---

title: "Let’s dive into comparing blockchain healthcare apps, specifically looking at Hyperledger and Corda. Both are pretty popular choices, but they each have their unique strengths and weaknesses.

First up, we have Hyperledger. It's an open-source project, and it's designed for enterprises that want a robust and flexible framework for building their own blockchain solutions. One of the coolest things about Hyperledger is that it supports multiple programming languages, which allows developers to create tailored applications that meet specific needs. Plus, it’s pretty scalable, which is super important for healthcare where data can get really big, really fast.

On the other hand, we’ve got Corda. This one is more focused on financial services, but it's making waves in the healthcare sector too. What sets Corda apart is its emphasis on privacy and security. It allows for private transactions between parties, which is a huge plus when dealing with sensitive health information. Also, because it’s built with smart contracts in mind, it makes automation a breeze.

So, whether you're leaning towards Hyperledger for its flexibility and scalability or Corda for its strong focus on privacy, both have something valuable to offer in the healthcare space. It really boils down to what you need for your specific application." slug: "blockchain-healthcare-application-development-on-hyperledger-vs-corda" description: "## Your 2025 Buyer’s Guide for CTOs and Product Leaders

Hey there! If you’re a CTO or product leader gearing up for 2025, you've come to the right place for some solid advice. Navigating the tech landscape can be tricky, but don’t worry--we’ve got you covered! Here’s a handy guide that’ll help you make informed decisions when it comes to buying tech solutions that fit your needs and drive your projects forward. Let’s dive in!"

This post serves up clear, up-to-date, and practical advice for CTOs and product leaders deciding when to build healthcare-grade blockchains using Hyperledger Fabric instead of R3 Corda. You'll find solid architectures, handy configuration snippets, and real-world insights that’ll help you make the best choice for your projects." category: "Blockchain Technology" authorName: "Jay" coverImage: "https://images.pexels.com/photos/7567298/pexels-photo-7567298.jpeg?auto=compress&cs=tinysrgb&fit=crop&h=627&w=1200" publishedAt: "2025-11-27T10:13:38.823Z" createdAt: "2025-07-06T08:02:34.438Z" updatedAt: "2026-01-21T08:57:58.645Z" readingTimeMinutes: 11

Blockchain Healthcare Application Development on Hyperledger vs Corda

A 2025 Buyer’s Guide for CTOs and Product Leaders

In this post, we’re going to dive into some straightforward, fresh, and really useful tips on when you might want to choose healthcare-grade blockchains like Hyperledger Fabric over R3 Corda. Let's get into it! We'll be sharing some great architectures, handy configuration snippets, and important compliance checkpoints that are all about FHIR and TEFCA. Let’s dive in!.

Hyperledger Fabric v3. 1 and Corda 5 have definitely changed the game! We've got some cool new features like BFT orderers, the ability to batch write chaincode, REST-first flows, worker-based scaling, and much tighter identity controls. It's pretty exciting stuff! Alright, let’s jump into how you can use these features to create solutions that respect HIPAA guidelines and align with TEFCA, all while making sure they actually get rolled out into production. (hyperledger-fabric.readthedocs.io).

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TL;DR for decision-makers

If you're considering sharing data between different organizations, Hyperledger Fabric is definitely the way to go. It's great for setting up strong policy controls for each dataset, and it makes auditing workflows a breeze--perfect for things like claims, prior authorizations, and provider directories. Fabric v3. Version 1 comes with some pretty sweet performance upgrades, like batched writes, which really help speed things up. Plus, it has improved operational features for orderers, including BFT, which are crucial when you're working at the scale of a healthcare network. Take a look at this: Hyperledger Fabric Documentation. It’s got some great info! If your transactions are mostly bilateral or multilateral and you don’t want to share them with everyone involved--like when you're dealing with things like consent forms, contracts, or data exchanges for clinical trials--Corda is the way to go. If you're looking for privacy right off the bat and want a setup that uses JVM/Kotlin with flows that can be started via REST and scales with Kafka, then Corda is definitely the way to go! More details here: (docs.r3.com).

