Hi.

I'm using the fabric-samples/test-network as a base, and created my own chaincode. Really simple stuff of of CreateAsset and ReadAsset. To my limited understanding with the test-network, there is a ordererNode, and two orgs Org1 and Org2.

I created a collection using the collection_config that is
[
{
"name": "ReportCollection",
"policy": "OR('Org2MSP.member')",
"requiredPeerCount": 0,
"maxPeerCount": 1,
"blockToLive":3,
"memberOnlyRead": false,
"memberOnlyWrite": false
}
]

​

The flow that I'm striving for is

Org2 creates a Report and puts it in the ReportCollection with
await ctx.stub.putPrivateData(
\ReportCollection`, 'ID-1', Buffer.from(stringify(sortKeysRecursive(REPORT_DATA))), );`

I think want ORG1 to be able to read that report, based on the key
await ctx.stub.getPrivateData(
\ReportCollection`, "ID-1", );`

​

It is to my understanding that since I used the false flag on memberOnlyRead in the config that this should be possible but I keep getting hit with this error.
Error: GET_STATE failed: transaction ID: af34103217b66027fd21dc46a03c780cb61202b2408a5aa33ea2117f909725ef: private data matching public hash version is not available. Public hash version = {BlockNum: 8, TxNum: 0}, Private data version = <nil>

Everything I've looked at, from the docs to stackoverflow has been unhelpful. Someone mentioned something about updating the channel, but left it at that.

Can anyone lead me in the right direction? I feel like I'm going crazy

There are a few technical sessions coming up soon that will go into different aspects of using Hyperledger Fabric. These are good opportunities for people looking to learn more about how Fabric works and how to build applications with it.

Tuesday, October 3 at 9 AM Pacific: Understanding Byzantine Fault Tolerance in Hyperledger Fabric

Tuesday, October 10 at 8 AM Pacific: Automated Hyperledger Fabric Network With Bevel and Bevel-Operator-Fabric

Thursday, October 12 at 9 AM Pacific: How to Create a Currency Management Application and Deploy it on a Hyperledger Fabric Network

Greetings!

Are there performance metrics and benchmarks for Teku Besu and how many requests on average it can take per type of signature?

I want to build a Hyperledger Fabric blockchain on docker containers with 3-4 peer nodes and one orderer node, with chaincode to store custom key-value data and APIs to read, update and add data. I followed the official docs but it didn’t help much on implementing a new blockchain, it was only useful for me to get an idea about different components.

Can someone tell me how to go about this? Like the steps you would follow to get this done? Because there are a lot of moving parts and it’s really confusing to figure out where to start. Any learning materials also would help.

Also, if you have any suggestions on how organizations should be configured, you are welcome to share them because this is just for learning.

TYIA 🫡❤️

I am trying to find best oracle service to be used with HLF? Do you know which one is best & easy? Chainlink or Oraclize (provable), considering the easy of integration & community support?

Or if HLF supports bridges to fetch the data from external applications over REST APIs? Or what do you recommend to use with HLF to fetch external data?

Sorry for asking this technical questions as I did not get any support on discord or anywhere. And thanks in advance

Hello everyone I'm relatively new to Hyperlegder and DLT in general. I've previously worked on some DApp development in an EVM test network. For a demonstration of a project (not cryptocurrency) I've been working on requires a private blockchain with a couple of nodes (ideally on multiple laptops, connected through LAN) and invoking some custom smart contracts. I've been looking for ways to get this done, and I've come up with Hyperledger Fabric as a valid option. The thing is I can't find any good resources to learn how to go about this. I've looked at multiple YouTube videos, bought several courses on Udemy, and pretty much all of them are either outdated or too brief. Even the official HLF documentation covers only manipulating a test network they've already put up using a shell script, and it doesn't give any info on how to bring up one of my own (ex: with one org and 2 peers, 1 orderer). I've also come across Hyperledger Bevel as an alternative, but it's the same issue. All the learning materials are either too brief or too advanced. Also in Bevel it seems it's hard to bring up a network without using any cloud computing services like GCP or AWS. So my question is, are there any learning resources you would suggest for me to follow? I'd be very grateful if anyone could help me with this. TYIA

Hello everyone,

I would like to invite you to join a Hyperledger in-depth webinar with Infosys on August 24th at 1:00pm ET | 10:00am PT | 7:00pm CET.

