The Stellar Consensus Protocol (SCP)

Document Type Expired Internet-Draft (individual)
Authors Nicolas Barry  , Giuliano Losa  , David Mazieres  , Jed McCaleb  , Stanislas Polu 
Last updated 2019-05-08 (latest revision 2018-11-04)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


SCP is an open Byzantine agreement protocol resistant to Sybil attacks. It allows Internet infrastructure stakeholders to reach agreement on a series of values without unanimous agreement on what constitutes the set of important stakeholders. A big differentiator from other Byzantine agreement protocols is that, in SCP, nodes determine the composition of quorums in a decentralized way: each node selects sets of nodes it considers large or important enough to speak for the whole network, and a quorum must contain such a set for each of its members.


Nicolas Barry (
Giuliano Losa (
David Mazieres (
Jed McCaleb (
Stanislas Polu (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)