An N block reorg on Bitcoin with more proof-of-work appears out of nowhere with a double spend. How big does N have to be before you choose not to accept the reorg?
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Replying to @neha
It really depends why. Was your node offline, partitioned or new/eclipse attacked. To know you need redundant independent networking (satellite, 3G, wired, SMS headers,+????) If it was definitely not partitioned then maybe you want human warning and fail closed at 20 deep already
3 replies 0 retweets 16 likes -
Also weak blocks could help in having faster recognitiom of a sudden disconnect from the non-partitioned majority hashrate. Variance is so high at 10mins that you can't distinguish bad luck from partitioned or selective malicious network filtering.
1 reply 0 retweets 8 likes
It’s true that maintaining redundant & independent networking stacks help in detecting partitions, but does “human warning and fail closed at 20 deep” help when there is a malicious majority hashrate? That just postpones the decision right? 
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