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Why 2025 is different: new rails you can rely on

The newest update to TEFCA's FHIR roadmap is making waves by highlighting QHIN-facilitated FHIR API exchanges. Hey there! Exciting times ahead with pilots and staged requirements coming out in waves! Just a quick tip for when you're working on your ledger: it's better to link to FHIR endpoints rather than saving FHIR resources directly. Trust me, it'll make things a lot smoother! Make sure to keep a record of those exchanges, too! It's always a good idea to have some evidence handy. Hey, take a look at this link: (healthit.gov). It’s got some interesting info! So, just to keep you in the loop: HL7 FHIR R5 was released on March 26, 2023, along with the Bulk Data IG 2. Pretty exciting stuff! 0 has really clarified the best way to work with large-scale population data by using standardized APIs. Here’s a handy tip: Make sure to tie your blockchain to solid, verifiable origins and get consent, but try to keep the actual records snug and safe in FHIR stores. If you're curious and want to dive deeper into the topic, check it out here: hl7.org. Happy reading!

• Fabric v3. Hey, just wanted to share some exciting news! X has rolled out some awesome updates, like SmartBFT orderers and support for Ed25519 in version 3. How cool is that? You're all set with data that's been updated until October 2023! Plus, you've got the capability to handle chaincode write and read batching in version 3.

1. To cut down on all that annoying endorsement noise when we're doing some important heavy writing. This update is a big win for claims and directory tasks! Definitely check out the details here: (github.com). You won’t want to miss it! Corda 5 has made some cool changes by introducing a worker-based architecture. This new setup includes flow workers, uniqueness workers, crypto workers, and persistence workers, making everything run more smoothly! It runs really well on Kubernetes and uses Kafka in the background, which makes it perfect for those private workflows that need to be super reliable. Learn more here: (docs.r3.com).

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Fabric vs Corda at a glance (2025)

• Data Distribution Model
• Fabric: Imagine it like a channel-based broadcast that lets you have super precise control with Private Data Collections (PDCs). Basically, orderers only get a glimpse of the hashes for the private data, while PDCs can tidy things up for themselves with the blockToLive feature. It's pretty handy! It’s just right for that kind of governance where some folks get the full picture, while others only catch a glimpse of what’s happening. ” (hyperledger-fabric.readthedocs.io).
• Corda: So, Corda really focuses on peer-to-peer flows. This means that only the people directly involved in a transaction can see the details. Pretty neat, right? Notaries play a key role in ensuring everything stays unique by preventing double-spending and managing transactions within set time limits. This way, there's no chaotic global state being shared all over the place. (docs.r3.com).
• Getting on the Same Page and Dealing with Mistakes.
• Fabric: You’ve got the option to go with either Raft (CFT) or SmartBFT (Byzantine) orderers. SmartBFT was introduced with version 3. You're up to date with all the info from before October 2023, and we’ve made some cool updates in version 3.

1. 1 and v3.

1. BFT has really stepped up its game in terms of stability and operations lately! If you're facing trust issues with your orderer operators, I’d recommend going for BFT. It’s a solid choice! You can find all the details right over here! Take a look!

• Corda: So, here’s the deal with notary clusters--if you ask me, the non-validating ones are the way to go. They help keep everything unique and make sure everything gets a proper time stamp. It's pretty neat! For everything else, all you really need is to get those signatures from both parties to seal the deal. If you want to dive deeper and get more details, check this out here!
• Developer Model
• Fabric: You’ve got the option to work with chaincode in Go, Node, or Java. So, pick whichever one you’re most comfortable with! The new v3. The latest update comes with some awesome new features! You can now take advantage of write/read batching APIs and composite key pagination, which are definitely going to make things faster in those big keyspaces. If you want to dive into the details, just click here. You’ll find all the info you need!
• Corda: So, Corda is built on the Java Virtual Machine (JVM) and you can use either Kotlin or Java with it. It works by using states, contracts, and flows to get things done. You can start flows using REST, and it’s powered by Java 17. On top of that, the workers are packaged as container images specifically made for Kubernetes and Helm. If you want to dive deeper, check out the docs right over here. They're packed with useful info!
• Identity & Crypto
• Fabric: Basically, it's the MSPs who are in charge of creating those trust domains. With Fabric CA 1.

