consensus: Reimplement checkpoint-based spam protection #2084
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This ensures that the chainparams interface will never fail when fetching the first or last checkpoint from the map.
This removes the Checkpoints::GetTotalBlocksEstimate() function in favor of CCheckpointData::GetHeight() to match Bitcoin and prepare for a codebase upgrade. The new function should run a bit faster.
Commit c949a02 removed broadcasted checkpoints and reimplemented Checkpoints::CheckSync() for hardened checkpoints. However, the change did not apply the validation again for received blocks. This reimplements the validation using a similar strategy for nodes that finished the initial sync. With this change, nodes will refuse blocks that connect to a height below the highest checkpoint.
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Unfortunately, this isn't really effective for the orphan block problem. It takes too long for forked nodes to reach a state where they advertise a block that triggers the rule (hours, if ever). Besides that, the changes appear to behave as expected on my listening node and don't interfere with normal operation. |
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So do we just want to close this then? |
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The validation rule is still a useful mitigation for some types of spam. |
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Added - doc: Invite users to donate to Gridcoin Foundation gridcoin-community#1997 (@smoe) - rpc: Add "getburnreport" RPC function gridcoin-community#2049 (@cyrossignol) - doc: Add undocumented "-showorphans" GUI option to help text gridcoin-community#2058 (@cyrossignol) - beacon: Cull beacon db memory (passivation) gridcoin-community#2069 (@jamescowens) - gui: Avoid refreshing GUI researcher status while out-of-sync gridcoin-community#2068 (@cyrossignol) - consensus: Reimplement checkpoint-based spam protection gridcoin-community#2084 (@cyrossignol) - consensus: Verify hardened checkpoints on start up gridcoin-community#2087 (@cyrossignol) Changed - gui: Clarify overview page "stake" field gridcoin-community#2056 (@cyrossignol) - doc: Update Copyright headers gridcoin-community#2059 (@barton2526) - gui: Update Qt Linguist localization files gridcoin-community#2063 (@cyrossignol) - build: update dependencies gridcoin-community#2064 (@barton2526) - net: Reduce default connection limit back to 125 gridcoin-community#2066 (@cyrossignol) - build: openssl patch gridcoin-community#2074 (@barton2526) - translation: Translate /src/qt/locale/bitcoin_en.ts in pt_PT gridcoin-community#2083 (@DjMVeiga) - log: Adjust logging gridcoin-community#2076 (@jamescowens) - gui: Change scraper tab to Inconsolata monospace font gridcoin-community#2085 (@jamescowens) - researcher: Change beacon deferment fix to reference nActiveBeforeSB gridcoin-community#2092 (@jamescowens) Removed - net: Clean up mandatory protocol version transition gridcoin-community#2080 (@cyrossignol) - refactor: Remove LessVerbose() function gridcoin-community#2089 (@cyrossignol) Fixed - beacon: Fix a subtle error in renewal chain walker gridcoin-community#2054 (@jamescowens) - researcher: Fix "malformed CPID" status for some pool projects gridcoin-community#2052 (@cyrossignol) - lint: Misc Typos gridcoin-community#2060 (@barton2526) - lint: remove identified duplicate includes gridcoin-community#2061 (@barton2526) - gui: Fix splash screen block height progress gridcoin-community#2057 (@cyrossignol) - gui: Fix garbage placeholders in some tx notification localizations gridcoin-community#2070 (@cyrossignol) - build: Patch libzip to fix mingw compile regression for mingw 9.2+ gridcoin-community#2082 (@jamescowens) - gui: Fix shutdown response for failed core init gridcoin-community#2088 (@cyrossignol) - researcher: Fix deferment of beacon renewal in superblock window gridcoin-community#2090 (@cyrossignol) - gui: Fix typo in beacon status refresh gridcoin-community#2091 (@div72)
