Neither the node nor the miner needs a mnemonic. The node needs only the
32-byte preimage, from which it derives the reward address; the mining
protocol carries no reward address at all, so the miner cannot know it.
Deriving an inner_hash from a wallet is a one-time offline step and has
no business happening on the deploy workstation. infra-setup.sh now
accepts only the inner_hash, validates it is 0x + 64 hex, and refuses a
mnemonic outright. quantus-node itself refuses --words/--seed as argv
for the same reason: argv is world-readable and recorded in shell
history and audit logs.
This drops the seed phrase, the temporary binary download and the local
key derivation from the provisioning path entirely.