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3		-This page contains an overview of all P4P Networks in this wiki and their building blocks.
	4	+== 15 Building Blocks of P4P Networks ==
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5		-You can also [[add a P4P Network>>doc:Projects.WebHome]] or have a look at the [[P4P Applications>>doc:P4P.Applications.WebHome]].
	6	+To fully assemble a P4P network one needs a few different building blocks, below is an overview of 15 of those building blocks.
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	18	+==== **1. Data Synchronization** ====
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13		-== Building Blocks of P4P Networks ==
	20	+> Synchronization answers **how updates flow between peers** and how they determine what data to exchange. This layer is about **diffing, reconciliation, order, causality tracking, and efficient exchange**, not persistence or user-facing collaboration semantics.
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	22	+* //How do peers detect differences and synchronize state?//
	23	+* Examples: Range-Based Set Reconciliation, RIBLT, Gossip-based sync, State-based vs op-based sync, Lamport/Vector/HLC clocks, Braid Protocol
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18		-Lost in translation? Take a look at the [[terminology>>doc:P4P.Definitions.WebHome]].
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21		-To fully assemble a P4P network one needs a few different building blocks. The following is an overview of the building blocks needed for P4P networks.
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	27	+==== **2. Collaborative Data Structures & Conflict Resolution** ====
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	29	+> This layer defines **how shared data evolves** when multiple peers edit concurrently. It focuses on **conflict-free merging, causality, and consistency of meaning**, not transport or storage. CRDTs ensure deterministic convergence, while event-sourced or stream-driven models maintain a history of all changes and derive consistent state from it.
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	31	+* //How do peers collaboratively change shared data and merge conflicts?//
	32	+* Examples: CRDTs (Yjs, Automerge), OT, Event Sourcing, Stream Processing, Version Vectors, Peritext
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	36	+==== **3. Data Storage & Replication** ====
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	38	+> This layer focuses on **durability, consistency, and redundancy**. It handles write-paths, crash-resilience, and replication semantics across nodes. It is the “database/storage engine” layer where **data lives and survives over time**, independent of sync or merging logic.
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	40	+* //How is data persisted locally and replicated between peers?//
	41	+* Examples: SQLite, IndexedDB, LMDB, Hypercore (append-only logs), WALs, Merkle-DAGs (IPFS/IPLD), Blob/media storage
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	43	+
	44	+
	45	+==== **4. Peer & Content Discovery** ====
	46	+
	47	+> Discovery occurs in two phases:
	48	+> 1. **Peer Discovery** → finding _any_ nodes
	49	+> 2. **Topic Discovery** → finding _relevant_ nodes or resources
	50	+> These mechanisms enable decentralized bootstrapping and interest-based overlays.
	51	+
	52	+* //How do peers find each other, and how do they discover content in the network?//
	53	+* Examples: DHTs (Kademlia, Pastry), mDNS, DNS-SD, Bluetooth scanning, QR bootstrapping, static peer lists, Interest-based routing, PubSub discovery (libp2p), Rendezvous protocols
	54	+
	55	+
	56	+
	57	+==== **5. Identity & Trust** ====
	58	+
	59	+> Identity systems ensure reliable mapping between peers and cryptographic keys. They underpin authorization, federated trust, and secure overlays.
	60	+
	61	+* //How peers identify themselves, authenticate, and establish trustworthy relationships?//
	62	+* Examples: PKI, Distributed Identities (DIDs), Web-of-Trust, TOFU (SSH-style), Verifiable Credentials (VCs), Peer key fingerprints (libp2p PeerIDs), Key transparency logs
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	64	+
	65	+
	66	+==== **6. Transport Layer** ====
	67	+
	68	+> This layer provides logical connections and flow control. QUIC and WebRTC bring modern congestion control and encryption defaults; Interpeer explores transport beyond IP assumptions.
	69	+
	70	+* //How do peers establish end-to-end byte streams and reliable delivery?//
	71	+* Examples: TCP, UDP, QUIC, SCTP, WebRTC DataChannels, Interpeer transport stack
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	73	+
	74	+
	75	+==== **7. Underlying Transport (Physical/Link Layer)** ====
	76	+
	77	+> Highly relevant for **offline-first / edge networks**, device-to-device communication, and mesh networks and relates to the hardware which facilitates connections.
