Getting 'Signature verification failed' in methods.x.view()

[metaproph3t]

When I try to use the .view() functionality provided by Anchor, I get a 'Signature verification failed' error.

For example, the following code gives this error (in bankrun, but not in normal anchor):

await clobProgram.methods                                                                                                                         
        .getMarketMakerBalances(failMM.publicKey)                                                                                                       
        .accounts({                                                                                                                                     
          orderBook: failMarket,                                                                                                                        
        })                                                                                                                                                                                                                                                                        
       .view();

A workaround is to pass the signer as a payer, like so:

await clobProgram.methods                                                                                                                         
        .getMarketMakerBalances(failMM.publicKey)                                                                                                       
        .accounts({                                                                                                                                     
          orderBook: failMarket,                                                                                                                        
        })                                                         
       .signers([payer])                                                                                                                                                                                                               
       .view();

[kevinheavey]

For the first code block, can you check if the ._signers attribute is empty in both regular anchor and anchor-bankrun? One guess is that BanksServer is checking signatures and solana-test-validator is not

[GuidoDipietro]

The standard simulateTransaction RPC method has additional config parameters such as sigVerify and replaceRecentBlockhash which are used extensively across different implementations, as we often don't care about those aspects when simulating a tx (such as when calculating CU).

Perhaps it is related to that?