5. Version 15 brought some cool upgrades to the default auth headers! Oh, and by the way, if you're using version 3... Hey there! Just a heads up, you can now start using Ed25519 keys. Pretty cool, right? Thinking about HSMs? No worries, they're totally optional! If you're curious and want to dive deeper, just click here for more info. Happy exploring!

• Corda: When it comes to Corda, we’re focusing on X. 500 identities. They’ve got your back with secure identities that are supported by Hardware Security Modules (HSMs). Oh, and by the way, mTLS is everywhere these days! Seriously, it's worth considering using external secrets services as well. If you're looking for more details, just click here. It’ll take you right to the info you need!
• Licensing
  Alright, here’s the deal: both Fabric and Corda runtime OS are running under the Apache 2 license. 0 license. Just a heads-up, the way enterprise distributions and support models work can really vary from one vendor to another. Take a look at this: (github.com). You might find it interesting!

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Design patterns we recommend in healthcare

1) Claims and prior authorization audit (Fabric)

When you've got a mix of payers, providers, and clearinghouses all teaming up to handle workflow, having reliable evidence is super important. Alright, let me break it down for you:

• If you want to increase visibility across various organizations, try using a shared claims channel. For any sensitive attachments or pricing details, it’s best to manage them with per-payer PDCs. It’ll keep things organized and secure! Just a quick reminder: if you're dealing with anything that looks like PHI, don’t forget to set blockToLive. Also, make sure to keep those hashes recorded on the ledger for auditing later. It’s all about staying on top of things! If you want to dive deeper, feel free to explore the Hyperledger Fabric documentation for all the details you need!

So, when you're dealing with chaincode keys, make sure to follow these formats: claim:{payerId}:{claimId} and preauth:{payerId}:{requestId}. It’s pretty straightforward, and sticking to these formats will keep things running smoothly! Hey, just a quick reminder--when you’re checking in on your status queries, make sure to set up those composite indexes. They can really help optimize your performance! If you're using v3. You can totally make the most of batch writes when you're dealing with those high cardinality submissions. When it comes to chaincode, go ahead and utilize StartWriteBatch along with FinishWriteBatch. Also, don’t forget to enable read batching by setting chaincode.runtimeParams.useGetMultipleKeys to true. This will help streamline your operations! If you’re looking for more details, check out the release notes. They'll have everything you need to know!

If you’re dealing with orderers in organizations that don’t really trust one another, it’s a good idea to roll out SmartBFT. If that doesn't work, why not give Raft a try? The newest Fabric update, v3, should have you covered!

1. I tackled a few annoying edge cases with SmartBFT, such as those pesky view change deadlocks and some memory leaks. Check it out on the New Releases page! You’ll find all the latest info there.

• And finally, when it comes to operations, don’t forget to use the Channel Participation API. It's a great tool for automating those channel lifecycle tasks and making your life a little easier! With v3.

1. Hey, guess what? They've rolled out some cool new features! You can now update configurations using PUT, and they’ve also added block fetching. If you want to dive into the specifics, just click here. Enjoy exploring!

Here's the scoop: Fabric is at the heart of the healthcare claims system over at Change Healthcare. It processes a staggering number of events--think tens of millions--each and every day! And you know what? Even if your workload isn't huge, those deployment patterns have already been tried and tested out there in the real world. Take a look at this for yourself: lfdecentralizedtrust.org. You won't want to miss it!

2) Patient consent as a verifiable state (Corda)

So, when you're trying to find those bilateral consent handshakes--whether it's between a patient and a provider or a provider and a research sponsor--there are a few key things to remember.

Imagine modeling consent like a Corda state. You essentially set up the participants as the people who get to be the data holders and have access to it. It’s like creating a little club where only certain members can see and use the information. Make sure to include terms like scope, purpose, and expiration right in that statement. Just a quick reminder: notarization helps ensure that there’s only one active consent for each specific scope or time period. (docs.r3.com).

