The Stellar Consensus Protocol (SCP)
draft-mazieres-dinrg-scp-00

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Network Working Group                                           N. Barry
Internet-Draft                            Stellar Development Foundation
Intended status: Experimental                                D. Mazieres
Expires: September 6, 2018                           Stanford University
                                                              J. McCaleb
                                          Stellar Development Foundation
                                                                 S. Polu
                                                             Stripe Inc.
                                                           March 5, 2018

                  The Stellar Consensus Protocol (SCP)
                      draft-mazieres-dinrg-scp-00

Abstract

   SCP is a protocol for Internet-level Byzantine agreement.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on September 6, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  The Model . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Configuration . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Input and output  . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Basic types . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Quorum slices . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Nomination  . . . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  Prepare messages  . . . . . . . . . . . . . . . . . . . .   7
     3.5.  Confirm messages  . . . . . . . . . . . . . . . . . . . .   9
     3.6.  Externalize messages  . . . . . . . . . . . . . . . . . .  10
     3.7.  Message envelopes . . . . . . . . . . . . . . . . . . . .  11
   4.  Security considerations . . . . . . . . . . . . . . . . . . .  12
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   Various aspects of Internet infrastructure depend on irreversible and
   transparent updates to data sets such as authenticated mappings [cite
   Li-Man-Watson draft].  Examples include public key certificates
   mapping domain names to public keys, transparency logs [RFC6962],
   HSTS [RFC6797] and HPKP [RFC7469] preload lists.

   The Stellar Consensus Protocol (SCP) specified in this draft allows
   various Internet infrastructure stakeholders to collaborate in
   applying irreversible transactions to public state.  SCP is an open
   Byzantine agreement protocol that resists Sybil attacks by allowing
   individual parties to specify minimum quorum memberships in terms of
   specific trusted peers.  Hence, participants can choose specific
   peers they know to be trustworthy and enjoy safety so long as the
   peers they depend on honestly obey the protocol.

   An more detailed abstract description of the SCP protocol and
   English-language proof of safety is available in [SCP].  This
   document specifies the end-system logic and wire format of the
   messages.

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