I'm trying Nodeos, but full-syncing takes too much time. Is there a way to light-sync Nodeos? Such as "syncmode=light" of Geth? Thanks in advance.

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Yes, you can run nodeos with --validation-mode=light. nodeos --help should provide information about the flags:

In plugins/chain_plugin/chain_plugin.cpp:

Chain validation mode ("full" or "light")

  • In "full" mode all incoming blocks will be fully validated

  • In "light" mode all incoming blocks headers will be fully validated; transactions in those validated blocks will be trusted

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