Establishing a true identity on the internet is a constant challenge, but each successive attestation on Bitcoin shows a true economic interaction among network participants, further evidence of the realness or tangibility of an intangible digital currency.

Each Bitcoin transaction is an attestation to the integrity of the system. Once a transaction is seen and attested to by each node for validity, miners put them into blocks. These miners distribute the candidate blocks and mining resumes, adding attestation to the heaviest chain by accumulated proof of work.