A digital coin contains the public key of its owner. To transfer it, the owner signs the coin together with the public key of the next owner. Anyone can check the signatures to verify the chain of ownership. 

 ⚡ ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  ⚡ 

 𝙷𝚊𝚙𝚙𝚢 𝙽𝚎𝚠 𝚈𝚎𝚊𝚛!   🍾🍾🍾