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+ETH 2.0 Networking Spec - Libp2p standard protocols
+===
+
+# Abstract
+
+Ethereum 2.0 clients plan to use the libp2p protocol networking stack for
+mainnet release. This document aims to standardize the libp2p client protocols,
+configuration and messaging formats.
+
+# Libp2p Components 
+
+## Transport
+
+This section details the libp2p transport layer that underlies the
+[protocols](#protocols) that are listed in this document.
+
+Libp2p allows composition of multiple transports. Eth2.0 clients should support
+TCP/IP and optionally websockets. Websockets are useful for implementations
+running in the browser and therefore native clients would ideally support these implementations 
+by supporting websockets.
+
+An ideal libp2p transport would therefore support both TCP/IP and websockets.
+
+*Note: There is active development in libp2p to facilitate the
+[QUIC](https://github.com/libp2p/go-libp2p-quic-transport) transport, which may
+be adopted in the future*
+
+### Encryption
+
+Libp2p currently offers [Secio](https://github.com/libp2p/specs/pull/106) which
+can upgrade a transport which will then encrypt all future communication. Secio
+generates a symmetric ephemeral key which peers use to encrypt their
+communication. It can support a range of ciphers and currently supports key
+derivation for elliptic curve-based public keys.
+
+Current defaults are:
+- Key agreement: `ECDH-P256` (also supports `ECDH-P384`)
+- Cipher: `AES-128` (also supports `AES-256`, `TwofishCTR`)
+- Digests: `SHA256` (also supports `SHA512`)
+
+*Note: Secio is being deprecated in favour of [TLS
+1.3](https://github.com/libp2p/specs/blob/master/tls/tls.md). It is our
+intention to transition to use TLS 1.3 for encryption between nodes, rather
+than Secio.*
+
+
+## Protocols
+
+This section lists the necessary libp2p protocols required by Ethereum 2.0
+running a libp2p network stack.
+
+## Multistream-select
+
+#### Protocol id: `/multistream/1.0.0`
+
+Clients running libp2p should support the
+[multistream-select](https://github.com/multiformats/multistream-select/)
+protocol which allows clients to negotiate libp2p protocols establish streams
+per protocol.
+
+## Multiplexing
+
+Libp2p allows clients to compose multiple multiplexing methods. Clients should
+support [mplex](https://github.com/libp2p/specs/tree/master/mplex) and
+optionally [yamux](https://github.com/hashicorp/yamux/blob/master/spec.md)
+(these can be composed).
+
+**Mplex protocol id: `/mplex/6.7.0`**
+
+**Yamux protocol id: `/yamux/1.0.0`**
+
+## Gossipsub
+
+#### Protocol id: `/eth/serenity/gossipsub/1.0.0`
+
+*Note: Parameters listed here are subject to a large-scale network feasibility
+study*
+
+The [Gossipsub](https://github.com/libp2p/specs/tree/master/pubsub/gossipsub)
+protocol is used for block and attestation propagation across the
+network.
+
+### Configuration Parameters
+
+Gossipsub has a number of internal configuration parameters which directly
+effect the network performance.  Clients can implement independently, however
+we aim to standardize these across clients to optimize the gossip network for
+propagation times and message duplication. Current network-related defaults are:
+
+```
+(
+	// The target number of peers in the overlay mesh network (D in the libp2p specs).
+	mesh_size: 6
+	// The minimum number of peers in the mesh network before adding more (D_lo in the libp2p specs).
+	mesh_lo: 4
+	// The maximum number of peers in the mesh network before removing some (D_high in the libp2p sepcs).
+	mesh_high: 12
+	// The number of peers to gossip to during a heartbeat (D_lazy in the libp2p sepcs).
+	gossip_lazy: 6 // defaults to `mesh_size`
+	// Time to live for fanout peers (seconds).
+	fanout_ttl: 60
+	// The number of heartbeats to gossip about.
+	gossip_history: 3
+	// Time between each heartbeat (seconds).
+	heartbeat_interval: 1
+)
+```
+
+### Topics
+
+*The Go and Js implementations use string topics - This is likely to be
+updated to topic hashes in later versions - https://github.com/libp2p/rust-libp2p/issues/473*
+
+For Eth2.0 clients, topics are sent as `SHA2-256` hashes of the topic string.
+
+There are two main topics used to propagate attestations and beacon blocks to
+all nodes on the network.
+
+- The `beacon_block` topic - This topic is used solely for propagating new
+	beacon blocks to all nodes on the networks.
+- The `beacon_attestation` topic - This topic is used to propagate
+	aggregated attestations to subscribing nodes (typically block proposers) to
+	be included into future blocks. Attestations are aggregated in their
+	respective subnets before publishing on this topic.
+
+Shards are grouped into their own subnets (defined by a shard topic). The
+number of shard subnets is defined via `SHARD_SUBNET_COUNT` and the shard
+`shard_number % SHARD_SUBNET_COUNT` is assigned to the topic:
+`shard{shard_number % SHARD_SUBNET_COUNT}_attestation`.
+
+### Messages
+
+*Note: The message format here is Eth2.0-specific*
+
+Each Gossipsub
+[Message](https://github.com/libp2p/go-libp2p-pubsub/blob/master/pb/rpc.proto#L17-L24)
+has a maximum size of 512KB (estimated from expected largest uncompressed block
+size).
+
+The `data` field of a Gossipsub `Message` is an SSZ-encoded object. For the `beacon_block` topic,
+this is a `beacon_block`. For the `beacon_attestation` topic, this is
+an `attestation`.
+
+## Eth-2 RPC
+
+#### Protocol Id: `/eth/serenity/beacon/rpc/1`
+
+The [RPC Interface](./rpc-interface.md) is specified in this repository.
+
+## Discovery
+
+Discovery Version 5
+([discv5])(https://github.com/ethereum/devp2p/blob/master/discv5/discv5.md)
+will be used for discovery. This protocol uses a UDP transport and specifies
+its own encryption, ip-discovery and topic advertisement. Therefore, it has no
+need to establish establish streams through `multistream-select`, rather, act
+as a standalone implementation that feeds discovered peers/topics (ENR-records) as
+`multiaddrs` into the libp2p service.