Protocol Labs Research
About
People
Research
Outreach
Blog

Yiannis Psaras

Research Scientist / ResNetLab

Education

PhD in Computer Networks, 2008

Democritus University of Thrace

Yiannis has a long-standing interest in Information- or Content-Centric Networks with several noteworthy contributions in the area. He has extensive background in several of the architectural and protocol design aspects of Information-Centric Networks having run several projects over the last decade. He sees IPFS as a deployment of ICN in the wild with a huge user-base and is therefore excited to contribute his past experience into the protocol design choices of a live network. Yiannis is active in the ICN research community and the IRTF ICNRG. In the past, he has worked in areas related to congestion control, routing, caching, naming and resource allocation of current and future fixed and mobile Internet architectures. He believes that decentralisation of Internet services will be demanded through the need to deploy services at the edge of the network, aka edge-computing. A brief thesis on this together with related works can be found here: https://www.ee.ucl.ac.uk/~ipsaras/ddec.html

Areas of Expertise

Networking

Publications

2021-06-21 / Conference paper
The case for AI based Web3 reputation systems
Initiatives such as blockchains and decentralized storage networks are pushing for a decentralized Web3 to replace the current architecture. At the core of Web3 are network resource sharing services, which allow anyone to sell spare network capacity in return for rewards.
DI2F / 2021.06.21 / Espoo, Finland
Navin V. Keizer, Fan Yang, Yiannis Psaras , George Pavlou
2021-06-11 / Conference paper
IPFS-FAN: A Function-Addressable Computation Network
Permissionless computation is one of the missing pieces in the web3 stack in order to have all the tools needed to “decentralise Internet services”. There are already proposals to embed computation in decentralised networks like smart contracts, or blockchain networks for computational offloading.
DI2F / 2021.06.21 / Espoo, Finland
2021-01-14 / Report
Accelerating content routing with Bitswap: A multi-path file transfer protocol in IPFS and Filecoin
Bitswap is a Block Exchange protocol designed for P2P Content Addressable Networks. It leverages merkle-linked graphs in order to parallelize retrieval and verify content integrity. Bitswap is being used in the InterPlanetary File System architecture as the main content exchange protocol, as well as in the Filecoin network as part of the block synchronisation protocol.
2020-12-07 / Conference paper
PASTRAMI: Privacy-preserving, auditable, scalable & trustworthy auctions for multiple items
Decentralised cloud computing platforms enable individuals to offer and rent resources in a peer-to-peer fashion. They must assign resources from multiple sellers to multiple buyers and derive prices that match the interests and capacities of both parties.
Middleware '20 / 2020.12.07
Michał Król, Alberto Sonnino, Argyrios Tasiopoulos, Yiannis Psaras , Etienne Rivière
2020-10-11 / Conference paper
Rewarding relays for decentralised NAT traversal using smart contracts
Traversing NAT’s remains a big issue in P2P networks, and many of the previously proposed solutions are incompatible with truly decentralised emerging applications. Such applications need a decentralised NAT traversal solution without trusted centralised servers.
Mobihoc '20 / 2020.10.11
Navin V. Keizer, Onur Ascigil, Yiannis Psaras , George Pavlou
2020-07-06 / Report
GossipSub: Attack-resilient message propagation in the Filecoin and ETH2.0 networks
Permissionless blockchain environments necessitate the use of a fast and attack-resilient message propagation protocol for Block and Transaction messages to keep nodes synchronised and avoid forks. We present GossipSub, a gossip-based pubsub protocol, which, in contrast to past pubsub protocols, incorporates resilience against a wide spectrum of attacks.
Dimitris Vyzovitis, Yusef Napora, Dirk McCormick, David Dias , Yiannis Psaras
2020-04-27 /
Merkle-CRDTs: Merkle-DAGs meet CRDTs
We study Merkle-DAGs as a transport and persistence layer for Conflict-Free Replicated Data Types (CRDTs), coining the term Merkle-CRDTs and providing an overview of the different concepts, properties, advantages and limitations involved.
Hector Sanjuan, Samuli Poyhtari, Pedro Teixeira, Yiannis Psaras
2020-04-18 / Report
Gossipsub-v1.1 evaluation report
Permissionless blockchain environments necessitate the use of a fast and attack-resilient message propagation protocol for Block and Transaction messages to keep nodes synchronised and avoid forks. We present GossipSub, a gossip-based pubsub protocol, which, in contrast to past pubsub protocols, incorporates resilience against a wide spectrum of attacks.
Dimitris Vyzovitis, Yusef Napora, Dirk McCormick, David Dias , Yiannis Psaras

