Meeting Notes

From December 3rd, 2019

lnurl

• is a side-channel communication mechanism
• is a network spec (flexible, non strict)
• addresses user experience issues

Merchant <-> NODE < - - - - - > NODE <-> Client

• is a BECH32 QR code
  • less info than LN invoice (hard to read for apps, too much data)
  • will make a request to some server
  • returns an invoice that customer app can pay
  • merchant can decide on scheme of the URL (example.com/tshirt/1234)
• SPEC:
  • open channels
  • return invoices
  • sign
  • authentication

• Possible application: offline ATM without being connected to a node (ie. decouple ATM from node)

• hopefully, these side-channel solutions would be integrated in BOLT, the LN spec.

Schnorr

• Current signature algorithm in bitcoin is ECDSA
• Wasn’t used in original bitcoin implementation because it was patented, so there wasn’t much tooling or libraries at the time (2008)
• Has advantages over ECDSA:
  • smaller signatures
  • can add signatures together (signature aggregation)
• Can be added via softfork
• Questions:
  • How does schnorr signature aggregation actually work?
  • Privacy benefits?

Bitcoin Core latest release (0.19.1)

• bech32 addresses by default in GUI
• bip158: compact block filters (neutrino) instead of bloom filters
• 1000 commits, 100 contributors:
  • what is in those commits?

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