Trade crypto in India with proof, not promises

-- One Release, One Time
UPDATE trades
SET status = 'released',
    released_at = NOW()
WHERE id = $1
AND status = 'confirmed'
AND (SELECT COUNT(*) FROM releases
     WHERE trade_id = $1) = 0;

// Your Wallet, Your Chain
async function releaseFunds(trade) {
  const buyer = await getBuyer(trade.buyer_id);

  if (!buyer.registered_wallet) {
    throw new Error('No wallet on file');
  }

  const chain = trade.blockchain; // 'bnb' or 'solana'
  const wallet = chain === 'bnb'
    ? buyer.bnb_wallet
    : buyer.sol_wallet;

  if (!wallet) {
    throw new Error('Wallet mismatch');
  }

  await sendToChain(wallet, trade.amount, chain);
}

// 5 Minutes, Then Done
const SCAN_BLOCKS = 150; // ~7 min on BNB

async function checkDeposit(escrowAddress, tradeId) {
  const currentBlock = await getLatestBlock();
  const startBlock = currentBlock - SCAN_BLOCKS;

  const txs = await scanBlocks(
    escrowAddress,
    startBlock,
    currentBlock
  );

  for (const tx of txs) {
    if (tx.confirmations >= 1) {
      await notifyTradeConfirmed(tradeId, tx.hash);
    }
  }
}