zcash_workflow_v1

Zcash ledger, first connect:

• Address generation
• Sharing address with host
• Sharing IVK with host //TODO: change to APDU API

Zcash ledger, syncing

• Sharing IVK with host
• Decrypt incoming notes and verification note commitments
• TODO: what to do with matching notes?

Zcash ledger, make shielded transaction phase 1

• Verify outputs on screen

Zcash ledger, make shielded transaction phase 2

• Process outputs and store in flash
• Compute hash of all outputs

Zcash ledger, make shielded transaction phase 3

• Process spends and store in flash
• Store RCM values in flash
• Compute hash of all outputs

Zcash ledger, make shielded transaction phase 4

• Host gives all remaining transaction (meta) data
• Ledger does the complete TX_HASH_ALL
• Final approval of transaction?
• Ledger signs the necessary parts and shares with host
• Host sends transaction blob to network