Ordinals
Ordinals are a system for tracking and transferring satoshis, Bitcoin's smallest units and attaching data to satoshis. When such attachment of data to satoshi happens an inscription is created. Inscription content is entirely on-chain, stored in taproot script-path spend scripts forever. These scripts receive witness discounts, making inscription content storage relatively economical.
How to create an inscription
Inscriptions are created using taproot script. That means you have to use a P2TR type of address to be able to create the inscription.
Wallets that support taproot addresses
BOB MetaMask Snap (Browser only)
You can use the BOB MetaMask Snap with MetaMask.
Live Demo
Check out the live demo at testnet.gobob.xyz/demo/ordinals.
Documentation and example code
Check out the documentation, the BOB MetaMask snap code, and the demo code.