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49. Bitcoin Finality and Reorg Resistance

Bitcoin-backed transaction security.

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Under the Stacks Nakamoto consensus, once a Stacks block settles onto the Bitcoin blockchain, reversing a Stacks transaction requires reorganizing the Bitcoin blockchain itself.

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Check your understanding

1. What guarantees the finality of Stacks transactions after the Nakamoto upgrade?
Bitcoin chain finality and proof-of-work securityA standalone validator committeeProof of AuthorityLocal node consensus
2. How difficult is it to reorg settled Stacks transactions?
As difficult as reorganizing the Bitcoin base chainEasyCan be done with 10% Stacks hash rateOnly requires STX tokens

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