DIP-37: Proposal for a new ticket payment plugin for Devcon 7

[ryanberckmans]

DIP-37: Proposal to adopt the 3cities payment app for Devcon 7 ticketing payments.

3cities is a decentralized, open payments app focused on accessibility, credible neutrality, and supporting many wallets, tokens, currencies, and chains.

Checklist

• Correct markdown (e.g. headers with ##, header surrounded by ---)
• syntax check
• filename is DIP-X.md (with X being the correct DIP number)
• header contains (in this order)
  • DIP
  • Title
  • Status
  • Themes
  • Tags
  • Authors
  • Resources Required (optional)
  • Discussion (with link to devcon forum)
  • Created (in the format year-month-day e.g 2020-4-20)
• contains these sections:
  • Abstract
  • Rationale
  • Implementation
  • Operational Requirements & Ownership
• PR title prefixed with DIP-X

[ryanberckmans]

This DIP has been delivered.

Here is 3cities codebase, open-sourced and MIT-licensed.

The codebase has the

• interface (main payment app running in user's browser)
• verifier (stand-alone verifier module, not yet published to NPM)
• service (verifier as a gRPC service)
• ETH transfer proxy, a stateless hyperstructure smart contract to have ETH transfers emit ERC20-compliant Transfer events
• the pretix python plugin, revamped to use 3cities