I am willing to try any reasonably promising effort at providing provenance of transplant material, or identity of the trafficked, that provides assurance such a registry won't be used to augment the surveillance state.
I reckon that public auditability and identification are features of the idea that aren't easily dismissed, and that 'seals of approval' are assurances of expropriation and perversion of any public service by forces of corruption.
I have little familiarity with extant mechanisms, that I am sure must exist, to assure provenance of transplant material, but am certain they have failed, and that they involve such 'seals of approval'.
It is the auditability of the blockchain by the public that provides any assurance of integrity. I cannot overstate my cynicism regarding integrity of government, or any other authority. I have direct personal experience with my HIPAA data being provided to nefarious parties.
I cannot trust any attestation of integrity. The integrity of such a system is only potential insofar as it is publicly auditable, IMHO.