Hey, have you thought about checking out a non-validating notary cluster? That’s what we call Corda 5. It could really help you keep track of uniqueness and timestamps in a smoother way. You can easily get this going by using the notary CPB/CPI onboarding process. (docs.r3.com).

• To make your flows easy to kick off, use ClientStartableFlow. This way, your downstream applications can effortlessly trigger consent grants or revocations using HTTPS. Corda handles flow and session deduplication along with checkpointing, so you don't have to worry about it! (docs.r3.com).

If you’re handling sensitive legal agreements, it’s smart to keep your keys safe with HSM-backed confidential identities. Corda’s got you covered with wrapped modes to handle this! (docs.r3.com).

When it comes to scaling, consider setting up a bunch of flow and uniqueness workers behind Kubernetes services. Plus, using Kafka can really help with smooth, partitioned processing. It’s a solid way to manage everything! This is going to boost performance quite a bit! You can check out more details here.

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FHIR- and TEFCA-aligned data handling (don’t put PHI on-chain)

Make sure to keep your personal health information (PHI) securely tucked away in your FHIR systems. It’s a good idea to use hashes, ETags, and signed pointers on-chain to protect everything. So, according to the HHS HIPAA guidelines, you’ve got a couple of options for de-identification: you can either use the Safe Harbor method or go with Expert Determination. Just remember, whatever route you take, the risk of re-identifying someone needs to be “very small.” Hey, if you're curious and want to dive deeper, you can find all the info right here. So, if you're dealing with population exports, make sure to tap into those FHIR Bulk Data (Flat FHIR) flows. And don't forget to jot down an event in your ledger! You'll want to include the export manifest URL, the checksum, who’s making the request, and the consent status. Trust me, keeping track of all this stuff will save you a headache later on! If you’re looking for more details, just check this link out here. It’s got everything you need! When it comes to TEFCA staging, make sure to focus on QHIN-facilitated FHIR for now. It's also a good idea to stay updated on how QHIN-to-QHIN FHIR evolves over time. Just a heads up--it's important to have your blockchain set up to track requests and responses, as well as what each participant claims. This way, you can easily support audits and have safeguards in place to protect against any potential information blocking. Get the scoop here.

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Privacy and data minimization features that actually help

• Private Data Collections in Fabric.
• Make sure to establish PDC policies for every dataset. Just a heads up, only the hashes will be passed along to the orderers. Hey, just a quick reminder to use blockToLive for automatic purging! It really helps keep things tidy. This method really sticks to the “least data necessary” rule, all while making sure we maintain the evidence we need. (hyperledger-fabric.readthedocs.io).
• Corda point-to-point transactions
  So, in this setup, it’s really just the participants who get their hands on the payloads. The notary? They’re only checking out a small slice of the transaction details. You can totally pair this with reference states for policy documents, like consent templates, and still keep them intact. Take a look at this: (docs.r3.com). You’ll find some really useful info there!
• De-identification and retention
  Just a quick reminder to use those HIPAA de-identification methods, like Safe Harbor or Expert Determination. They're super important for keeping things private and secure! If you absolutely have to keep those identifiers off the blockchain, I’d recommend using salted one-way hashes on the ledger. Just make sure to keep the mapping for re-identification in a space that’s compliant with HIPAA regulations. It’s all about keeping things secure and private! If you want to dig deeper into this topic, just click here for more information!

Emerging Research: PIR-Style “Private Reads” for Fabric’s World State

There’s some really exciting new research popping up about PIR-style “private reads” for Fabric’s world state.
This method is really shaping up to be quite effective, especially for cutting down on latency with those small, sensitive datasets. It's not quite ready for prime time, but definitely keep an eye on it if you're serious about privacy for your heavy queries. Feel free to take a look at the details right over here.

