[01]
Cryptographic, not photographic
Every signature emits a Solana memo with a SHA-256 hash of the document. The proof is the hash — no scanned signature image, no notary stamp graphic. The math is the receipt.
Features
Everything you need to sign — nothing you don't.
BlockSign is built around a single idea: a signature is just a hash, and a hash is just math. No notary graphics, no scanned wet ink, no wallets for signers — just cryptographic proof anyone can verify against the chain.
[02]
No accounts you can lose
Sign in with email and password. Signers don't need a wallet, an extension, or any blockchain knowledge — they just click the link in their inbox.
[03]
Verifiable by anyone, forever
Anyone can drop a signed PDF into the verifier and confirm it matches what's on chain. The transaction signature is embedded in the file itself.
[04]
Sub-second finality
Solana settles in under a second for fractions of a cent. NDAs, offer letters, MSAs — all faster and cheaper than a stamped envelope, with a real audit trail.
[05]
Multi-party & sequenced
Add as many signers as the document needs. Set ordering and deadlines. Each signature is its own on-chain commitment, so no party can tamper with another.
[06]
Audit trail by default
Every view, revision, and signature is appended to an on-chain log. Compliance teams stop chasing email threads — the document carries its own provenance.