Introducing Filosign

Six months ago, we started building Filosign, a document signing product where you control your files and your proof, not a vendor.

"But e-sign is a commodity. Why do we need another app?"

Because most e-signature tools tie your agreements to one company. They hold your documents, host your audit trail, and decide what happens if their servers go down or get breached. We wanted something different: encrypted documents, signing records anyone can verify, and optional payouts that never sit in our custody.

Two problems kept coming up:

• Only senders and recipients should be able to read the files.
• Proof of who signed what should survive Filosign's database and be checkable without trusting us.

Filosign addresses both with client-side encryption and on-chain attestations on Base:

• End-to-end encryption: Documents are encrypted in your browser. Only wallets you share with can decrypt them.
• Verifiable signing records: When someone signs, an attestation is relayed to FSEnvelopeRegistry on Base. Anyone with the compliance bundle and a public RPC node can verify it. No Filosign login required.

What you can do today

• Wallet-native identity: Sign with your own wallet, or sign up with Google or X and we provision an embedded wallet for you.
• Controlled permissions: Senders add you as a contact and wait for your approval before sending. No signing spam.
• End-to-end encryption: We only ever store ciphertext. Plaintext never touches our servers.
• Durable encrypted storage: Files live on private object storage and are archived to Filecoin via FilCDN so encrypted payloads stay available even if our hot storage fails.
• On-chain proof: Registration and signature events are written to FSEnvelopeRegistry. Tamper-evident, publicly auditable, independent of our database.
• No gas for you: We relay on-chain writes so you can use the product without holding ETH for fees.
• Proof packet: Export a PDF report with ceremony details and transaction hashes for legal or compliance review.

Here is what a Filosign proof packet looks like:

It records who sent the document, who signed, when they signed, and the on-chain transaction hash.

On legality: Filosign is designed around cryptographic identity, intent, and timestamps, the core building blocks frameworks like the ESIGN Act and eIDAS expect. We provide the evidence; you provide the intent.

Programmable settlement

The same architecture unlocks something traditional platforms cannot offer cleanly: attached payouts.

Senders attach rules via FSPaymentValidator. The payer approves funds from their wallet. When signing conditions are met, executePayout moves funds directly. Filosign never holds the money. Our server can relay the transaction for convenience; anyone can call it permissionlessly on-chain.

Examples:

• Cross-border payouts: A contractor signs a handover doc and receives payment in the same flow. No invoice chase or wire delay.
• Milestone grants: A funder releases payment when a signed milestone is recorded on-chain.

After six months of quiet building, Filosign is live on Base. Solo, Teams, and Teams Pro each include a 7-day free trial. Start from pricing or read the docs first.

Start a free trial →

Plan limits and feature details are in the Filosign docs.