Research corpusConsensusBLC-STUDY-0159
Zyzzyva: Speculative Byzantine Fault Tolerance
Replicas execute the leader's request speculatively and reply. If every replica agrees, the client is done. A disagreement starts a slower path that looks more like PBFT.
- Official external source only
- Design paper
- Official source
Record
- Authors
- Ramakrishna Kotla, Lorenzo Alvisi, Mike Dahlin, Allen Clement and Edmund Wong
- Date
- 2007
- Publisher
- Ramakrishna Kotla, Lorenzo Alvisi, Mike Dahlin, Allen Clement and Edmund Wong
- Version
- Source cited by the 2007 study. The study is the reading. This page does not add a second essay.
- Document ID
- BLC-STUDY-0159
- DOI
- None recorded
- Last reviewed
- 1 October 2026
- Licence
- No licence recorded. Rights status under review.
No hash is published. This build does not store those PDF bytes, so a checksum would be invented. Where a legacy path exists, it points at the Internet Archive copy of the old library.
Direct answer
Replicas execute the leader's request speculatively and reply. If every replica agrees, the client is done. A disagreement starts a slower path that looks more like PBFT.
Where to read
- Official source — SOSP 2007
- Blockchain Lab study, the canonical readingOriginal commentary. Not a transcription of the paper.
Metadata and commentary only. The reading is the study page.
Full text
Full text is not published on this page. Public availability is not a licence to republish a document. Blockchain Lab has not recorded a licence that permits an HTML transcription, a training set, or a retrieval corpus of the paper. Text on this page is Blockchain Lab's own wording, or a pointer to a study that is also Blockchain Lab's wording.
What changed
A reading of the public document. Not a copy of it, and not a claim about a later network that reused the name.
Relationships
- Canonical readingZyzzyva study
- Related paperPBFT
- Related paperSBFT
Cite this record
These citations point at the source document. They are not a licence to copy it.
Author–date
Kotla, R., Alvisi, L., Dahlin, M., Clement, A., & Wong, E. (2007). Zyzzyva: Speculative Byzantine Fault Tolerance. Ramakrishna Kotla, Lorenzo Alvisi, Mike Dahlin, Allen Clement and Edmund Wong. https://www.cs.utexas.edu/~lorenzo/papers/kotla07zyzzyva.pdf
BibTeX
@techreport{zyzzyva2007,
title = {Zyzzyva: Speculative Byzantine Fault Tolerance},
author = {Ramakrishna Kotla, Lorenzo Alvisi, Mike Dahlin, Allen Clement and Edmund Wong},
year = {2007},
institution = {Ramakrishna Kotla, Lorenzo Alvisi, Mike Dahlin, Allen Clement and Edmund Wong},
url = {https://www.cs.utexas.edu/~lorenzo/papers/kotla07zyzzyva.pdf},
note = {Rights status: Official external source only. Blockchain Lab record: https://blockchainlab.com/research/corpus/papers/zyzzyva}
}RIS
TY - RPRT TI - Zyzzyva: Speculative Byzantine Fault Tolerance AU - Ramakrishna Kotla AU - Lorenzo Alvisi AU - Mike Dahlin AU - Allen Clement AU - Edmund Wong PY - 2007 PB - Ramakrishna Kotla, Lorenzo Alvisi, Mike Dahlin, Allen Clement and Edmund Wong UR - https://www.cs.utexas.edu/~lorenzo/papers/kotla07zyzzyva.pdf N1 - Rights status: Official external source only ER -
CSL-JSON
[
{
"type": "report",
"id": "BLC-STUDY-0159",
"title": "Zyzzyva: Speculative Byzantine Fault Tolerance",
"author": [
{
"literal": "Ramakrishna Kotla"
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{
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{
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{
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"issued": {
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"URL": "https://www.cs.utexas.edu/~lorenzo/papers/kotla07zyzzyva.pdf",
"note": "Rights status: Official external source only. Not a licence to republish the paper."
}
]Rights record
- Source status
- Official source
- Use status
- Metadata and commentary only. The reading is the study page.
- Rights
- Official external source only
- Training and retrieval
- Not permitted from this site. There is no rights-cleared full text to retrieve or to train on.