I am using 12.3 tezos blockchain integration now, and I try to do a complete transfer transaction using Wolfram language. in parallel and at the beginning I install tezos-client in my linux server, and am able to open two accounts with some free t3 from this faucet site, with the help of tezos-client command line program, I am be able to do the workflow in the attached notebook file, until the step I need to sign the transaction.
It looks to me this Tx sign function can not pick up private key from the tezos json wallet file in general, I use tezos-client tezos-client show address <account> --show-secret to show the keys and paste the secret key to the sign function, but it won't take it.
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