Most blockchain infrastructure projects make a fundamental architectural choice early: which chain do they build on? This choice shapes everything downstream, the developer community they attract, the protocols they can integrate with, the users they can serve, and the institutional partnerships they can form.
Sign Protocol made a different choice. Rather than optimizing for one chain, it built an attestation layer that operates simultaneously across Ethereum, BNB Smart Chain, Base, Starknet, Solana, TON, and Move-based networks. A credential created on Ethereum is natively verifiable on Solana without a bridge, without wrapping, and without rebuilding the verification infrastructure on each chain.
This matters for a specific reason that becomes obvious in enterprise and government deployments. A national government cannot commit its entire digital identity infrastructure to Ethereum and accept that any future interaction with Solana-native systems requires rebuilding from scratch. An enterprise managing supply chain credentials across multiple blockchain networks cannot maintain separate verification systems for each. The fragmentation cost is too high.
The technical architecture that makes this possible involves a schema registry that standardizes how attestations are structured across chains, an indexing layer through SignScan that makes attestations queryable from any network, and Arweave-based storage that ensures data persistence independent of any single chain's availability.
The competitive landscape is instructive. Civic, SelfKey, and Worldcoin each address parts of the identity and verification problem. None operates natively across the full range of chains Sign supports. Each is optimized for specific use cases and ecosystems. Sign's advantage is not that its verification is more sophisticated on any single chain. It is that the same verification infrastructure works identically across all of them.