Commerce · alternatives · 2026
24 alternatives to SasaSavic Quantum Shield™
Quantum-secure timestamping for verifiable digital proofs
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1FQ
SasaSavic.ca recently launched a public cryptographic timestamping service designed to remain verifiable even in a post-quantum world. The platform uses SasaSavic Quantum Shield™, a dual-signature protocol combining classical and post-quantum security. Each submitted SHA-256 hash is: • Dual-signed with ECDSA P-256 and ML-DSA-65 (per NIST FIPS 204) • Anchored to the Bitcoin blockchain via OpenTimestamps • Recorded in a public, verifiable daily ledger API (beta, no auth required): https://sasasavic.ca/beta-api/ Example curl request: curl -X POST…
Nov 2025 · its alternatives →
- 2
Neptune is a quantum-safe layer 1 blockchain combining zk-STARKs and PoW consensus. Private by default, programmable, and built for global scale
2014 · neptune.io · its alternatives →
- 3
TimeSeal▲116Restoring digital trust, one blockchain timestamp at a time
2023 · timeseal.com · its alternatives →
- 4BT
Find information, resources and relevant links for btproof.com. This domain may be for sale.
2013 · btproof.com · its alternatives →
- 5
- 6
Get free email forwarding for custom domains. Send & receive as [email protected] with unlimited aliases, 10GB storage, IMAP/POP3/SMTP & 100% open-source security. Trusted by 500K+ users. Setup in 2 minutes.
2023 · forwardemail.net · its alternatives →
- 7
Claimby▲107Free legally-valid timestamps for your files, ideas & art.
2018 · claimby.com · its alternatives →
- 8SV
2022 · docs.planet.ink · its alternatives →
- 9
Pitch, Idea, Discussion, Help, Launch, Crypto, Startup
2025 · github.com · its alternatives →
- 10
2023 · codeberg.org · its alternatives →
- 11
Qpher▲4Post-quantum encryption & signing — drop-in REST APIs
Jun 2026 · qpher.ai · its alternatives →
- 12
Post - Quantum Blockchain (ML-DSA-65)
Jul 2026 · quantum-lattice.futuristicai.co.za · its alternatives →
- 13
Prove that you said things before anyone else
Jun 2026 · yousaidthat.org · its alternatives →
- 14
quantum resistance cryptography or timeless E2E encryption
2022 · accounts.google.com · its alternatives →
- 15
Access Vault▲21Post-Quantum Credential Management Made Easy
2025 · accessvault.app · its alternatives →
- 16TP
Hi HN, we are the developers from Tuta (formerly Tutanota), the German end-to-end encrypted email provider, and we recently released the world's first post-quantum encryption for email. We have included a full technical write-up of the cryptography involved in these changes and we have released it for open public review. This document specifies TutaCrypt, a protocol designed for hybrid email encryption in Tuta Mail. The protocol combines a classical Elliptic-Curve-Diffie-Hellman key exchange with a post-quantum KEM. The goal is to replace the usage of RSA in Tuta Mail. In the remainder of…
2024 · tuta.com · its alternatives →
- 17
Zero-knowledge cloud storage, post-quantum by default
Jun 2026 · shieldfive.com · its alternatives →
- 18
- 19
CryptoProof ran from 2018 to 2021, as a free timestamping service on Ethereum.
2018 · cryptoproof.org · its alternatives →
- 20
Go Quantum-Safe Before Quantum Goes Live
2025 · qu-secure.net · its alternatives →
- 21IM
I've just launched a new site that creates Trusted Timestamps. Anyone can use it to make any data immutable going forward in time. By "verifying" a Trusted Timestamp against a file, you certify that file has not been altered since the time the Trusted Timestamp was created at. Trusted Timestamps are not a new idea, there is a standard defined in RFC3161 and some other prior work as well. My design though is different as it is based on plain-text, human readable files. I believe this makes this form of Trusted Timestamp more accessible for a wider set of applications. I found the RFC3161…
2024 · timestampit.com · its alternatives →
- 22
FIPSign▲1Post-quantum signing API · ML-DSA-65 (NIST FIPS 204)
May 2026 · fipsign.dev · its alternatives →
- 23
- 24EE
Hi HN, we have recently completed a research project on how to encrypt emails with post-quantum secure algorithms as well as Forward Secrecy. We'd love to hear your feedback and discuss technical issues. The paper can be found here: https://eprint.iacr.org/2021/875
2021 · its alternatives →
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- Free Quantum-Resistant Timestamping API (Dual-Signature and Bitcoin) alternatives
- Neptune.io, A self-healing platform to fix server alerts automatically alternatives
- TimeSeal alternatives
- btproof - trusted timestamping on the Bitcoin blockchain alternatives
- QU3 alternatives
- Forward Email – Open-Source Quantum Safe Encrypted Email Service alternatives
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →