Blocks are identified by their hash, so if you can create a collision between two blocks, there's no way for anyone to know which one is the legit one.
Also, inside a block itself, transactions are part of a Merkle Tree[1], so if you can find a SHA-256 collision, you can also create confusion on what transaction where actually included in a given block.
You cannot really “find a solution around it” for two reasons:
1- the bitcoin blockchain is immutable, so the old blocks can't really be rewritten to work with another hashing mechanism. What you could do is reboot the bitcoin blockchain with another hash algorithm, with a Genesis block summarizing the last know state of the bitcoin blockchain. But that would need consensus among the entire bitcoin community, which will never happen because of reason #2
2- Bitcoin miners own millions of dollars of custom hardware designed for SHA-256 generation (mining), there's no way they'll just be like “OK, let's change hash function, I'll throw this useless stuff away and buy new ones”.
Also, inside a block itself, transactions are part of a Merkle Tree[1], so if you can find a SHA-256 collision, you can also create confusion on what transaction where actually included in a given block.
You cannot really “find a solution around it” for two reasons:
1- the bitcoin blockchain is immutable, so the old blocks can't really be rewritten to work with another hashing mechanism. What you could do is reboot the bitcoin blockchain with another hash algorithm, with a Genesis block summarizing the last know state of the bitcoin blockchain. But that would need consensus among the entire bitcoin community, which will never happen because of reason #2
2- Bitcoin miners own millions of dollars of custom hardware designed for SHA-256 generation (mining), there's no way they'll just be like “OK, let's change hash function, I'll throw this useless stuff away and buy new ones”.
[1]: https://en.wikipedia.org/wiki/Merkle_tree