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Interoperability across networks (when your ecosystem isn’t homogeneous)

Check it out! Hyperledger Cacti and Weaver have some pretty neat ways to share data between Fabric and Corda. They've built in authenticity proofs and even have atomic asset exchanges to keep everything running smoothly. If you're collaborating with a group that uses various distributed ledger technologies or if you need to link up with financial systems, you should definitely take a look at these tools. They can be super helpful! (hyperledger-cacti.github.io). R3’s Harmonia, which is part of the Hyperledger Lab, focuses on helping regulated networks communicate seamlessly with one another. This is definitely something worth watching! Those cross-network settlement features could really shake things up for healthcare payments in the future. (businesswire.com).

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Concrete architectures you can ship in 2025

A) Prior authorization transparency network (Fabric)

• Channel layout
  Hey there! Just wanted to let you know that we've created a channel called "pa-net" for payers, providers, and UM vendors to connect. Plus, there's a dedicated PDC channel named "payer-{id}-util-review" for each payer to keep their sensitive notes organized and secure. If you want to dive deeper into the details, just head over to this link. You’ll find a lot of useful info there!
• Chaincode API
• For our API, we're going with: Sure! Here’s an example of what you might write:

"Hey, to submit a PA (Prior Authorization), you'll need to provide a few details: the request ID (reqId), the FHIR claim reference (fhirClaimRef), the patient reference (patientRef), the payer ID (payerId), the provider ID (providerId), the clinical bundle hash (clinicalBundleHash), and the consent reference (consentRef)." Sure! Here’s a more casual take on that:

So, we have this function called AdjudicatePA. It takes in a few things: reqId for the request ID, status to show where we stand on things, reasonCodes[] which is a list of reasons, and then attachmentsHash[] to handle any attachments. Pretty straightforward, right? Hey there! Just wanted to let you know that we're excited to introduce write-batching for attachments and key fan-out in version 3. Can't wait for you to check it out!

1. Find out more here.

• Operational guardrails
  Just a heads up--if you've got multiple payers using orderers, SmartBFT orderers are going to be super useful for keeping things secure. Also, we’ll be tapping into the Channel Participation API for those dynamic joins, and we’ll double-check that we’re running Fabric CA version 1 or higher.

5. 15 is here to help you keep those authentication headers nice and secure! If you’re looking for more details, you can check it out here. It should have everything you need!

• Audit evidence
  So, every time an event shows up in the ledger, it's going to come with a bunch of important stuff. You’ll find the FHIR Claim/PA bundle URL, an ETag, TEFCA/QHIN transaction IDs, and even the consent state hash. Pretty handy, right?

B) Patient‑mediated research consent (Corda)

• States
  Alright, so here’s the deal: we’ve got a ConsentState that includes a few key pieces of information. It’s got the patient info, the data holder, the scope of what’s covered, a hash of the terms, and when it all kicks in from. Just remember these elements when you’re working with it! That's where the real magic happens! The issuer gives it the green light, and then the notary comes in to make it special by linking it to the patient and defining the scope. For more info, just check out the details on docs.r3.com. You'll find everything you need there!
• Flows
  So, we’ve got two flows here: GrantConsentFlow, which is a ClientStartableFlow that's set up to work with REST, and then there's RevokeConsentFlow. The responder plays a crucial role here by double-checking the terms and ensuring that everything gets recorded accurately. We’ve also established specific time frames to make sure that grants get notarized within the target service level agreement. For all the details, take a look at the full scoop over at docs.r3.com. You’ll find everything you need to know there!
• Security
• Thanks to HSM, we keep our identities under wraps, and we always switch up the keys for every study. We also use an external secrets service to manage our master wrapping keys. If you're looking for all the details, just swing by docs.r3.com. You'll find everything you need there!
• Integration
• So, there's a little shout-out to the FHIR server that we use to create a Consent resource. We're keeping an eye on the Consent.id and ETag in our state. Whenever there's any interaction that happens further down the line, we make sure to reference the consent using StateRef.

