform and is enabled by a native protocol token, the VideoCoin (VID). 

Powered by a large-scale, distributed video infrastructure, the VideoCoin Network marshals under-utilised computing resources from around the world, including IoT devices, to revolutionise enterprise-grade video services with blockchain technology. 

“Public Mint provides a revolutionary and first of its kind money system that lets us use real USD as programmable currency  allowing us to pay tens of thousands of participants on our network. This satisfies our needs to pay anyone whether they’re running a datacenter or a Raspberry Pi IoT device.” – Devadutta Ghat, CTO at LivePlanet Inc.

Backed by Hyperledger Besu distributed ledger technology, Public Mint fosters a marketplace of Smart Services that can run on top of Public Mint’s programmable fiat platform. Anyone can use the current Smart Services or build new ones, using Public Mint’s Open APIs and open-source wallet.

IoT devices integrity service

This service is an extra feature of the Hyperledger Fabric-based TrustOS product. A part of Telefonica’s TrustOS software, this library is provided to be executed by IoT devices in the secure boot. It adds as an additional HTTP header including a checksum of the secure boot for each request sent by the devices.

The first time a device sends this header, TrustOS creates an asset to track any variation in the device behaviour (including besides detecting new checksum, an IA assessing pace and frequency of the requests). Any request is registered and, if something unexpected is detected, a warning is triggered to quickly act over the affected device.

This service can’t avoid unauthorized tampering or unexpected updates but helps in identifying problems earlier and without any doubt. The result: it adds extra trustworthiness-proof beyond KPII.

Join the conversation about blockchain-based IoT applications with #HyperledgerIoT this month on social channels. 

Cover image by Tumisu from Pixabay

Announcing Hyperledger Besu 1.5: Available Now

By Blog, Hyperledger Besu

The latest release of Hyperledger Besu is now available for download. The 1.5 version offers better performance and improved enterprise functionality.

In February, Hyperledger Besu 1.4 was released. Since then, we’ve been concentrating on continuing to bring Hyperledger Besu users the best experience among enterprise blockchain clients. Today, we’re announcing the release of Hyperledger Besu 1.5, which brings with it significant improvements to performance, usability, and privacy.

Hyperledger Besu 1.5 comes with primary upgrades that focus on enterprise requirements.



The most recent set of privacy enhancements include:

  • Ability to add and remove members from privacy groups.
  • Filters and subscriptions for private contracts.
  • Web3j and web3js support for private transactions and filters.

Read more about privacy enhancements in Besu 1.5.


  • Added native encryption libraries to provide optimization optionality
  • EVM execution improvements
  • Improved logs querying performance 
  • Improved transactions per second (TPS) performance by 33%

Look for more details on the improvements in an upcoming blog post.

Parity Tracing APIs

In the Hyperledger Besu 1.4 upgrade, we introduced new tracing APIs as early access features. Since then, we’ve ensured they worked smoothly across every edge case we could find and are now ready to suggest using them by default.

“Hands-on with Hyperledger Besu” is a guided introduction to Besu, hosted by some of the people who build, maintain, train, and work with the Ethereum client. The program is a four-week, detailed introduction to building with the client. Sign up and start learning about Besu today.


The following features are still under active development, may not be documented and have unstable APIs. Nevertheless, because community feedback is valuable to their development, we want to share them as “early access” features. All feedback and questions are welcomed in our contributor chat

EIP-1559 Support
Hyperledger Besu has been one of the clients leading the implementation of EIP-1559, a major upgrade to Ethereum’s transaction fee market. The upgrade will allow better transaction fee estimation and faster transaction inclusion in periods of high demand on the network.  

Ephemeral Testnet YOLO
In preparation for the next network upgrade, Berlin, an ephemeral testnet called YOLO was launched with two new EIPs enabled: EIP-2315, which adds subroutines to the EVM, and EIP-2537, which introduces a new precompile for the BLS12-381 curve.

While the network is currently down (its status can be seen at Hyperledger Besu is YOLO-compatible. 

Download the latest version of Hyperledger Besu here.

Interested in learning more or curious on how to get started with Hyperledger Besu? Check out the Besu docs, view the tutorials, visit the wiki, or take a look at some open issues in GitHub

Those looking to interact one on one with Besu developers and contributors can join the conversation on Rocketchat at #besu, or join our regular contributor calls.

Interoperability and Integration Developments in the Hyperledger Community

By Blog, Hyperledger Aries, Hyperledger Besu, Hyperledger Cactus, Hyperledger Fabric, Hyperledger Grid, Hyperledger Indy, Hyperledger Sawtooth

Interoperability and integration are top of mind issues across the blockchain space right now. From new projects to new solutions, the Hyperledger community is taking on the challenges of cross-chain and cross application communication and data flow. 

