An Interoperability Architecture for Blockchain Gateways
draft-hardjono-blockchain-interop-arch-01

Document Type Active Internet-Draft (individual)
Authors Thomas Hardjono  , Martin Hargreaves  , Ned Smith 
Last updated 2020-10-26
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Internet Engineering Task Force                              T. Hardjono
Internet-Draft                                                       MIT
Intended status: Informational                             M. Hargreaves
Expires: April 30, 2021                                    Quant Network
                                                                N. Smith
                                                                   Intel
                                                        October 27, 2020

        An Interoperability Architecture for Blockchain Gateways
               draft-hardjono-blockchain-interop-arch-01

Abstract

   With the increasing interest in the potential use of blockchain
   systems for virtual assets, there is a need for these assets to have
   mobility across blockchain systems.  An interoperability architecture
   for blockchain systems is needed in order to permit the secure flow
   of virtual assets between blockchain systems, satisfying the
   properties of transfer atomicity, consistency and durability.  The
   architecture must recognize that there are different blockchain
   systems, and that the interior constructs in these blockchains maybe
   incompatible with one another.  Gateway nodes perform the transfer of
   virtual assets between blockchain systems while masking the
   complexity of the interior constructs of the blockchain that they
   represent.

Status of This Memo

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   This Internet-Draft will expire on April 30, 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Assumptions and Principles  . . . . . . . . . . . . . . . . .   5
     3.1.  Design Principles . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Operational Assumptions . . . . . . . . . . . . . . . . .   6
   4.  Architecture  . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Goal of Architecture  . . . . . . . . . . . . . . . . . .   6
     4.2.  Overview of Asset Transfer  . . . . . . . . . . . . . . .   7
     4.3.  Desirable Properties of Asset Transfer  . . . . . . . . .   8
     4.4.  Event log-data, crash recovery and backup gateways  . . .   8
     4.5.  Overview of the Phases in Asset Transfer  . . . . . . . .   9
   5.  Pre-transfer Verification of Asset and Identities (Phase 1) .  10
   6.  Evidence of asset locking or escrow (Phase 2) . . . . . . . .  12
   7.  Transfer Commitment (Phase 3) . . . . . . . . . . . . . . . .  14
   8.  Related Open Issues . . . . . . . . . . . . . . . . . . . . .  16
     8.1.  Global identification of blockchain systems and public-
           keys  . . . . . . . . . . . . . . . . . . . . . . . . . .  16
     8.2.  Selection of gateways nodes within a blockchain system  .  16
     8.3.  Commitment protocols and forms of commitment evidence . .  16
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   10. Policy Considerations . . . . . . . . . . . . . . . . . . . .  17
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  18
     11.2.  Informative References . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

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1.  Introduction
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