'the solution at hand' is correct and usable in written English.
It is typically used in reference to the most accessible or immediately available solution to a problem. For example, "We need to solve the budget deficit; the solution at hand is to reduce spending."
No matter how secure the solutions at hand, current crypto custody solutions have another set of weak spots: mobile operators, browsers, app stores and ad platforms have become the main target of hackers to steal your funds.
We have the solutions at hand, and people are now standing up and voicing their interest to be powered by clean renewable energy.
But just because change makes rational sense -- and despite the solutions at hand -- we continue to follow the same routines we've followed for decades.
And we have the opportunity to press for the solutions at hand that hold out hope for today and promise for tomorrow.
We have the solutions at hand: We must continue working at both policy and program levels to upgrade and increase access to emergency obstetric care, train more surgeons and health care professionals and partner with communities to raise awareness of the need for skilled care at delivery and family planning.
Meanwhile, the certainty of human back pain, like the inevitability of labor pains, is evidence of the jury-rigged, best-solution-at-hand nature of evolution.
As no existing technology can be surrogated by another one, the coexistence of today wireless networks is the best solution at hand when dealing with the incessantly growing user demand for bandwidth.
The solution is at hand and urgently needed: Wire the subway for cellphone service.
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