Here are some of the most recent #HyperledgerInterop developments from across the community.

New Project – Hyperledger Cactus

The newly announced Hyperledger Cactus is a blockchain integration tool designed to allow users to securely integrate different blockchains. This pluggable architecture helps enable the execution of ledger operations across multiple blockchain ledgers, including Hyperledger Besu, Hyperledger Fabric, Corda, and Quorum available today, with the aim of developers continually adding support for new blockchains in the future. 

 Cactus started as a Hyperledger Labs project six months ago and has attracted significant attention and become a locus of collaboration between developers from teams at Accenture and Fujitsu, and dozens of others working on DLT platforms both inside and outside Hyperledger.

Member applications

  • Smart Block Laboratory built the Hyperledger Fabric-powered distributed register Cryptoenter, blockchain infrastructure for digital banking that unites banks into a single digital space for transmitting financial messages and brings a new level of interaction to the financial market. The platform is designed for p2p interaction between consumers of financial services, safe execution of payment transactions with cryptocurrencies, fiat currencies and cryptocurrencies, user interaction within a social network for investors / distributed crowdfunding platform.

    The basis of the platform is the Rubicon Blockchain, a cloud platform for the blockchain economy, built on Hyperledger Fabric. Cryptoenter has a dual security system: at the Hyperledger blockchain network level and at the Rubicon Blockchain (also based on Hyperledger Fabric) network level. The solution uses an SRP authentication system. TLS (transport layer security) protocol based on SSL (Secure Sockets Layer) protocol is also included. This dual security system allows Cryptoenter to authenticate the person who signed the message, control message integrity, protect the message from fakes and prove the authorship of the person who signed the message.

Technical talks from Hyperledger Global Forum

Nathan George from the Sovrin Foundation offers his take on “Standards and Interoperability for Identity”

 Identity platforms have made significant advances leveraging blockchain technology and standards developed at Hyperledger. In his talk, Nathan covers the latest in trusted information flows and the standards being incubated to promote interoperability and create network effects across multiple blockchains and identity platforms.

Key topics include the advancements incubated in Hyperledger Indy, Hyperledger Aries, the W3C Credentials Community Group and at the Decentralized Identity Foundation for Verifiable Credentials, Decentralized Identifiers (DIDs), DID Communications, Identity Hubs, Authentication, and the data models that power them.

Panelists Rich Meszaros and Sarah Banks from Accenture, Melanie Nuce from GS1 US, David Cecchi for Cargill and Patrick Erichsen from Target discuss “Business Interoperability – The Key to Supply Chain Traceability”

Technology such as blockchain has the power to solve complex challenges and achieve improved supply chain traceability. In order to tap into this powerful technology, interoperability, enabled by robust data and transaction standards, are a must! Segments of the supply chain, such as the food industry, have made significant progress leveraging data standards to support food safety and product transparency use cases. The panelists discuss their companies’ work on improved supply chain traceability, the importance of standards and the role business interoperability plays in accelerating the success of new technologies like blockchain. 

Join the conversation about blockchain-based identity technologies and solutions with #HyperledgerInterop this month on social channels.

Cover image by Clker-Free-Vector-Images from Pixabay

Hyperledger Besu Security Audit 2020

By Blog, Hyperledger Besu


The Hyperledger Besu project underwent a security audit in Q1 of this year. This is the second security audit for the codebase. The codebase had a security audit performed in 2018 prior to the initial launch of the codebase (and when it was named Pantheon). The Besu team conducted another security audit because there have been many new features and functionality added to the codebase since its original security audit. Ensuring security best practices are used in the codebase is a priority for the Besu team.

The Hyperledger Besu team was pleased to partner with Tevora on this security audit and work with them closely on their findings. Tevora’s approach to auditing the codebase included: 

  1. Reconnaissance
  2. Threat Mapping
  3. Known Vulnerability Identification
  4. Exploitation
  5. Post-Exploitation
  6. Reporting

Key Findings and How the Hyperledger Besu Team Addressed Them

When conducting a code audit, it is important to address each finding to help improve the codebase and ensure it meets security expectations. While there were no critical or high issues found in the codebase, there were a couple of medium risk issues that were identified. 

Below is an outline of the issues and the team’s steps to address them:

1) GraphQL Configuration: 

  • Summary of Finding: The Hyperledger Besu client includes a configurable GraphQL endpoint for data queries. Tevora discovered the GraphQL implementation did not adequately protect against malicious queries. If the GraphQL endpoint is served on a routable network interface (a non-default configuration), an attacker could craft a query that exhausts the node’s system resources. This attack would cause over utilization of system resources and the affected node would be disconnected from its peers. A network configured to expose GraphQL endpoints on Besu clients would be at risk of DoS based blockchain attacks.
  • How Team Addressed it: The Besu team immediately began query complexity metering, preventing query loops from forming. Also, as members of the Ethereum community, the team noticed this was a flaw in other Ethereum clients with a GraphQL endpoint so it informed the community so other clients could also implement the appropriate fix. You can find this item resolved in Hyperledger Besu’s 1.4.3 Release.