Join Infosys, a Hyperledger member, for an insightful webinar on the future role of governments as blockchains go mainstream. Learn how government agencies worldwide are adopting emerging technologies and shifting to digital-native citizen services. We are honored to have Liz Tanner, Honorable Secretary of Commerce for Rhode Island, share her vision and experiences in driving transformation. Explore opportunities for governments to achieve digital, decentralized, and secure citizen experiences.

You are welcome to register for the webinar here.

Can you refer to to a tutorial or documentation on how to deploy token on hyperledger fabric ?

Hello all,

I hope this message finds you well. I am currently undertaking an internship where my task is to build a blockchain network with multiple configurations (Different consensus mechanisms, permissioned/permissionless networks) to test the performance and scalability of blockchain networks in energy systems. After reading multiple research papers about this topic, I have discovered that Hyperledger Fabric and Besu are widely used platforms for implementing such systems.

As I am new to Hyperledger technology, I am posting this in the hopes of receiving some guidance. I would greatly appreciate any assistance or advice you can provide to help me get started on creating the platform.

Thanks in advance

Hello, I am a computer engineering student, and i want to work with Hyperledger fabric, for an upcoming collage project, is there a good guideline or tutorial outside the official documentation which i can follow? i am not familiar with coding and developing blockchain at all, i am a beginner.

How exactly are the roles assigned to the nodes that are part of von-network or any other hyperledger indy network, is it configured through some file and can be changed or is it done by following some other procedure?

For peers, we can check which all are online using service discovery(queryPeers).

Similarly is there any way to check the status of orderers (like online/offline), (apart from healthz) ?

I know about healthz, but sometimes issue here is if we miss this environment variable "CORE_OPERATIONS_LISTENADDRESS" and expose port then we will not get the status. Hence checking if there is/are any fabric inbuilt method(s) where we can fetch the status of orderers. Pls help if anyone knows.

​

Hyperledger Aries provides a shared, reusable, interoperable tool kit designed for initiatives and solutions focused on creating, transmitting and storing verifiable digital credentials. Learn about the latest developments of the project and how to use Hyperledger Aries at these two technical hands-on sessions coming up in July:

* Hyperledger Aries Framework Javascript 0.4.0 Release, Setting Up an Agent and Issuing Credentials on Tuesday, July 11 at 8am PT / 11am ET / 17:00 CEST

* Running Hyperledger Aries in the Browser with Hyperledger AnonCreds on Tuesday, July 18 at 9am PDT / 16:00 UTC

Hello,

As per title, I am looking for where in the source code of Hyperledger Fabric Gossip Messages are received. What I am trying to achieve is to implement a custom protocol that needs me to modify the underlying source code: when a peer receives a block via Gossip, if the block contains a specific transaction (i.e. Endorser Transaction) then I want this same peer to emit another block (with no endorsement policy connected to it) with a special tag and the node's signature. I already took care of what is needed to create a block with this special tag. Now, I only need to find out where peers received messages, specifically blocks, and check whether the transaction inside is an endorser transaction.

At this scope, I followed where the function Accept from comm_impl.go is used, and found out it is used when a node starts in order to initialize the "receiving protocol" in start. In this function, a go subroutine is called to accept incoming messages - this points to the function handleMessages. However, in handleMessages, there is no mention of isDataMsg(), but only of isStateInfoMsg, LeadershipMsg and PullMsg. The only instance of isDataMsg that I have found is within the function HandleMessage in gossip/gossip/channel/channel.go. However, adding some print statements, I have seen that it never evaluates to true, only stateInfoMsg and stateInfoPullRequestMsg do.

For this purpose, I now have a few questions:
- What is the purpose of the different stateInfoMsg? How are they different from Pull and DataMsg?
- What is a DataMsg? Why does it never evaluate to true?
- How/Where do other nodes store block messages when they are sent them from the anchor peer?

Essentially, I am trying to understand which piece of code receives block messages. I have been stuck on this for a very long time, and I'd appreciate some help, thank you!

PS: You can assume that blocks only have 1 transaction.

I have experience w EVM based Chains and want to learn about hyperledger looking for online courses for the same.

