SIMD-0337 Markers for Alpenglow Fast Leader Handover
We propose augmenting BlockMarkerV1, introduced in SIMD-0307, to include BlockHeader and UpdateParent variants. BlockHeader, placed at the beginning of a block, indicates the parent of the block. UpdateParent signals that the intended parent is different from what was initially indicated, paving the way for Fast Leader Handover support in Alpenglow (section 2.7 of https://www.anza.xyz/alpenglow-1-1).
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