Prepare Evidence for Signing

Prepares an in-toto statement for external signing. Returns the DSSE payload (base64-encoded) and the URL to POST the signed envelope to.

This is the first step in a two-step evidence creation flow:

  1. Call this endpoint to prepare the statement and receive the DSSE payload
  2. Sign the payload externally and POST the signed DSSE envelope to the returned post_url
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