> For the complete documentation index, see [llms.txt](https://tokens-economy.gitbook.io/consensus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tokens-economy.gitbook.io/consensus/chain-based-proof-of-capacity-space/proof-of-ownership.md).

# Proof of Ownership

This technique can be used by artists or businesses to certify the integrity, date of publication and ownership of their creations or contracts. A Proof of Ownership is always attached to a piece of data using cryptographic functions. This makes it impossible to alter the data after certification. If the content is modified, even by a single bit, then the whole certificate becomes invalid.

Only the people with the private key associated with the signature can prove they are the owner.