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feat: add RPC API - #53
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Oct 30, 2026
…peers (lambdaclass#53) A range batch sends its blocks and a DataColumnsByRange for the same span together, and the column request is aimed by custody, which is only known once a peer's metadata/3 answer or ENR cgc has been read. Right after startup that is almost nobody. On a mainnet follower after a fresh checkpoint sync, the first batch went out 5 s after startup with two peers and at most one known custodian per column, and 121 of the 122 holds it caused were missing every custody column; a short or empty range answer is never retried, so each block was left to the by-root path. A batch whose span reaches fulu is now held, blocks included, until every custody column has a known custodian among the connected peers, the way lighthouse's range sync holds its batches. It is re-checked after every metadata answer, on every Status answer, and at a deadline, past which it goes anyway with the old fallback: nothing here searches for a custodian of a specific column, so an open-ended wait could stall sync.
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