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It's part of switching to merkle trees instead of flat piece lists. A merkle tree can only be verified if you either have a whole layer or send ancestor-sibling
by the8472 9y ago
It's part of switching to merkle trees instead of flat piece lists. A merkle tree can only be verified if you either have a whole layer or send ancestor-siblings (uncle, great-uncle, etc.) along with a partial layer.
Merkle trees allow torrents to start faster from magnet links since only the tree roots need to be front-loaded while the tree can be fetched incrementally.