jamescowens
added a commit
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Apr 4, 2021
Added - doc: Invite users to donate to Gridcoin Foundation gridcoin-community#1997 (@smoe) - rpc: Add "getburnreport" RPC function gridcoin-community#2049 (@cyrossignol) - gui: Add stats export reminder to beacon wizard auth page gridcoin-community#2050 (@cyrossignol) - doc: Add undocumented "-showorphans" GUI option to help text gridcoin-community#2058 (@cyrossignol) - beacon: Cull beacon db memory (passivation) gridcoin-community#2069 (@jamescowens) - gui: Avoid refreshing GUI researcher status while out-of-sync gridcoin-community#2068 (@cyrossignol) - consensus: Reimplement checkpoint-based spam protection gridcoin-community#2084 (@cyrossignol) - consensus: Verify hardened checkpoints on start up gridcoin-community#2087 (@cyrossignol) Changed - test: autogenerate data headers gridcoin-community#2030 (@div72) - doc: Change copyright years to 2021 gridcoin-community#2042 (@caraka) - gui: Clarify overview page "stake" field gridcoin-community#2056 (@cyrossignol) - doc: Update Copyright headers gridcoin-community#2059 (@barton2526) - gui: Update Qt Linguist localization files gridcoin-community#2063 (@cyrossignol) - build: update dependencies gridcoin-community#2064 (@barton2526) - net: Reduce default connection limit back to 125 gridcoin-community#2066 (@cyrossignol) - build: openssl patch gridcoin-community#2074 (@barton2526) - translation: Translate /src/qt/locale/bitcoin_en.ts in pt_PT gridcoin-community#2083 (@DjMVeiga) - log: Adjust logging gridcoin-community#2076 (@jamescowens) - gui: Change scraper tab to Inconsolata monospace font gridcoin-community#2085 (@jamescowens) - researcher: Change beacon deferment fix to reference nActiveBeforeSB gridcoin-community#2092 (@jamescowens) Removed - net: Clean up mandatory protocol version transition gridcoin-community#2080 (@cyrossignol) - refactor: Remove LessVerbose() function gridcoin-community#2089 (@cyrossignol) Fixed - build: Fix depends cross-compilation for macOS gridcoin-community#2038 (@cyrossignol) - build: Deal with Qt depends .qmake.stash file gridcoin-community#2048 (@cyrossignol) - beacon: Fix a subtle error in renewal chain walker gridcoin-community#2054 (@jamescowens) - researcher: Fix "malformed CPID" status for some pool projects gridcoin-community#2052 (@cyrossignol) - lint: Misc Typos gridcoin-community#2060 (@barton2526) - lint: remove identified duplicate includes gridcoin-community#2061 (@barton2526) - gui: Fix splash screen block height progress gridcoin-community#2057 (@cyrossignol) - gui: Fix garbage placeholders in some tx notification localizations gridcoin-community#2070 (@cyrossignol) - build: Patch libzip to fix mingw compile regression for mingw 9.2+ gridcoin-community#2082 (@jamescowens) - gui: Fix shutdown response for failed core init gridcoin-community#2088 (@cyrossignol) - researcher: Fix deferment of beacon renewal in superblock window gridcoin-community#2090 (@cyrossignol) - gui: Fix typo in beacon status refresh gridcoin-community#2091 (@div72)
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Commit c949a02 removed Peercoin's broadcasted, dynamic checkpoints system and reimplemented
Checkpoints::CheckSync()for hardened checkpoints. However, the change did not reapply the validation again for received blocks.This reimplements the validation using a similar strategy for nodes that finished the initial sync. With this change, nodes will refuse blocks that connect at a height below the highest checkpoint. This provides an earlier, cheaper spam mitigation for forked chains that will never validate against the set of hardened checkpoints.
I added a new checkpoint for block 2200000 (2021-03-18) so that this rule applies to nodes that forked because of the earlier newbie bug. It should eventually help to soften some of the orphan noise indirectly without the need for a more intrusive stale block handling routine at this time.