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Performance and scale notes (realistic, not hype)

• Fabric
  So, if you’re working with a bunch of key writes in a single transaction--like when you're handling a claims batch--that’s where v3 really shines. Using 1's write batching can definitely make things a whole lot smoother. It helps reduce those back-and-forth trips to peer-chaincode, which saves time and effort. You might want to give Hyperledger Caliper a shot to see how it performs in terms of latency and throughput in your cloud setup. It’s a great way to get a feel for how everything’s running! Take a look at this: (hyperledger-fabric.readthedocs.io). It's got some cool updates you won't want to miss!
• It's not all just talk! Take Change Healthcare, for instance--they're a perfect example of this in real life. They've shared that they're managing a whopping 50 million events every single day, all thanks to their Fabric-based system for handling claims. Pretty impressive, right? That's a pretty strong example of how effective this can be in real-life situations! Check this out: lfdecentralizedtrust.org. It's pretty interesting!
• Corda
• The worker model can be easily scaled out as needed. So, when it comes to uniqueness workers, they’re the ones in charge of keeping an eye out for any double-spending issues. Meanwhile, we’ve got the flow mapper and flow workers who are busy taking checkpoints. This is super important for making sure everything stays stable, especially when the system needs to restart. When you're working with Kubernetes, you can look forward to a setup that increases by the number of workers. It’s all about scaling out as you add more workers to the mix! (docs.r3.com).

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Security, compliance, and governance checklist

• First things first, make sure to avoid putting any PHI directly on the ledger. Instead, go for hashes, pseudonymous IDs, or de-identified aggregate data. Hey, don't forget to double-check the HHS de-identification guidelines--like, the Safe Harbor and Expert Determination stuff. It'll really help you stay on the right track! If you want to dive deeper into this topic, you can check out more details here. Trust me, it'll give you a better understanding!

Hey, just a quick reminder to make sure you get those Business Associate Agreements (BAAs) signed with any cloud providers that are handling your peers, orderers, or workers. It’s super important to keep everything above board! Keeping your logs organized within your HIPAA boundaries is really important, too!

Hey, just a quick heads up! If you’re following the HITRUST roadmap, make sure your controls are aligned with the latest CSF v11. It's important to stay updated! 5. No updates here--just a heads up about backups and some fresh, reliable sources. If you want to get into the details, you can check it out here!

• Let’s chat about crypto and keys. When you're working with Fabric, make sure to turn on Ed25519 whenever you can. It's all about keeping those MSPs nice and tidy. Don't forget to switch up your certificates regularly too--it's a good practice! And if you're feeling adventurous, you might want to consider using a Hardware Security Module (HSM) for your CA keys. It could really boost your security game! If you’re looking for more details, just check this out here. When you're working with Corda, it's a good idea to think about using HSM-backed confidential identities. Don't forget to keep any secrets you have outside of the network, and definitely enforce mTLS from start to finish. It's all about keeping things secure! If you want to dive deeper into the specifics, just click here. Happy exploring!
• Finally, when it comes to getting ready for TEFCA, don’t forget to keep track of your FHIR transactions using QHIN identifiers and signatures. It’s a small step that can really help! Just a heads up to keep an eye on the staged FHIR enablement. Also, make sure your ledger schemas are flexible enough to adapt.
  If you're looking for more information, check this out here. It's got some good guidance that might help!

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How to choose: practical heuristics

If you can relate to most of these statements, then Hyperledger Fabric might just be the right fit for you:

So, you've got at least five different organizations that need to team up to handle some common datasets. The catch? Each of them has their own set of guidelines for how to read, write, and keep that data. It's really crucial to have audit events that everyone can take a look at, while also keeping some private subsets (PDCs) around for dealing with sensitive info. So, you’re in the market for BFT ordering, right? It makes sense given that trust in the orderer isn’t exactly sky-high within the consortium. (github.com).

If you can relate to a bunch of the following points, then Corda might just be the perfect fit for you:

Transactions usually involve two parties or sometimes even more, so it doesn’t really make sense to just blast them out to everyone. If you're after that super tight "need-to-know" vibe when it comes to privacy, plus a guarantee of uniqueness and timing backed by a notary, you've come to the right place! Hey, take a look at this link for all the details: docs.r3.com. It's got everything you need to know! Your team is really into Kotlin and Java and they totally dig working with REST-startable flows. On top of that, you'll be running everything on Kubernetes, and you'll be using Kafka too. Sounds pretty cool, right? If you want to dig deeper, check out this link for more details: docs.r3.com. It’s got all the info you need!

