Immutable.
Verifiable.
Forever.

Blockchain anchoring is the process of embedding a cryptographic hash of a document into a blockchain transaction. This creates an immutable, time-stamped proof that the document existed at a specific point in time. Because blockchains are append-only and cryptographically secured, the record can never be altered or deleted — providing permanent proof of existence.

No. Only the SHA-256 hash of your document is embedded on-chain. A hash is a one-way mathematical fingerprint — it proves the document existed without revealing its contents. Your actual document remains private and in your custody. The exception is the Sovereign tier, where Arweave stores the full document on a permanent decentralized network.

Each chain serves a different purpose: Polygon provides fast, low-cost anchoring with smart contract programmability. Bitcoin provides the highest level of security and immutability — backed by the world's largest computing network. Arweave provides permanent storage designed to last 200+ years. Together they create defense-in-depth: even if one network has issues, your proof remains on the others.

Indefinitely. Bitcoin and Polygon blockchains are designed to be permanent append-only ledgers. Arweave is engineered for 200+ year durability with its sustainable endowment model. As long as at least one node on any of these networks exists, your anchor can be verified. Even if all networks disappeared, the transaction data and verification instructions we provide allow you to prove the anchor independently.

Traditional timestamping services rely on a trusted third party — if that company goes out of business or their records are compromised, your proof is gone. Blockchain anchoring is trustless: the proof exists on a public, decentralized ledger that no single entity controls. You don't need to trust us, a government, or any corporation — you only need to trust mathematics and the blockchain network.

Any digital file: trust documents, wills, contracts, intellectual property filings, deeds, affidavits, certificates, creative works, and more. The anchoring process works identically regardless of file type because we hash the raw bytes. PDF, DOCX, TXT, images — all produce a unique SHA-256 fingerprint.

Verification is straightforward: (1) Re-hash your document using SHA-256. (2) Look up the blockchain transaction we provide using any public block explorer. (3) Confirm the hash in the transaction matches your re-computed hash. We provide step-by-step verification guides for each chain so anyone — including a court, auditor, or beneficiary — can independently verify the proof without any special software.

No. Each anchoring is a one-time fee. Once the transaction is confirmed on the blockchain, your proof is permanent — there's nothing to renew. We charge once to handle the anchoring process, pay the network fees, and provide your verification package. No recurring charges, ever.