An increasingly centralized internet has stifled innovation 

Platform network effects are impossible to compete with 

Solution: a protocol for publishing, discovering, and reusing media metadata

Participants make Statements about a work

Statements

by: Pablo Picasso
title: Bull
year: 1958

-Love, MoMA

can be derived from existing metadata through Translators

Statements

signed with the participant's keypair

Statements

walked to form a complete picture

Chain

title: Horse and Barge,
artist: David Cox

-Tate

title: Horse and Barge,
artist: ???,
year: 1820

-MoMA

anyone can contribute, but untrusted statements discarded at read time

Tree

title: Horse and Barge,
artist: David Cox

-Tate

title: Horse and Barge,
artist: ???,
year: 1820

-MoMA

title: I Like Cheese

-Donald Trump

Data Objects

{
 "type" : "entityUpdate"
 "chain" : { "@link": "QmeP3JJgXunsiVKZ4f...." }
 "entity" : { "@link": "Qmek3AJg4un1iQvZ41...." }
 "signatures" : <Signatures>
 "author" : { "@link": "QmbTcS3DuahG3npWb...." }
 "title" : "Horse and Barge"
  ... ; other metadata updates
}

ArtefactUpdateCell

Chain

Qm000... = Nil

QmCCC... = ArtefactCreationCell {
 "type" : "artefactCreatedBy"
 "chain" : {"@link" : Qm000...}
 "artefact" : {"@link" : QmBBB...}
 "entity" : {"@link" : QmAAA...}
 "signatures" : {...}
 }

QmIII... = ArtefactUpdateCell {
 "type" : "artefactUpdate"
 "chain" : {"@link" : "QmCCC..."}
 "artefact" : {"@link" : "QmBBB..."}
 "title" : "Time May Change Me"
 ...
 }

Journal

ChainEntry {
 "type"  : "update"
 "ref"   : {"@link" : "QmBBB..."}
 "chain" : {"@link" : "QmCCC..."}
 "chainPrevious": {"@link" : "Qm000..."}
 "timestamp" : "..."
 }

ChainEntry {
 "type"  : "update"
 "ref"   : {"@link" : "QmBBB..."}
 "chain" : {"@link" : "QmIII..."}
 "chainPrevious": {"@link" : "QmCCC..."}
 "timestamp" : "..."
 }

Only piece that needs quorum!

Full example at http://tiny.cc/mediachainExample

Network 

Federated design

Raft consensus

Writing

1. Publish statement to IPFS

2. Send chain entry to a transactor

Done!

Reading

Reader nodes receive syndication

build internal representation

(official reader client: mediachain/L-SPACE uses OrientDB)