Fireblocks updates the API Co-signer software to include stability enhancements and new features. This article provides details about the most recent SGX Co-signer versions. Always use the latest version listed here for optimal performance.
Latest SGX Co-signer image version
Version 2025.08.12 (August 2025; US environments only)
Version hash: 19c07421dc
- Fixed WebSocket bug causing performance issues
SGX Co-signer image version history
Version 2025.07.16 (July 2025)
Version hash: bb61e507
- Fixed bugs and increased performance
- Better support for web sockets
Version 3.10.1 (April 2025)
Version hash: 7160d7b833
- Bug fixes and performance improvements
Version 3.7.1 (October 2024)
Version hash: 4ec196aec5
- Decreased signing latency, along with general performance increases
- Remote management capabilities through Fireblocks Console
- Support for more types of approval requests
- Various fixed and improved handling of internal errors
- Timing details are logged after every outgoing network request
- The cosigner version will be reflected in the HTTP User-Agent header
Version 3.6.5 (February 2024)
Version hash: 3b807e2af7
- Improved logging for easier problem-solving
- Improved stability, security, and performance
- Enhanced deployment flexibility
- Added support for the Callback Handler retry mechanism, enabling the Callback Handler to respond asynchronously
- Updated major and minor dependencies
- Preliminary support for upcoming features
- Bug fixes
Version 3.5.0 (August 2023)
- MPC-CMP security enhancements
- Bug fixes
Version 3.3.0 (January 2022)
- Added support for HTTP network proxy on outbound requests
- Bug fixes
Latest SGX Co-signer script version
Version 1.1.13 (August 2025)
- New default Docker image 2025.08.12
SGX Co-Signer script version history
Version 1.1.11 (April 2025)
- New default Docker image 3.10.1
Version 1.1.10 (January 2025)
- New default Docker image 3.7.1
Version 1.1.9 (February 2024)
- New default Docker image 3.6.5
Version 1.1.8 (January 2024)
- Added support for Callback Handler configuration via Azure Marketplace
- Same default Docker image as in image version 3.5.0 and used as in script version 1.1.7
Version 1.1.7 (August 2023)
- New default Docker image 3.5.0
Version 1.1.6 (February 2023)
- Added support for Docker version 1.29.2
- Added validation for microcode:
- Additional information about the microcode version appears in the logs
- Relevant only to customers with SGX Co-signers installed on-prem
- Added validation to make sure Hyper-Threading is disabled
- If Hyper-Threading is enabled, additional information appears in the logs
- Relevant only to customers with SGX Co-signers installed on-prem
Version 1.1.5 (February 2022)
- New default Docker image 3.3.0
- Added support for Co-signers in high-availability
- Updated authentication model
- Added support for HTTP network proxy on outbound requests
Checking SGX Co-signer versions
How do I check the version of my running SGX Co-signer image?
To check your running SGX Co-signer image version, run the following command on your VM:
docker inspect cosigner | jg -r '.[0].Config.Image +" " + . [0].Image'How do I check the version of my running SGX Co-signer script?
To check your running SGX Co-signer script version, run the following command on your VM:
head cosigner -n 3 | grep -i ver