[erik-sv]

Adds two text soft binding algorithms from Encypher.

Submitter: Erik Svilich, Encypher Corporation, which owns both algorithms. Contact: c2pa@encypher.com.

com.encypher.text.watermark.1 (watermark, text)

• Encypher embeds an invisible identifier in text when it signs it, alongside the C2PA Manifest. The text renders unchanged.
• The identifier can be extracted from the full text, from a copied excerpt of sufficient length, or from lightly edited text. Encypher resolves it to the C2PA Manifest, including when the embedded manifest has been removed.
• Supports embedding and extraction for manifest recovery. Proprietary; patent pending.
• Documentation: https://encypher.com/c2pa/soft-binding/text-watermark

com.encypher.text.fingerprint.1 (fingerprint, text)

• SHA-256 of the Unicode NFC-normalized visible text, computed before any Encypher marks or the embedded manifest are added. Recorded as a 32-byte value in a single block with an empty scope.
• Fully specified, with test vectors, so any repository can compute and index it. Matches exact copies only.
• Documentation: https://encypher.com/c2pa/soft-binding/text-fingerprint

Notes

• Identifiers 56 and 57 assume the open PRs claiming 55 land first. Happy to renumber.
• The schema validates locally with jsonschema validate softbinding-algorithm-list.schema.json softbinding-algorithm-list.json, and both informational URLs resolve.