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.
Latest version
Version 2025.08.12 (August 2025; US environments only)
Version hash: 19c07421dc
- Fixed WebSocket bug causing performance issues
Version history
Version 2025.07.16 (July 2025)
Version hash: bb61e507
- Fixed bugs and increased performance
- Better support for web sockets
Version 2.1.1 (April 2025)
Version hash: 7160d7b833
- Bug fixes and performance improvements
Version 2.0.5 (September 2024)
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)
Version hash: 41d1888dc8
- Fixed the issue when setting AWS region using environment variables
- Removed unnecessary testing artifacts
Version 2.0.2 (August 2024)
- 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)
- 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)
- Initial release