No login to a wallet or blockchain, no trust in us required. Priormark is just the glue. The Hedera Mirror Node API and HashScan are public infrastructure operated independently of this platform by the Hedera Foundation and Hedera Council consisting of 34 global companies.

Blockchain is the familiar term. Hedera is the better technology — a carbon-negative public distributed ledger, powered by hashgraph consensus. When you submit, a message containing your content fingerprint is written to a Hedera topic. The network's nodes reach consensus on the exact time, establishing your timestamp permanently and without any involvement from PriorMark. That timestamp is your legally defensible proof of prior possession. That network is governed not by a company, but by a global council of independent organizations.

Hedera Governing Council

These organizations govern Hedera's network protocol — not its content. Only a SHA-3/512 fingerprint of your idea ever touches the ledger; the actual content never does. Council members have no visibility into what was submitted or by whom.

Quantum: HCS uses the ED25519 signature scheme — more quantum-resistant than RSA or ECDSA used by most blockchains. Hedera monitors NIST's post-quantum standards and has a protocol-level migration path that would not require re-submission of existing claims.

SHA-3 is the current NIST standard hash function, standardized in 2015. The 512-bit variant provides stronger collision resistance and greater margin against future cryptanalysis than the more common 256-bit variant.

Why not SHA-256? SHA-256 (used by Bitcoin) is based on the Merkle–Damgård construction. SHA-3 uses a different sponge construction — any vulnerability discovered in SHA-2 would not affect SHA-3. For long-lived records, this independence matters.

Quantum: Grover's algorithm theoretically halves the effective bit strength of a hash function on a quantum computer — reducing SHA-3/512 to ~256-bit effective security. 256-bit remains computationally infeasible even with large-scale quantum hardware.

GCM (Galois/Counter Mode) adds authentication: each encrypted payload carries a 128-bit authentication tag. If anyone modifies the encrypted data in storage, decryption fails — silent corruption is not possible.

Each encryption uses a randomly generated 96-bit initialization vector (IV), so encrypting the same content twice produces completely different ciphertext — preventing pattern analysis across files.

Quantum: Grover's algorithm reduces AES-256's effective key strength to ~128-bit. 128-bit remains secure for the foreseeable future. We monitor NIST's post-quantum standards (ML-KEM) for a future migration path.

AWS S3 stores objects redundantly across multiple Availability Zones within a region — a single hardware failure, or even an entire data center outage, cannot result in data loss. Access is controlled by AWS IAM policies; files are not publicly addressable.

Important: your proof of claim lives on the Hedera ledger as a SHA-3/512 hash. That record is permanent and independent of cloud storage. Your claim timestamp and content fingerprint remain on Hedera — verifiable forever with only your original files and a HashScan link.

Ledger (HCS): ED25519 signatures — more quantum-resistant than RSA or ECDSA. Hedera has a protocol-level migration path to NIST post-quantum standards (ML-DSA, SLH-DSA) without requiring re-submission of existing claims.

Hash (SHA-3/512): Grover's algorithm halves effective hash strength — reducing SHA-3/512 to ~256-bit effective security. 256-bit is computationally infeasible to break even with large-scale quantum hardware.

Encryption (AES-256-GCM): Reduced to ~128-bit effective security under Grover's algorithm. 128-bit remains secure for the foreseeable future. We monitor NIST's ML-KEM standard for a future migration path.

NIST finalized its first post-quantum cryptography standards in 2024. We treat quantum migration as a planned evolution, not an emergency — and the architecture is designed to accommodate it without invalidating existing claims.