How can Magento stores integrate blockchain-based payment wallets for crypto transactions?

We are evaluating alternative payment methods for a Magento-based eCommerce platform. One option under consideration is allowing customers to pay using blockchain wallets and cryptocurrencies.

I would like to understand:

What Magento extensions support crypto wallet payments?
Are there recommended APIs for integrating blockchain wallet authentication?
How do merchants handle transaction confirmations and refunds?
What security considerations should be taken into account when connecting external wallet providers?

Has anyone implemented a similar solution in Magento 2 and can share their experience?