Bearer digital cash is possible on iPhoner

Apple introduced Touch ID with its iPhone 5s, and since then the company has taken user security to the next level. Secure Enclave is a coprocessor embedded in the device that runs completely on its own with its own operating system. Keeping all things security in a separate coprocesser prevents the primary chip from accessing any sensitive data. The coprocesser has its own operating system (SEPOS), which includes a kernel, drivers, and applications.

Uf Apple has done this right then the following is possible. I can can set up my iPhone so the enclave has a secret key even I cannot read.  Thus the iPhone can accept, for example, a bitcoin address and treat that address like a bearer asset. any other iPhone with the same app will exchange bitcoin bits with me without reference to the block chain.  The Blockchain signature is hidden from all human parties.  The app will obey double spending rules.  Then, at any moment, and iPhone holding these bitcoin bits can transfer them to a person address without revealing the secret key or double spend.  And visa versa.