We hear of the 55 Signers on July 4th and seldom find explanation why there are actually 56 Signatures.
The story goes that Matthew, a favored statesman returned to the Continental Congress assembled in October. By early November he had the permission to add his signature in Approbation and so he did. This is confirmed in the Notes at the bottom of the Page:
This is not just the honor of being able to bond my Life, Estate and Sacred Honor - it also grants me the entitlements of being Party to the Contract, the contract being the Constitution of the United States and also any subsequently formed trusts like state constitutions.
The only other way I know of to become party to the contract, so long after-the-fact is to sign a binding fidelity bond.
Sometimes I think that one must have some training at trust law to grasp my signature as First Redeemer on certain documents. I strongly suggest you download this Interlocutory Appeal for study.
Happy Fourth of July!! I hope you have a quiet one, like I enjoy.