{"type":"rich","version":"1.0","author_name":"Braydon Fuller [ARCHIVE] (npub1fx…xxtaa)","author_url":"https://nostr.ae/npub1fx2eyw7avet7dut0slazcehwvrrlhjp2u9jc9zd92l7nexpxeahs4xxtaa","provider_name":"njump","provider_url":"https://nostr.ae","html":"📅 Original date posted:2019-10-03\n📝 Original message:Hi everyone,\n\nWe would like to share a paper for broad discussion, it is titled\n\"Bitcoin Chain Width Expansion Denial-of-Service Attacks\".\n\n\u003eFrom the abstract: The attacks leverage unprotected resources for a\ndenial-of-service by filling the disk and exhausting the CPU with\nunnecessary header and block data. This forces the node to halt\noperation. The attack difficulty ranges from difficult to easy. There\nare currently limited guards for some of the attacks that require\ncheckpoints to be enabled. This paper describes a solution that does not\nrequire enabling or maintaining checkpoints and provides improved security.\n\nAs the checkpoints in Bitcoin Core have not been maintained or updated\nsince mid 2014, this is especially relevant. Bitcoin Core implements\nheaders-first synchronization, since 2014, that provides the base for\nthe further improvements upon that design.\n\nThe paper is available at:\nhttps://bcoin.io/papers/bitcoin-chain-expansion.pdf\n\nThe proposed solution has been implemented in Bcoin and is available at:\nhttps://github.com/bcoin-org/bcoin/tree/chain-expansion\n\nBest,\nBraydon Fuller"}