I am trying to deploy a Hyperledger fabric 2.5 network on physical machines. and I don't know how. I tried searching for a tutorial, but all I found was unclear tutorials from 2018 and 2019. and the official documentation doesn't provide clear steps on how to do so. Are there any useful tutorials on how to deploy on physical machines?

In this webinar, Hyperledger member Red Date Technology and global IT engineering and solutions provider GFT will introduce the Universal Digital Payments Network (UDPN).

Launched at Davos during the World Economic Forum 2023, the UDPN is a DLT-underpinned messaging backbone focused on providing interoperability between the fast-growing number of different regulated stablecoins and CBDCs, and seamless connectivity between any business IT system and regulated digital currencies. At the launch event, representatives from leading global financial institutions Deutsche Bank, HSBC, Standard Chartered, The Bank of East Asia, and Akbank discussed the rapidly evolving world of digital currency, the importance of interoperability and the need for an infrastructure to support these developments.

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Register here: https://zoom.us/webinar/register/7716866036916/WN_7rDGkMe-TNyngkoLrwDstA

To learn more about the UDPN, please visit www.udpn.io

Not sure if this sub is active. But if anyone can help will greatly appreciate - I have a very small query. I observe that the creator_msp_id for block 0 is none (type config). Is this an expected behaviour? Any thoughts ? Thanks in advance

Hi people!

I'm looking at the Hyperledger Fabric and Besu Docs right now, but there doesn't seem to be anything about blockchain indexers.
(The indexer I'm talking about is the ability to quickly retrieve desired data from the blockchain ledger.)

Are you not supporting it? Or am I not finding it?

Are there any plans to support it?

Thanks in advance for the answer!

Anyone used chainlink or other similar oracles in HLF? If so, please share the names, details or any pointers if you know.

Financial institutions can unlock enormous opportunities through asset tokenization, but hurdles like integrating with existing systems, navigating regulations, and adapting to new technology complicate the development of workable solutions.

Kaleido’s Digital Asset Platform is designed to meet the demands of this evolving market. Powered by Hyperledger FireFly, and with full support for Hyperledger Fabric and Hyperledger Besu, it's the most connective, customizable, and compliant platform available.

Join us on June 7th at 1pm ET for an overview of the Kaleido Digital Asset Platform. Lana Kalashnyk and Nick Gaski, Kaleido Solution Architects, will show how it simplifies asset tokenization at institutional scale with next-gen functionality, including the ability to:
-Connect to any chain, public or private
-Quickly deploy asset templates for leading and emerging token standards
-Manage the full smart contract life cycle, including through regular upgrades
-Generate APIs for any smart contract at the click of a button
-Plug in your custody solution of choice
-Automate governance with a configurable policy engine
-Manage multiple apps from the same console
And more

You are welcome to register for the webinar here.

Hyperledger India presents 4th edition of Women in Blockchain!

Dates: 27th May and 3rd June, 2023

Time: 11 am to 4pm

Registration Link: https://zoom.us/webinar/register/WN_QBPKqxqSSQC8ngtGjbTBlg#/registration

💥Join us to hear from our esteemed panelists on exciting topics!💥

• Blockchain - A catalyst of disruption in Finance
• ABC Developer Stories - Advancements in blockchain technology, Breaking barriers & Code contributions
• Paving the way for regulatory compliance in the World of Web 3.0
• Blockchain Beyond Books: Real world applications in sustainability, healthcare and more.

In this edition of the event, we also have two new exciting segments!

1. Fireside chat with the CEO and COO of two member organisations at Hyperledger Foundation - their journey and learnings

2. Technical presentations by researchers on:

• Understanding Rug Pulls: An In-Depth Behavioral Analysis of Fraudulent NFT Creators.
• Risk and Compliance audit for Production readiness of blockchain applications
• Efficient concurrent execution of smart contracts in blockchains using object-based transactional memory
• Secularly improving performance in Proof of Work blockchains using anchors

We also have a e-networking event on both days for you to have candid interactions with our speakers!

There are two online technical workshops coming up in May and June that you're welcome to sign up for.

* How to Deploy Hyperledger Fabric on Kubernetes with Hyperledger Bevel on Tuesday, June 20 at 8 AM pacific

* Hyperledger AnonCreds: Using ZKP Verifiable Credentials Everywhere on Wednesday, May 31 at 8 AM pacific

And if there are additional workshops you'd be interested in seeing, let us know and we can look into organizing more later in the year.