Blog posts

2021-07-21 / News, Events
Decentralising the Internet with IPFS and Filecoin (DI2F) — a report from the trenches
The first edition of the DI2F Workshop, which took place on 21 June 2021 and focused on decentralising the Internet with IPFS and Filecoin, has been a phenomenal success! We received more than 20 submissions, out of which 11 were selected to be presented on the day (scroll down to the three sections at the bottom of this page for the full text).
2021-06-08
ResNetLab on Tour in Australia
On May 5th, ResNetLab participated in a flagship event involving four major Australian universities — Royal Melbourne Institute of Technology (RMIT), University of New South Wales, Australian National University and Macquarie University — and lots of Web 3.
2021-06-02 / Blog
ResNetLab presentations at Devfolio's ETH India 2021 Fellowship
Hot off the heels of ETHDenver, the largest Ethereum community event in North America, the Devfolio team who ran the hackathon platform for the event asked if we’d be interested in doing an IPFS training for another of their programs: the Devfolio Ethereum India Fellowship.
2021-05-24 / News
Call for Participation: DI2F: Decentralizing the Internet with IPFS and Filecoin
The first edition of a research-focused workshop on decentralisation, IPFS, and Filecoin is here! DI2F is taking place alongside IFIP Networking 2021 on 21 June 2021 and has a packed programme full of interesting paper presentations, demos, abstracts, hands-on tutorials and invited talks!
2021-05-13 / News
ResNetLab on Tour: [email protected]
We were delighted to present our brand new ResNetLab on Tour programme to the vibrant community of the Berkeley’s Blockchain Innovation Hub on April 28th and 29th! The ResNetLab on Tour programme is a one-stop-shop for all things IPFS and Web 3.
2021-04-06 / News
ResNetLab on Tour tutorials go on-demand
We started the ResNetLab on Tour programme in late 2019 with the goal of onboarding the research and academic community to the IPFS architecture and the interesting open problems and research directions associated with the decentralisation of internet services.
2021-03-16 / Talks
Protocol Labs at FOSDEM 2021
FOSDEM is one of the biggest events for software developers building open-source software. Founded in 2000, the conference takes place once a year in Brussels, gathering over 8000 developers, hackers, and engineers from across the spectrum of software development.
2021-02-11 / Talks
IEEE GLOBECOM 2020 - The InterPlanetary File System and the Filecoin Network
IEEE Globecom is one of the flagship IEEE ComSoc conferences in the field of networks and communications – and, with over 2000 attendees, one of the largest conferences in the field.
2021-02-03 / Event
Decentralising the Internet with IPFS and Filecoin (DI2F) workshop at IFIP Networking 2021: Call for Contributions
Since the InterPlanetary File System (IPFS) was first introduced in a 2014 whitepaper, interest from the research community on improving and building on its protocol stack has been steadily growing. A search for “IPFS networking” on Google Scholar now returns over 1500 results, and that is just a fraction of the relevant publications.
2021-01-20 / Blog
ResNetLab 2020 in review: we love it when a plan comes together
We hope you spent some fantastic time with your loved ones during the holiday season. With the time to pause, rest, and reflect – and with the goal of kicking off 2021 in the best way possible – we decided to capture ResNetLab’s 2020 highlights, share what we’ve learned, and describe what we will be focusing on in 2021.
2021-01-11 / Blog
Beyond Swapping Bits: project review (and preview!)
If you have been following along for the past three months (1, 2, 3, 4), you know that we in ResNetLab started the Beyond Bitswap project with one goal in mind: to drive speed-ups for file-sharing in IPFS.
2021-01-01 / Blog
Our Bitswap nodes have become “jumping inspectors” (updated)
A few weeks ago, we shared how we have taught our Bitswap nodes to jump. If you recall from that post, the content discovery range extension gained came at the expense of an increased number of duplicate blocks exchanged in the network.
2020-12-10 / Blog
Teaching Bitswap nodes to jump
