HALO: High-Availability Submission and Traffic Control for Multi-Hosted Applications - #745
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Development Fund Proposal Submission
Proposal file:
/proposals/2026-08-K2FLabs-halo-failover-load-balancer.md
Applicant
Organization:
K2F Labs
Author / Primary Contact:
Kevin Ko, kko@k2flabs.com
Champion:
Needs Champion
Proposal Classification
Proposal Type:
RFP / Roadmap Area:
RFP 4, Application-level resilience and party-level Highly Available failover (Protocol, Infrastructure, Scalability & Resilience). Secondary RFP 23, Validator and Shared Infrastructure Security and Resilience.
Label:
party-portability-data-resilience
Funding & Timeline
Total Funding Request:
2,850,000 CC (engineering 1,850,000 CC, adoption up to 1,000,000 CC)
Project Duration:
7 months engineering, adoption window 12 months from Milestone 3 acceptance
Maximum Amount:
N/A
Maximum Duration:
N/A
Summary
Co-validation lets a party be hosted on several validators, but an application still submits through one participant, and Canton's documentation states that an application cannot transparently fail over between participants because deduplication state is not shared. HALO is an open-source sidecar (Rust, Apache-2.0) that presents the unchanged Ledger API, routes each submission to a healthy host of the party, fails over to another host after a host is lost without duplicating a transaction, and adds traffic priority lanes, optional consumption-driven top-up and per-host observability. It makes co-validation cover submission as well as confirmation, for every application in every language, with no changes to Canton, Splice or any SDK.
Submission Checklist
Needs Championselected