Define audit scope + document basic functionality

[bkontur]

Design doc for Bulletin as parachain: https://docs.google.com/document/d/1NFFt8iITx7jCPewGbjAQKvcwQgnb6i9-ZVE4brPc8Nw/edit (if not accessible, please request)

Audit scope

☑️ - ready to audit
🚧 - in-progress, not ready yet
❓- questionable, still not decided

Relevant runtime code paths:

• ☑️ Bulletin Westend (normal) parachain: https://github.com/paritytech/polkadot-bulletin-chain/tree/main/runtimes/bulletin-westend
• 🚧 Bulletin Polkadot (normal) parachain: Add polkadot bulletin parachain #164 (in-progress, but it should be exact copy/configuration as for Westend above)

---

• ☑️ Node implementation
  • ☑️ polkadot-parachain / polkadot-omni-node support: Bulletin as parachain missing features polkadot-sdk#10662
    • custom inherent data provider for check_proofs
    • added transaction index host functions
    • configurable StoragePeriod -> RetentionPeriod plus runtime API
  • ☑️❓ Bitswap support (related to IPFS)
    • BitswapServer
    • litep2p Bitswap impl
• Runtime implementation
  • ☑️ Pallets
    • ☑️ polkadot-bulletin-chain/pallets/transaction-storage
      • 🚧 Removal of ValidateUnsigned trait usage for unsigned transactions: Validate unsigned -> pallet::authorize #194
  • Runtime configuration itself (block sizes/times, origins, tx extensions, root access, ..)
    • ☑️ Pallets configuration
    • ☑️ XCM configuration

[bkontur]

@antkve when #133 is ready please, update the scope here