	78	+
	79	+* //How does data move across the medium?//
	80	+* Examples: Ethernet, Wi-Fi Direct / Wi-Fi Aware (post-AWDL), Bluetooth Mesh, LoRa, NFC, Cellular, CSMA/CA, TDMA, FHSS
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	82	+
	83	+
	84	+==== **8. Session & Connection Management** ====
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	86	+> Manages **connection lifecycle**, including authentication handshakes, reconnection after drops, and session continuation—especially important in lossy or mobile networks.
	87	+
	88	+* //How are connections initiated, authenticated, resumed, and kept alive?//
	89	+* Examples: TLS handshake semantics, Noise IK/XX patterns, session tokens, keep-alive heartbeats, reconnection strategies, session resumption tickets
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	91	+
	92	+
	93	+==== **9. Content Addressing** ====
	94	+
	95	+> Content addressing ensures **immutability, verifiability, and deduplication**. Identity of data = cryptographic hash, enabling offline-first and tamper-evident systems.
	96	+
	97	+* //How is data addressed and verified by content, not location?//
	98	+* Examples: IPFS CIDs, BitTorrent infohashes, Git hashes, SHA-256 addressing, Named Data Networking (NDN)
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	100	+
	101	+
	102	+==== **10. P2P Connectivity** ====
	103	+
	104	+> Connectivity ensures peers bypass NATs/firewalls to reach each other.
	105	+
	106	+* //How can two peers connect directly across networks, firewalls, and NATs?//
	107	+* Examples: IPv6 direct, NAT Traversal, STUN, TURN, ICE (used in WebRTC), UDP hole punching, UPnP
	108	+
	109	+
	110	+
	111	+==== **11. Session & Connection Management** ====
	112	+
	113	+> Manages **connection lifecycle**, including authentication handshakes, reconnection after drops, and session continuation.
	114	+
	115	+* //How are connections initiated, authenticated, resumed, and kept alive?//
	116	+* Examples: TLS handshake semantics, Noise IK/XX patterns, session tokens, keep-alive heartbeats, reconnection strategies, session resumption tickets
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	118	+
	119	+
	120	+==== **12. Message Format & Serialization** ====
	121	+
	122	+> Serialization ensures **portable data representation**, forward-compatible schemas, and efficient messaging. IPLD provides content-addressed structuring for P2P graph data.
	123	+
	124	+* //How is data encoded, structured, and made interoperable between peers?//
	125	+* Examples: CBOR, Protocol Buffers, Cap’n Proto, JSON, ASN.1, IPLD schemas, Flatbuffers
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	127	+
	128	+
	129	+==== **13. File / Blob Synchronization** ====
	130	+
	131	+> Bulk data syncing has **different trade-offs** than small collaborative state (chunking, deduplication, partial transfer, resume logic). Critical for media and archival P2P use-cases.
	132	+
	133	+//How are large objects transferred and deduplicated efficiently across peers?//
	134	+Examples: BitTorrent chunking, IPFS block-store, NDN segments, rsync-style delta sync, ZFS send-receive, streaming blob transfers
	135	+
	136	+
	137	+==== **14. Local Storage & Processing Primitives** ====
	138	+
	139	+> Provides durable on-device state and local computation (event sourcing, materialization, compaction). Enables offline-first writes and deterministic replay.
	140	+
	141	+* //How do nodes persist, index, and process data locally—without external servers?//
	142	+* Examples: RocksDB, LevelDB, SQLite, LMDB, local WALs/append-only logs, embedded stream processors (NATS Core JetStream mode, Actyx-like edge runtimes), Kafka-like libraries
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	144	+
	145	+
	146	+==== **15. Crash Resilience & Abortability** ====
	147	+
	148	+> Ensures P2P apps don’t corrupt state on crashes. Tied to **local storage & stream-processing**, and critical in offline-first and distributed update pipelines. Abortability is the updated term for Atomicity as part of the ACID abbreviation.
	149	+
	150	+* //How do nodes recover and maintain correctness under failure?//
	151	+* Examples: WALs, idempotent ops, partial log replay, transactional journaling, write fences
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	163	+{{box title=" **Contents**"}}
	164	+{{toc depth="5"/}}
	165	+{{/box}}
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30	30	== Distributed Network Types ==
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37	37	== Overview of P4P Networks ==
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39	39	{{include reference="Projects.WebHome"/}}
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