By now you may have heard about ResNetLab’s research endeavour to drive speed-ups on file transfers: Beyond Swapping Bits. Our recent blog post, “Honey, I shrunk our libp2p streams”, considers how adding compression to libp2p could lead to significant bandwidth savings.
2020-11-25 / Talks
IEEE/IFIP CNSM 2020 - The InterPlanetary File System and the Filecoin Network
ResNetLab was invited to present a 3.5 hour tutorial at one of the biggest conferences in the “NetMan” community, the 16th International Conference on Network and Service Management. We were impressed by the quality of talks, keynotes, workshops, and tutorials presented during the conference.
2020-11-03 / Blog
"Two ears, one mouth": how to leverage bitswap chatter for faster transfers
As part of ResNetLab’s research endeavour to drive speed-ups on file transfers, Beyond Swapping Bits, we present a new contribution to IPFS Bitswap protocol. We argue that Bitswap is currently discarding a wealth of information that could be used to its benefit, improving retrieval success and minimizing the latency to retrieve content.
2020-10-29 / Blog
Honey, I shrunk our libp2p streams
Today we’re excited to share the story of how we decided to explore compression for libp2p streams and ended up achieving up to a 75% decrease in bandwidth use when performing an IPFS file exchange.
2020-10-06 / Blog
GossipSub: An attack-resilient messaging-layer protocol for public blockchains
Securing permissionless networks is the bane of open networks, starting with the Internet and every overlay network that operates over it. This challenge has existed from the early days of the Internet to the current Web 3.
2020-07-23 / Blog
How content addressing can solve streaming challenges as networks are overloaded
Given the mass migration to remote work we’ve seen in recent months, you’d think the internet would be collapsing under the added strain. Yet precisely the opposite has happened. As experts have observed, the internet isn’t buckling under added traffic; it’s thriving.
2020-07-01 / Talks
IEEE/IFIP DSN 2020 - The InterPlanetary File System and the Filecoin Network
ResNetLab was invited to present “The InterPlanetary File System and the Filecoin Network” in a 3-hour tutorial at the IEEE/IFIP International Conference on Dependable Systems and Networks! The conference, now in its 50th edition, has an established track record of top-quality research contributions, and is one of the oldest conferences in its subject area.
2020-06-08 / Talks
IPFS talk at the IRTF Decentralised Internet Infrastructure Research Group meeting
ResNetLab was invited to meet with the Decentralised Internet Infrastructure Research Group (DINRG) of the Internet Research Task Force (IRTF) to present and discuss the Software Architecture of the IPFS protocol.
2020-05-18 / Talks
NDN Seminar: a high-level overview of the InterPlanetary File System
ResNetLab was invited to present the “High-Level Overview of the IPFS Architecture” to the Named Data Networking consortium!
2020-05-07 / Talks
Next Generation Networks (NGN) group talk: A high-level overview of the InterPlanetary File System
The Next Generation Networks (NGN) group recently invited the Resilient Networks Lab (ResNetLab) to present a tutorial on IPFS. NGN is a vibrant group of academics, industry researchers and engineers working in the general area of — you guessed it — next-generation networks.
2020-05-03 / Talks
IEEE ICBC 2020: The InterPlanetary File System and the Filecoin Network
ResNetLab presented at one of the most prominent conferences in the area of Distributed Ledger Technologies: the IEEE International Conference on Blockchain and Cryptocurrencies! IEEE ICBC 2020 took place remotely, was well-attended, and had an exciting programme both in terms of tutorials during the first day and invited talks during the main conference, where Vitalik Buterin delivered the keynote speech.
2019-12-30 / News
A new lab for resilient networks research
Resiliency is at the core of systems that are capable of standing the test of time, providing unshakable access for the many generations to come. A resilient system or network is fundamentally uncompromised by an isolated failure or network split.