...Ordinal theory does not require a sidechain or token aside from Bitcoin, and can be used without any changes to the Bitcoin network. It works right now. ord is an index, block explorer, and command-line wallet. It is experimental software with no warranty. Ordinal theory imbues satoshis with numismatic value, allowing them to be collected and traded as curios. Ordinal numbers are serial numbers for satoshis, assigned in the order in which they are mined, and preserved across transactions. ord relies on Bitcoin Core for private key management and transaction signing.