Blockchain-verified document signing with zero-custody privacy, AI-powered field placement, and comprehension gating. Connect your AI assistant through our live MCP server and manage agreements in plain English. Pay per document or go Enterprise.
Every document gets blockchain-verified proof of signing. Pick the mode that fits each workflow.
Documents are processed entirely in your browser. Nothing ever touches our servers — only a cryptographic hash reaches the blockchain.
Documents are encrypted and stored on our servers, unlocking AI features: automatic field placement, Proof of Understanding gating, and document intelligence.
Connect Claude, ChatGPT, Cursor, or any MCP-compatible AI tool. Seal documents, draft agreements, verify signatures, and manage workflows through conversation.
No downloads, no installs. Works in your browser.
Drag and drop any PDF. Choose zero-custody (browser-only) or encrypted cloud for AI features.
Place signature fields manually or let AI do it. Add Proof of Understanding or KYC requirements. Enter recipient emails.
Signers open the document in their browser. If PoU is enabled, they prove comprehension before signing. If KYC is required, they verify inline.
A cryptographic hash, signer wallet, comprehension score, and timestamp are anchored to the Pangea Protocol blockchain. Tamper-proof — forever.
Use them individually or together. Add Proof of Understanding or KYC verification to any signing workflow — per-use, no subscription required.
E-signatures with blockchain-verified proof. Choose zero-custody (browser-only) for maximum privacy, or encrypted cloud for AI-powered field placement. ESIGN & UETA compliant.
Verify the authenticity and integrity of any Blocksee-signed document. Anyone can check a signature's on-chain proof — no Blocksee account needed. Confirm the document hasn't been tampered with, who signed it, and when.
Connect Claude, ChatGPT, Cursor, or any MCP-compatible AI tool. Seal documents, create agreements, verify signatures — all in plain English.
See how Blocksee compares to incumbents.
No subscriptions, no tiers, no lock-in.
Blocksee runs as an MCP server, so your AI assistant can draft, send, and settle agreements directly — one call writes the contract, places the signatures, and emails every party. One document, one dollar, billed automatically from your balance. The signing platform built for the agent economy.
In zero-custody mode, your document is processed entirely in your browser — it never touches our servers. Only a cryptographic hash reaches the blockchain. In encrypted cloud mode, your document is encrypted and stored on our infrastructure, which enables AI-powered features like automatic field placement and Proof of Understanding comprehension gating. Both modes produce blockchain-verified signatures. You choose per document.
Proof of Understanding is our patent-pending comprehension verification system. You can add it to any signing workflow. AI analyzes your document's material terms, obligations, and risks, then generates questions specific to that document. Signers must answer correctly above a threshold you set before the signature field unlocks. The comprehension result is recorded on-chain as a privacy-preserving record — creating evidence of informed consent without revealing the specific questions or answers.
KYC is a per-use add-on you can enable within any signing workflow — no subscription required. When you activate it for a document, the signer completes identity verification (document upload + liveness check) inline without leaving Blocksee. A privacy-preserving credential links their verified identity to their PayPangea wallet. Blocksee never stores identity documents. Once verified, the signer's KYC status is reusable across the entire Pangea ecosystem.
Yes. Blocksee signatures comply with the U.S. ESIGN Act and UETA, which give electronic signatures the same legal weight as handwritten ones. The blockchain-anchored audit trail actually provides stronger evidence of signing than traditional e-signature platforms. When Proof of Understanding is enabled, it creates additional evidence of informed consent — particularly valuable in disputes over whether a signer understood the terms.
DocuSign always stores your documents on their servers — there's no option for zero-custody processing. They don't offer blockchain-verified signatures, Proof of Understanding, or inline KYC, and they lock you into a monthly subscription. Blocksee offers zero-custody as an option, blockchain-verified proof, open third-party verification, AI-powered comprehension gating, and simple pay-per-document pricing — $1 per document, no subscription, no lock-in.
No. A PayPangea wallet is created for you automatically behind the scenes when you first use Blocksee — you don't need to set anything up or know anything about blockchain. It works invisibly to anchor your signatures on-chain. If you complete KYC, that verification is linked to this wallet and reusable across the Pangea ecosystem.
Simple pay-as-you-go — no subscriptions, no tiers, no lock-in. Sending a document for signature is $1, which covers up to 4 signers, then $0.10 per additional signer, paid once and upfront by whoever creates it. Sealing a document on-chain so its authenticity can be verified is $0.20 per document, and verifying a document is always free for anyone. You top up a prepaid balance and only pay when you create. High-volume teams and agent platforms can get volume pricing, API/MCP integrations, and dedicated support on our Corporate plan — just contact us.
Upload a document and sign it in under 60 seconds. $1. No subscription. Add PoU or KYC when you need them.