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    Variable DEFAULT_ANCHOR_SOURCESConst

    DEFAULT_ANCHOR_SOURCES: string[] = ...

    Endpoints asked to attest a header's hash at a height (SPEC-VERIFICATION ยง4). Kept separate from DEFAULT_ESPLORA on purpose: attesting needs one cheap endpoint (/block-height/<n>), while serving proofs needs the full esplora surface, so membership is a different question. bitcoin.lu.ke for instance 404s on /tx/<txid>/merkle-proof and answers hash-at-height fine.

    Backends that served the bundle are filtered out of this list before the vote, so an operator appearing in both lists still cannot vote for its own header. Each entry was checked against 767430 for three consecutive tries on 2026-07-26.