GA: User-Defined Functions for Azure Confidential Ledger

Effective March 1, 2025, you can keep your records in Azure confidential ledger (ACL) at the reduced price of approximately $3 per day per instance. The reduced price is for the computation and the ledger use. 

To protect your records, automatically create signatures of your blob storage data and keep those in Azure confidential ledger. For forensics, you can verify the tamper protection of the data by verifying against the signature in ACL. Imagine doing this as you are migrating data from one system to another, or when you need to protect data from insider or administrator risks and confidently report that to authorities.  

If you keep your data in Azure SQL database, you can use their security ledger feature to auto generate record digests and store them in ACL for safeguarding.  You can use the SQL stored procedure to verify that no tampering or administrator modifications occurred to your SQL data. 

What is Azure confidential ledger and what is the change?

It is a tamper protected and auditable data store backed by a Merkle tree blockchain structure for sensitive records that require high levels of integrity protection and/or confidentiality. While customers from AI, financial services, healthcare, and supply chain continue to use the ledger for their business transaction’s archival needs and confidential data’s unique identifiers for audit purposes, we are acting on their feedback for scaling ledgers to more of their workloads with a more competitive price! 

How much does Azure confidential ledger cost?

–          Approximately $3/day/ledger

How can I use Azure confidential ledger?

–          Azure SQL database ledger customers can enable confidential ledger as its trusted digest store to uplevel integrity and security protection posture

–          Azure customers who use blob storage have found value in migrating their workloads to Azure with a tamper protection check via the Azure confidential ledger Marketplace App.

–          Azure customers who use data stores and databases (e.g. Kusto, Cosmos, and Log Analytics) may benefit from auditability and traceability of logs being kept in the confidential ledger with new compliance certifications in SOC 2 Type 2 and ISO27001.

News: Azure updates | Microsoft Azure
Blog: Price reduction and upcoming features for Azure confidential ledger! | Microsoft Community Hub
Documentation: Azure confidential ledger documentation | Microsoft Learn


Hi, I’m Oskar!

Cloud architect by day, tech tinkerer by night, and a proud father all the time. Born in 1990 in Poland and now based in Germany, I spend my days diving deep into cloud, Azure, and all things technology. But my passions go beyond the digital world – I love DIY projects, home automation, biking, gardening, and cooking (because good food fuels great ideas).

This little blog is where I share my insights, experiments, and thoughts on cloud tech – because let’s be honest, the internet can always use one more tech enthusiast’s perspective.