Fireblocks updates the API Co-signer software to include stability enhancements and new features. This article details the most recent AWS Nitro Co-signer versions. Always use the latest version listed here for optimal performance.
AWS Nitro Co-signer image version history
Version 2025.07.16 (July 2025) - General Availability
Version hash: bb61e507
- Fixed bugs and increased performance
- Better support for web sockets
Version 2.1.1 (April 2025) - General Availability
Version hash: 7160d7b833
- Bug fixes and performance improvements
Version 2.0.5 (September 2024) - General Availability
Version hash: d177e696c3
- Decreased signing latency along with general performance increases
- Extended filtering of environment variables
- Improvements to key handling within the enclave
- Bug fixes
Version 2.0.4 (August 2024) - Early Availability
Version hash: 41d1888dc8
- Fixed issue when setting AWS region using environment variables
- Removed unnecessary testing artifacts
Version 2.0.3 - Skipped (no release, no tag)
Version 2.0.2 (August 2024) - Early Availability
- Modified KMS CMK ARN prompt
- Added start, stop and restart commands
- Added echo to show where logs are saved to
- Fixed AWS NTP sync issue
- Fixed Callback Handler public key issue on install
- Removed unnecessary testing artifacts
Version 2.0.1 (July 2024) - Early Availability
- Added check for force flag and existence of destination before the user is prompted for details
- Added route DNS queries to the DNS server defined on the host EC2 instance
Version 2.0.0 (June 2024) - Early Availability
- Initial release