Interpretations of legalistic esoterica like “chain of custody” are not what makes the governing document valid or invalid.
Ultimately it is the willing compliance of the bulk of the legitimate electorate (as distinct from the general population) that makes The Constitution the Law of the Land.
Just as that Constitution is currently being ignored, vilified and trampled by lawless usurpers, it can be reenforced by a simple show of will by the electorate or (in an extreme case) by the forcible removal of the offending traitors.
Either way, it is the de facto allegiance that the document is given which establishes its de jure validity.
The 10th Amendment is a perfect case in point. It has long been held in de facto contempt by the Federal Government and the passive acquiescence of the States. For this Amendment to have any validity outside of being a de jure oddity, it will take concrete action and defiance - to the point of armed resistance - on the part of the States. In fact this is why the 2nd Amendment calls on every citizen to be armed as a potential militiaman for his respective State.
A large part of the genius behind the Bill of Rights is that the various parts serve to support one another, this being an optimal example.
The Articles of Confederation required all states to ratify an amendment to the Articles of Confederation. The Founders decided to repeal and replace the Articles of Confederation with the US Constitution. To facilitate repeal and replacement, Article VI stated nine of thirteen states were needed to ratify the US Constitution. Two states ratified the US Constitution after President Washington was sworn in as the first President of the United States.
Constitutional law requires all law to be authenticated, published and archived as evidence of the existence of law. Without evidence of law maintained by an executive officer in compliance with the law, the law is voided.
Currently, the people have elected a unitary executive to manage the affairs of the union. As a consequence, the Congress, the Federal courts, and the Executive Branch federal officers acquiesce to maintain continuity of operations until a replacement document is ratified by the majority.