2) Key Storage

  • Summary of Finding: Besu nodes store the node private key on the host filesystem. Compromise of this key would not lead to a direct loss of funds; however, it would cause a loss of trust in the affected node’s communications. 
  • How Team Addressed It: By design, the Hyperledger Besu team does not store account keys like other Ethereum nodes can be configured to do. This mitigates account takeover attacks. The team is continuing to evaluate how to encourage adoption of best practices for storing node private keys in Besu, including the use of HSMs to store node keys. 

Hyperledger’s Commitment to Security of its Projects

Part of Hyperledger’s role with all of its projects is to ensure security best practices are followed. Activities Hyperledger enforces with its projects to ensure secure codebases include performing security audits, running license checks regularly, and facilitating a security task force with representatives from all project teams. Hyperledger is committed to the security of its projects, and it continues to be diligent about implementing security best practices in all of its projects. 

The Hyperledger Besu team is equally diligent about ensuring security in its codebase, and we believe this security audit was an important step in ensuring its a safe and secure codebase for the community to build on.

“The Hyperledger staff and Besu team were outstanding to work with! Hyperledger takes the security of its projects very seriously and it shows. The response to our primary finding was impressive, with a fix implemented by the Besu team within hours. They are definitely leading by example in the security maturity of open-source software projects.” – Brian Sullivan Information Security Consultant at Tevora.

If you would like to access the full report, you can go here.

Hyperledger Besu Graduates to Active Status

By Blog, Hyperledger Besu

The Hyperledger Besu team is excited to announce Hyperledger’s Technical Steering Committee (TSC) members voted to graduate the project from incubation to active status. The Hyperledger Besu team believes this decision demonstrates the strength of the Besu project and the active community supporting it. With this announcement, Hyperledger Besu joins Fabric, Indy, Sawtooth, and Iroha as projects with active status in the Hyperledger greenhouse and the only Ethereum project to be granted active status.

Since Hyperledger Besu joined Hyperledger in August 2019 under incubation, the Besu team has remained focused on growing Besu’s developer base and making it an inclusive community. The Besu team has had active participation from a number of organizations, including several that have become maintainers of the project. Some of these organizations include ConsenSys, Chainsafe, Web3Labs, Machine Consultancy, Everis, ETC Labs, and MyEtherWallet. Each of these organizations provides critical code to improve and grow the featuresets of the codebase. For example, Chainsafe and ETC Labs focus on maintaining Besu syncing with Ethereum Classic networks, whileWeb3Labs builds the privacy feature. These critical contributions help make Besu the high quality project it is.

Hyperledger Besu’s team has been focused on developing the project to be a leading client for the public Ethereum mainnet as well as in permissioned consortium settings. The Besu team has built enterprise-grade features, including privacy, permissioning, and consensus mechanisms. The optionality of running Besu in a public chain or permissioned chain setting is part of its radical appeal with community members. Now that Besu is an active project, we plan on continuing to encourage enterprises, individual contributors, and application developers alike to explore and support Besu to ensure it continues to evolve to fit each of their purposes. 

What Does Active Status Mean?

By voting for Hyperledger Besu to be granted active status, the Technical Steering Committee acknowledges that Besu meets all of the Incubation Exit Criteria, including legal requirements, high-quality documentation, consistent tooling usage, and diversity of community requirements. Each of these requirements helps demonstrate a project is a safe, welcoming, and vibrant space for community members to join and contribute. By being designated as an active project, Besu is demonstrating that it is meeting Hyperledger’s highest standards for a project.

What is next for Hyperledger Besu?

The next quarterly release, v1.5, is scheduled for mid 2020 and will include our most ambitious features to date. Some features include: 

  • Performance improvements, including block propagation, block product and validation, transaction pool management, and JSON RPC query response time. 
  • Privacy Improvements
  • Beam Sync Early Access
  • Mining Support

Additionally, the Besu team is focused on building out performance metrics using another Hyperledger project, Hyperledger Caliper. The team is looking forward to publishing those results soon.

Hyperledger Besu continues to sit at the intersection of Hyperledger and Ethereum and hopes to continue to grow both communities. We think graduating to Active status is a giant step forward in the project’s maturity.

Do you want to get involved in Hyperledger Besu?

Those looking to interact one on one with Besu developers and contributors can join the conversation on RocketChat at #besu, or join our bi-weekly contributor calls.

Interested in learning more, or curious on how to get started with Besu?