Thorchain is non-custodial and without kyc.
To get the best rate, you have to:
1) Install Metamask
2) Connect to
https://app.shapeshift.com3) Install the Multichain Snap into Metamask
4) "My Wallet" on Shapeshift -> Deposit Bitcoin
5) Trade/Bridge
6) Use "Thorchain - Streaming" offer
7) If you want, disable "ShapeShift Donation".
If you want to exctract the Bitcoin private key:
1) Download "bip39-standalone.html" from
https://github.com/iancoleman/bip39/releases .
2) Put the Metamask passphrase on "BIP39 Mnemonic"
3) On "Derivation Path" select "BIP44".
Or
Import your Metamask passphrase into a BIP44/HDWallet compatible Bitcoin wallet.