So, if you're diving into a mixed ecosystem, I’d suggest starting with Fabric to get a solid network audit going. Once that’s sorted, you can bring in Cacti and Weaver patterns to help make sure your Corda-based applications play nicely together whenever you need them to. It’s all about keeping everything running smoothly! If you want to learn more, check it out here!

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Build and run: emerging best practices we use at 7Block Labs

• Fabric
  Feel free to check out Bevel or something like it to simplify your Kubernetes deployments. It’ll definitely help make things smoother and more reliable! Just a heads up, don’t forget to keep an eye on the v3! So, you've got these images, right? They're all part of Ubuntu 24. You're all set up with the 04 base and the Channel Participation API for handling your operations. If you're looking for more details, just click here. It’ll take you to all the latest updates! If you're working with PHI-like data, make sure to configure the PDC by setting the blockToLive. Make sure to hang on to the full payloads in FHIR and keep them archived for the entire duration of their lifecycle. If you want to dive into the details, just click here. You’ll find everything you need!
• Corda
  When you're getting things set up, try to find that sweet spot with your team. Let's kick things off with three flow workers, three uniqueness workers, and two crypto workers. Sounds like a solid plan, right? When you start feeling the strain from the partitions, just scale up as needed. Hey, just a quick reminder to double-check that everything's set up with Java 17 (Azul Zulu) like R3 suggested. Thanks! If you want to dive deeper into the details, you can check it out here. You know, it's pretty smart to have your notary set up on its own separate trust domain. Choose a non-validating protocol, and make sure to sync your time windows with the business SLAs. It's important to keep everything in line! If you're looking for more details, you can check this out here. It’s got everything you need!
• Interop
  Hey, it’s a good idea to set up a Weaver relay between the Fabric and Corda testnets pretty early in the game. This way, we can reduce risks for those cross-network scenarios like audit proofing and atomic exchanges. Trust me, getting this sorted out early will save us a lot of headaches later on! Take a look at this link: (hyperledger-labs.github.io). It’s got some great info!
• Benchmarking
  Hey, take a look at Hyperledger Caliper! It's a great tool to help you establish a solid foundation for your endorsement policies and key distributions. Just a quick reminder: don’t just grab any random TPS numbers. Make sure to tailor them to what you actually need!
  (hyperledger-caliper.github.io).

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Frequently asked build questions (and precise answers)

• Is there any chance that an orderer can access my private medical data in Fabric? Not at all! What actually gets sent through the ordering service are just hashes of the private data. The actual private payloads are kept safe and sound in the PDCs on the authorized peers. (hyperledger-fabric.readthedocs.io).

So, you’re looking to set up time-bound consent in Corda? That’s a great idea! Here’s a simple way to get started:

First off, make sure you have your Corda environment all set up and running smoothly. Once you’ve got that, you’ll be wanting to define the terms of your consent. Think about how long you want that consent to last--it's kind of like setting an expiration date.

Next, you’ll need to create a state that includes both the consent terms and the specific time frame. This usually involves some coding, so if you’re comfortable with Kotlin, you can define a new state that has start and end timestamps.

After that, you’ll want to implement logic in your flow to check whether the current date falls within that consent period before taking any actions that require this consent. It’s like a little gatekeeper for your transactions.

Finally, don’t forget to test everything! Make sure the consent behaves as expected over time. You wouldn’t want any surprises down the road, right?

That should get you on the right track. If you run into any snags, the Corda community is a fantastic resource, so don’t hesitate to reach out for help! Good luck! Make sure to set the validity period for the transaction within the designated time frame. Also, don’t forget to get the notary’s signature while you're at it, all within that same time window! For a bit of variety, it's best to use just one notary service for each type of consent. This way, you can keep things fresh and organized! (docs.r3.com).

