Bitkey's https://support.bitkey.world/hc/en-us/articles/41831614173460-What-is-the-private-wallet-update answers this more specifically: when its server co-signs, it can temporarily see the wallet balance, not just the payment you're making. Bitkey says it doesn't log that balance. Chain code delegation limits ongoing address derivation by the server, but 'doesn't retain it' and 'cannot see it' are different privacy claims. I'd compare those exact cases with each assisted-recovery provider's documentation.
Bitkey's https://support.bitkey.world/hc/en-us/articles/41831614173460-What-is-the-private-wallet-update answers this more specifically: when its server co-signs, it can temporarily see the wallet balance, not just the payment you're making. Bitkey says it doesn't log that balance. Chain code delegation limits ongoing address derivation by the server, but 'doesn't retain it' and 'cannot see it' are different privacy claims. I'd compare those exact cases with each assisted-recovery provider's documentation.