Colored Coins is a concept that proposes using the Bitcoin blockchain not only to transfer the cryptocurrency itself, but also to keep track of other assets. The idea is to attach additional attributes to a certain minimal amount of bitcoin (satoshis) — to «color» them. After such marking, these coins are no longer perceived as ordinary money and begin to represent something else: a stake in a company, a right to a product, a coupon, a ticket, or a project's internal token.

The mechanism works by recording metadata into the transaction. The network continues to process the transfer as a standard bitcoin operation, but special software and wallets recognize the «color» and interpret such coins as a separate asset class. Thanks to this, participants can transfer ownership rights without intermediaries, relying on the reliability and transparency of the underlying blockchain.

Where colored coins are used

• issuing digital shares and stakes;
• tokenizing tangible and intangible assets;
• creating coupons, vouchers, and certificates;
• recording ownership rights and licenses.

The concept of colored coins was one of the early approaches to tokenization and in many ways foreshadowed the emergence of more advanced platforms for issuing tokens. Its limitations stem from the fact that the Bitcoin blockchain was not originally designed for complex smart contracts, so over time many tokenization tasks migrated to specialized networks.