So, what do you think about the idea of storing FHIR resources right on the blockchain? Generally speaking, the answer is usually no.
It’s a good idea to stick with references, hashes, and ETags instead. They tend to work out better in the long run! If you're dealing with bigger data transfers, be sure to take a look at the Bulk Data Implementation Guide. It’s a great resource! Oh, and don’t forget to keep a record of any TEFCA or QHIN transactions on-chain. It’s super important! If you’re looking for more info, you can check it out here: projectlifedashboard.hl7.org. Happy exploring!

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A short migration playbook (2025)

• So, if you're rocking Fabric version 2... If you’re currently using version 5 LTS or an earlier version and thinking about making the jump to version 3, you’re in the right place! x:. Hey there! If your governance requires it, definitely give SmartBFT a thought. Just make sure you only enable Ed25519 after you’ve updated the channel capability to V3_0 and taken care of those client updates. Also, it might be worth considering write batching in your chaincode when you're writing to multiple keys in a single transaction. It could make things a lot smoother! (github.com).
• Transitioning from Corda 4 to Corda 5. Hey there! Here’s what you should do:
• Make sure to tweak your setup for REST-startable flows, virtual nodes, and workers. Hey, just a quick reminder to change the notary to the 5. Thanks! Make sure to swap out that non-validating plugin and update your container images to Java 17. For more information, just check out the release notes here. They'll give you all the details you need!

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Bottom line

If you find yourself navigating complex healthcare networks that involve a lot of policies and multiple parties, Fabric is definitely the option you should consider. It really stands out when it comes to shared audits, keeping things private when needed, and managing those heavy-duty key/value tasks, like handling claims, directories, and prior authorizations. If you're looking into situations that really rely on consent, like contracts or research exchanges, then Corda is definitely your best bet. It really shines in situations where privacy matters a lot and one-on-one interactions take precedence over wide-scale broadcasting.

Both of these options really align well with the direction TEFCA is taking with FHIR. If you focus on keeping the payloads in FHIR stores and use the ledger for tracking things like provenance, enforcing policies, and ensuring non-repudiation, you’re in a great spot!

Hey there! If you want a solid, vendor-neutral architecture review that actually delivers results in just four weeks, look no further than 7Block Labs. We’re here to assist you in setting up a Fabric v3, and we’re excited to help you get started! Set up a Corda 5 cluster, make sure it lines up with FHIR/TEFCA standards, and then run some Caliper-backed benchmarks based on your real workflows.

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Sources

• Take a look at the latest updates in Hyperledger Fabric v3! 0-3.

1. This includes cool features like SmartBFT, Ed25519, and write batching, along with some updates on operations. (github.com).

• Stay in the loop with the latest updates on Fabric LTS and any news from the TAC! (lf-decentralized-trust.github.io). Hey, make sure you check out the updates on security and authentication in Fabric CA 1! You won’t want to overlook those changes.

5. 15. (github.com).

• Check out Fabric's ordering system, channels, PDCs, and the glossary for all the details you need to know. (hyperledger-fabric.readthedocs.io). Check out what Corda 5 has to offer! Dive into the workers, explore REST flows, understand how notary uniqueness works, and get familiar with the UTXO ledger. There’s a lot to discover! (docs.r3.com). Hey, take a look at the TEFCA FHIR roadmap (Version 2) and see what's coming up for 2024-2026. There are some cool things in the works! (healthit.gov).
• Dive into HL7 FHIR R5 and check out the Bulk Data IG 2.

0. (hl7.org). Hey, make sure to take a look at the HIPAA de-identification guidance from OCR/HHS. It's really helpful! (hhs.gov). Hey, don’t overlook Hyperledger Cacti and Weaver! They really simplify the whole process of connecting Fabric and Corda, making interoperability a walk in the park. (hyperledger-cacti.github.io). Check out the Change Healthcare case! It really shows off how Fabric manages healthcare transactions on a huge scale. It's pretty impressive! (lfdecentralizedtrust.org).

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