• SR Sequencer Coordination
  • Bedrock enforced coordination between sequencers.
  • Can use round robin with a block height based timeout to deal with crashed sequencers
  • Sequencers fall back to reconstructing from DA if a sequencer does not receive the data from the previous sequencer
  • block timeout should be long enough for the sequencer to fully reconstruct block data from DA
  • Sequencers optimistically shares full block with next sequencer
  • Need to define protocol for making changes to the sequencer set
  • Need to define expected behaviour in case a sequencer publishes garbage to the channel
    • Could be a simple as skipping the message.
  • wild idea: We may have a fallback where a channel becomes completely unpermissioned if there hasn’t been any messages published after a sufficiently large amount of time.
• Bridging LOGO from Bedrock to LSSA.
  • Mint only on Bedrock
  • LSSA sequencer maintains a well known pk on bedrock
  • L1 → L2 is done through a transfer to pk
    • sequencer mints equiv. amount in LSSA
  • L2 → L1 is done through burning inside LSSA
    • sequencer releases the LOGO on bedrock.
• Asynchronous Messaging between SR’s
  • Two options:
    • Rely on sequencers reading, parsing and validating full blocks from other SR in order to detect cross-SR messages
      • simplest approach, but may be a bit heavy
    • Include a cross-SR mailbox in the channel with a bedrock enforced message structure.
      • problems with this is that we don’t have validity proofs that a chanel messages are valid transitions, if there are multiple sequencers, and one is malicious, it may post a message to the mailbox without the corresponding transaction inside the SR block.
• dual keys for UTXOs
  • a zkSign key for use in PoL
  • a ed25519 key for use with traditional wallets (with hardware wallet support)
  • A signature from either of these keys would authorize spending.
• Is a separate concept of Mantle useful in the bedrock ontology? Can we replace mantle with just the “bedrock transaction”?