Signature Verification Tools
Confirming a message or transaction was really signed by a given key.
Central to Decentralized.Host. Every assignment, observation, capability, bundle and audit checkpoint is an Ed25519 signature over canonical JSON with a domain-separated context, and 136 published conformance vectors let independent implementations check their verification.
The underlying cryptography
Digital signatures all rest on the same asymmetric-cryptography foundation regardless of context: a private key signs a piece of data, producing a signature that anyone holding the corresponding public key can verify -- confirming both that the claimed signer really produced it (authenticity) and that the data hasn't been altered since (integrity), without the verifier ever needing the private key itself. Ethereum wallet signatures ("sign this message to prove you own this address"), Bitcoin transaction signatures, and SSH key authentication are all applications of this same core primitive, just with different key formats and signing algorithms (ECDSA/secp256k1 for most crypto wallets, Ed25519 increasingly common for SSH and Solana).
Confirming a message or transaction was really signed by a given key. Central to Decentralized.Host. Every assignment, observation, capability, bundle and audit checkpoint is an Ed25519 signature over canonical JSON with a domain-separated context, and 136 published conformance vectors let independent implementations check their verification.