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Keep the file. Keep the proof. - Proofstamp
ProofStamp adds independent time evidence to an important file, so you can verify the exact record you kept later.
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82 % |
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AttestLog | Digital Provenance, File Integrity, and Transparency Log Proofs
AttestLog generates browser-local file hashes, portable provenance manifests, append-only transparency log records, and public proof URLs without uploading f...
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81 % |
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Private document timestamp and proof of existence
Create a private document timestamp and proof of existence for any file without uploading the original document. Hash locally, keep the certificate, and veri...
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81 % |
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ProofLedger: Proof of Existence API on Polygon
Proof of existence as an API: send a hash, get a Polygon-anchored certificate anyone can verify without us. 100 API proofs a month free, no card.
|
80 % |
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Provelio — Zero-Knowledge IP Timestamping
Prove file existence without uploading. SHA-256 hashing, RFC 3161 timestamps, and blockchain anchoring. For creators, institutions, businesses, and developers.
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80 % |
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Svartnod Timestamp
Create an independent digital timestamp without uploading the original file.
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79 % |
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Securaw | Stamp & Verify
Stamp a file, download its proof, and later verify that any copy still matches the originally certified file.
|
78 % |
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Document integrity proofs · DocuChain Live
Create privacy-first, tamper-evident document proofs without uploading your document.
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78 % |
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Private Notary — Prove it existed. Without revealing it.
Create independently verifiable cryptographic proof that your file existed — without uploading it. Evidence is timestamped on the Solana blockchain. €4.50 on...
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78 % |
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nStamp | Public timestamps for file hashes
Create a public, time-bound commitment to a file hash. nStamp calculates SHA-256 locally and anchors only the fingerprint on NEAR.
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78 % |
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proofbundle · Upcoming plugins for Claude Code and Codex
Upcoming proofbundle plugins for Claude Code and Codex. Verify receipts, document reviews and use evidence to inform approval decisions.
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78 % |
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SoulProp | Your work is a part of who you are
Your work is a part of who you are. Don't leave it unprotected. Encrypted cloud storage with cryptographic timestamps and court-ready evidence.
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77 % |
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Untamperable | Private files. Public proof.
Untamperable creates verification receipts for important digital artefacts without uploading or storing the original file.
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77 % |
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DataMirror — Immutable Proof on Solana
Immutable proof of file integrity on Solana blockchain. Verify file authenticity with cryptographic hashing. Your data never leaves your device. Zero-knowled...
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77 % |
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Sanifile — Disarm any file before you open or share it
Strip macros, scripts, formula injection, and EXIF metadata from PDF, Office, CSV, and image files. No account required. Evidence log included.
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77 % |
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File Type Detector: Check File Type Online Free Fast Private
Free online tool to check file type and formats detect. Analyze file types instantly with 100% privacy - all processing happens in your browser, no uploads.
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77 % |
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Proofmarks — Lock Any Document in Time
Get a tamper-proof certificate for any file in seconds. Permanently recorded. Verifiable by anyone. No technical experience required.
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77 % |
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XSeal: Cryptographic Document Sealing & Tamper-Evidence
Seal any file with XSeal to get a timestamped SHA-256 hash and a signed certificate, then prove later that it is byte-for-byte unchanged, or was altered.
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76 % |
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Chronostamp — Proof of existence on Solana
Prove that your file existed at a specific date by anchoring its hash on the Solana blockchain.
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76 % |
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Nexus • Proof of Integrity
|
76 % |
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