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Taking 64 bytes of the HMAC digest, the first 32 bytes are the chain code, and the second 32 bytes<refname="curve-order" /> are the private key for the BIP32 XPRV value. Child number, depth, and parent fingerprint are forced to zero.
{{Warning|BIP32 reverses the above by taking the first 32 bytes as the private key, and the second 32 bytes as the chain code.}}
{{Warning|The above is the inverse of BIP32, which takes the first 32 bytes as the private key, and the second 32 bytes as the chain code.}}
Applications may support Testnet by emitting TPRV keys if and only if the input root key is a Testnet key.