Each coin was bought for ₹1,00,000. Profit or loss on sale:
Coin A
Coin B
Tax you owe, same scale
India's rule: 30% of gains
If losses could offset
Net result
Tax you owe
In hand after tax
Extra from no set-off

Source: Income-tax Act s.115BBH, s.194S (Finance Act 2022). Cess ignored. Amounts are assumptions.