Action State Group, Inc. Tyche Institute Independently written systems that anchor records to a SCITT Transparency Service repeatedly need the same construction: a canonical form of structured content, a content-addressed identifier derived from that form, binding to a SCITT Signed Statement and Receipt, and references that cite external artifacts by digest. This document, referred to as CPB, specifies that construction as declarations rather than as a payload format. A payload profile declares its canonicalization algorithm and exclusion set and thereby obtains a reproducible derived identifier. A CPB Signed Statement carries either the complete statement content as specified by RFC 9943 or a digest of content held elsewhere using the COSE Hash Envelope of RFC 9995. CPB also defines an abstract typed digest reference information model and one optional protected-header encoding, cpb-refs; a payload profile may instead define its own reference serialization. An IANA registry assigns the canonicalization algorithm identifiers that these declarations name. CPB does not define payload content formats, establish or require a universal artifact-type registry, or require either typed-reference carrier.