Synchronous Replication – immudb version 1.4 released

Release notes

We’re pleased to introduce version 1.4 of immudb, which comes with two major features: FIPS-Compliant Builds and Synchronous Replication. And, of course, we’ve fixed bugs and made other improvements.

You can find the new release here for all major platforms:

Regarding SDKs, please make sure to check the compatibility list:

FIPS-Compliant Builds

Starting with v1.4.0, immudb can be compiled using the go-boringcrypto fork of the Go compiler, which uses the FIPS 140-2 compliant boringssl library. We now also officially provide FIPS-compliant binaries and Docker images.

What is it? The FIPS 140-2 standard prescribes the design and security requirements for cryptographic modules that may be approved for use by the United States government. FIPS-140 is a collection of computer security standards set by the National Institute of Standards and Technology (NIST) for the United States government. FIPS 140–2 defines the critical security parameters vendors must use for encryption implementations sold to the U.S government.

Detailed information about FIPS-compliant immudb build can be found in immudb’s source code repository.

Synchronous Replication

Synchronous replication improves the reliability of data replicated across the immudb nodes in a cluster. When an immudb cluster uses synchronous replication, the primary node waits for sufficient transaction confirmations from replicas before it considers the transaction fully committed and durably stored by multiple nodes. This feature increases data durability by allowing any single node in an immudb cluster—including the primary node—to be lost without causing the database state tracked by the nodes and clients to diverge.

Prior to version 1.4, immudb only supports asynchronous replication. When a cluster is configured to use asynchronous replication, replica nodes can lag behind the primary node, and any given transaction committed on the primary node isn’t guaranteed to be replicated to other nodes within a reasonable time period. Thus, transactions committed to a primary node that has not been replicated can be lost if the primary node is irrecoverably lost. When this occurs, the state of the surviving nodes may diverge from the state computed by the immudb client, because the new primary node elected from the remaining replicas could be missing the most recent commits tracked by the clients.

To get more information about synchronous replication please refer to the documentation on

Replication performance

Due to additional synchronization between nodes, commit throughput with synchronous replication will naturally be slower compared to a single-node cluster. The performance difference will depend on various factors such as the speed of disks, network latency, and the number of followers.

In this release we also worked on improvements to the replication mechanism itself, achieving 17 to 20 times larger TX/s replication throughput than what was available in the 1.3.2 release.

SDK Updates

This release also comes with significant updates to immudb SDKs. We’ve brought brand new .Net SDK; added inline documentation to Go SDK; added inline documentation and increased functionality of Python SDK and Java SDK; and made significant updates to the node.js SDK 1.

You can find the full change log and the release download here:

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Use Case - Tamper-resistant Clinical Trials


Blockchain PoCs were unsuccessful due to complexity and lack of developers.

Still the goal of data immutability as well as client verification is a crucial. Furthermore, the system needs to be easy to use and operate (allowing backup, maintenance windows aso.).


immudb is running in different datacenters across the globe. All clinical trial information is stored in immudb either as transactions or the pdf documents as a whole.

Having that single source of truth with versioned, timestamped, and cryptographically verifiable records, enables a whole new way of transparency and trust.

Use Case - Finance


Store the source data, the decision and the rule base for financial support from governments timestamped, verifiable.

A very important functionality is the ability to compare the historic decision (based on the past rulebase) with the rulebase at a different date. Fully cryptographic verifiable Time Travel queries are required to be able to achieve that comparison.


While the source data, rulebase and the documented decision are stored in verifiable Blobs in immudb, the transaction is stored using the relational layer of immudb.

That allows the use of immudb’s time travel capabilities to retrieve verified historic data and recalculate with the most recent rulebase.

Use Case - eCommerce and NFT marketplace


No matter if it’s an eCommerce platform or NFT marketplace, the goals are similar:

  • High amount of transactions (potentially millions a second)
  • Ability to read and write multiple records within one transaction
  • prevent overwrite or updates on transactions
  • comply with regulations (PCI, GDPR, …)


immudb is typically scaled out using Hyperscaler (i. e. AWS, Google Cloud, Microsoft Azure) distributed across the Globe. Auditors are also distributed to track the verification proof over time. Additionally, the shop or marketplace applications store immudb cryptographic state information. That high level of integrity and tamper-evidence while maintaining a very high transaction speed is key for companies to chose immudb.

Use Case - IoT Sensor Data


IoT sensor data received by devices collecting environment data needs to be stored locally in a cryptographically verifiable manner until the data is transferred to a central datacenter. The data integrity needs to be verifiable at any given point in time and while in transit.


immudb runs embedded on the IoT device itself and is consistently audited by external probes. The data transfer to audit is minimal and works even with minimum bandwidth and unreliable connections.

Whenever the IoT devices are connected to a high bandwidth, the data transfer happens to a data center (large immudb deployment) and the source and destination date integrity is fully verified.

Use Case - DevOps Evidence


CI/CD and application build logs need to be stored auditable and tamper-evident.
A very high Performance is required as the system should not slow down any build process.
Scalability is key as billions of artifacts are expected within the next years.
Next to a possibility of integrity validation, data needs to be retrievable by pipeline job id or digital asset checksum.


As part of the CI/CD audit functionality, data is stored within immudb using the Key/Value functionality. Key is either the CI/CD job id (i. e. Jenkins or GitLab) or the checksum of the resulting build or container image.

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