feat: add Cloudflare R2 as primary CRS host with S3 fallback #20081
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Adds a new Cloudflare R2 endpoint (crs.aztec-cdn.foundation) as the primary CRS download source with automatic fallback to the existing AWS S3 bucket (crs.aztec.network) on failure. This improves reliability and reduces costs since R2 has no egress fees. Changes: - C++: Added fallback logic in get_bn254_crs.cpp with HTTPS support - TypeScript: Added fetchWithFallback helper in net_crs.ts - Shell: Added download_with_fallback function in bootstrap.sh and download_bb_crs.sh - Tests: Added fallback tests for both C++ and TypeScript Resolves AztecProtocol/barretenberg#1609
charlielye
reviewed
Jan 31, 2026
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| // Use a bad primary URL that will fail, forcing fallback to the real S3 URL | ||
| std::string bad_primary = "http://nonexistent.invalid/g1.dat"; | ||
| std::string good_fallback = "http://crs.aztec.network/g1.dat"; |
Contributor
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you should now be able to change these labs fallback domains to crs.aztec-labs.com
Contributor
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Where's the terraform for this cloudflare bucket? It should be committed to iac-foundation repo. |
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Summary
crs.aztec-cdn.foundation) as primary CRS download sourcecrs.aztec.network) on failureChanges
get_bn254_crs.cppwith HTTPS support for R2fetchWithFallbackhelper innet_crs.tsdownload_with_fallbackfunction inbootstrap.shanddownload_bb_crs.shCrsFactory.Bn254Fallback) and TypeScriptTest plan
srs_testspass (including newBn254Fallbacktest)net_crs.test.tspasses (tests primary download and fallback)Resolves AztecProtocol/barretenberg#1609