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SIGN is the heart of Sign Protocol (an ecosystem that includes tools like EthSign), a platform that acts as a global "digital notary" for the new era of the internet. Its primary function is to provide legal validity and trust to online interactions, allowing users to sign contracts, agreements, and verify documents directly on the blockchain. Unlike traditional electronic signatures (like those used on PDFs), this technology leaves an immutable and transparent record, eliminating the risk of forgery and the need for costly intermediaries to certify an agreement. The most interesting utility for the user is its ability to manage their identity and credentials with a higher level of privacy. The token allows the use of services where you can prove things about yourself (like being of legal age, having a degree, or owning an account) without the need to reveal your sensitive personal data to the public. It's an attractive option for those looking to operate in the digital world with the assurance that their agreements and their identity are protected by cutting-edge cryptographic technology, serving as a bridge between the laws of the real world and the digital economy.