Trustless bridge (EVM->native): frontend development - basic

[taokayan]

transfer from EVM -> native
transfer from native -> EVM

• The list of tokens should be unified (constrained/unconstrained) as one list in the UI
• UI for native to EVM flow is the same, regardless of token type
• UI for EVM to native will differ based on whether constrained or unconstrained
  • Unconstrained requires a two-stage process: first acquiring approval from the token contract for the amount requested to be sent, followed by confirming the transfer