The process of importing wallets or private keys into Turnkey is broken up into three primary steps:
1

Initialize the import process. This produces an import bundle, containing a public key and signature. These artifacts will be used in the next step to ensure that key material is only accessible by Turnkey, and cannot be extracted by any man-in-the-middle (MITM)
2

Encrypt the key material to the artifacts from the previous step
3

Import the encrypted bundle to Turnkey
See the Enclave to end-user secure channel for more technical details.

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Implementation Guides

See Code Examples for more details.