about authenticity
verification records for physical coins
purpose
Authentic.cosigo.io is a public verification record system for physical coins.
The goal is simple: record measurable physical properties of a coin in a clear and transparent way so that anyone can review the measurements and understand how the verification result was obtained.
Each record includes measurements such as weight, displacement volume, and density, along with reference images and documentation.
what is measured
primary measurement
Water displacement is used to estimate the physical volume of the coin.
density = coin mass ÷ displaced volume
The resulting density is compared against the expected density of the claimed material.
secondary cross-check
Dimensions such as diameter and thickness can be used to estimate volume assuming an ideal geometric shape.
Because real coins are not perfect cylinders, this geometry calculation is only a cross-check and not the primary verification method.
what this system is not
This site does not claim to replace professional grading services.
This system does not guarantee authenticity of a coin. It records measured properties and compares them to expected values.
A density match supports the claimed material but does not verify mint origin, strike authenticity, or numismatic grade.
Additional inspection and expertise may be required for rare or valuable coins.
why publish the data
Traditional authenticity claims are often opaque. Measurements are performed but the underlying process is rarely visible.
Authentic.cosigo.io publishes the measurement process openly so that anyone can review the numbers, understand the method, and repeat the test if desired.
Transparency improves trust.
cosigo project
Authentic.cosigo.io is part of the broader Cosigo project, which focuses on transparency, physical value measurement, and open verification systems.
Where possible, measurements are expressed using direct physical quantities such as grams, volume, and density rather than subjective claims.
record structure
Each certificate record typically includes:
• coin specification
• weight measurement
• water displacement measurement
• calculated density
• comparison to expected density
• reference images
The goal is clarity and repeatability rather than complexity.
summary
Authentic.cosigo.io provides a transparent record of measurable properties for physical coins.
By publishing the measurement method and the resulting calculations, the verification process becomes easier to understand and easier to reproduce.
Verification should be observable, repeatable, and open to review.