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Let's suppose I run a legacy (non-SegWit) node after SegWit gets activated. My blockchain doesn't store any SegWit data. What happens when I upgrade my node? Will I have to re-download the blockchain to include the missing SegWit data?

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Indeed.

Bitcoin Core will, after upgrade to a SegWit-compatible version (0.13.1 and later), rewind to the latest non-SegWit block and then fetch the later blocks again.

  • Will it fetch only the witness data or the entire block? – sanket1729 Aug 30 '17 at 3:03
  • The entire block. There is no P2P protocol for downloading just witnesses. – Pieter Wuille Aug 30 '17 at 3:17

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