Settlement & Liquidity
for Bitcoin DeFi

import { OP20, u256, Address, Revert } from '@btc-vision/opnet';

@contract
export class SettlementVault extends OP20 {

  // Escrow balances: issuer → token → amount
  private escrow: Map<Address, Map<Address, u256>> = new Map();

  @external
  public deposit(token: Address, amount: u256): void {
    const sender = Context.caller();
    OP20.transferFrom(token, sender, Context.self(), amount);
    this._credit(sender, token, amount);
    Emit.Deposited(sender, token, amount);
  }

  @external
  public settle(recipient: Address, token: Address, amount: u256): void {
    const issuer = Context.caller();
    if (this._balance(issuer, token) < amount) throw new Revert("Insufficient escrow");
    this._debit(issuer, token, amount);
    OP20.transfer(token, recipient, amount);
    Emit.Settled(issuer, recipient, token, amount);
  }

  @view
  public liquidityOf(issuer: Address, token: Address): u256 {
    return this._balance(issuer, token);
  }
}