For chains supported at the Tier 2 level, you can invoke Privy’s raw sign functionality to sign over a hash, e.g. the hash of a transaction. You can then use the returned signature to submit and send your transaction. Alternatively, you can provide theDocumentation Index
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bytes to hash with a specific encoding and a hash_function, and get the same response.
For examples of how to use raw sign for a specific chain, see this recipe.