How each one stays private
BTC
Sent as a silent payment (BIP‑352): each payment lands at a fresh address that only the recipient’s key can find, so nothing on chain ties it to their published address. The amount and your own Bitcoin address show.
TAC
Paid inside the shielded pool on Bitcoin, with a zero-knowledge proof made on this device. Posted by the relay for a fee in TAC, it hides who paid, who was paid and how much; posted from your own Bitcoin address, that address shows as the sender.
ETH
Paid inside the shielded pool on Ethereum, Base or Robinhood Chain, proved on this device and sent by a relay: no gas, and nothing on chain links payer and payee. Deposits and withdrawals show.