AI · alternatives · 2026
24 alternatives to SPIF
Signed, tamper-evident provenance for AI outputs
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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sproof sign▲80Signing made easy and safe | 100% made for Europe
2021 · sign.sproof.com · its alternatives →
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To my knowledge, this is the first formally verified implementation of a 3D constructive solid geometry (CSG) operation: mesh intersection, implemented in Lean 4 and verified against a concise specification that pins down the surface of the resulting mesh exactly and guarantees practical well-formedness conditions on the triangulation. This project is also an experiment in avoiding having to trust AI-generated code. A human reviewer only needs to read 93 lines of formal specification and run the Lean checker to certify the correctness of the kernel, skipping the intricate 1000+ lines of…
Jul 2026 · github.com · its alternatives →
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Built this after watching engineering teams lose weeks before every SOC 2 audit rebuilding the same evidence trail from scratch — screenshots, PR links, spreadsheets — for work that was already documented in GitHub. EvidentTrail connects via GitHub App and captures PR approvals, branch protection changes, CI results, and AI-assisted commits as structured, tamper-evident evidence mapped to specific controls (SOC 2 CC8.1, ISO 27001 A.8.32, etc.). A few things that might be interesting to this crowd: - AI-assisted code detection: we identify co-authored-by trailers, bot authors, and PR labels…
Feb 2026 · evidenttrail.com · its alternatives →
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BlkSeal▲5Hi HN — I built an experimental demo that creates and verifies revocable digital signature artifacts using deep learning encoding models instead of traditional cryptographic keys. In this system, a specific model instance encodes file metadata into a signature artifact. That same model instance is required to verify it. Signing authority is controlled through a short-lived “lease” (15 minutes), and can be revoked to intentionally invalidate verification. This is not RSA/ECDSA, and I’m not making cryptographic claims or guarantees. I’m exploring whether the encoding method combined with…
Jul 2026 · lyfe.ninja · its alternatives →
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SealZero▲6Zero-knowledge proofs for authentic, privacy-safe images
Jan 2026 · sealzero.dev · its alternatives →
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ZK-powered vault for anonymous payouts and state snapshots.
Jan 2026 · its alternatives →
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We open-sourced the TLA+ and Fizzbee verified spec behind Ursa's storage engine. Verification across ~200K states caught a design bug that years of production missed. We then handed the spec to Claude Code — it produced a working Rust implementation (concurrent producers, compaction, fencing) without back-and-forth. We think verified specs are the best harness for coding agents: open-source the spec, let anyone implement it.
Apr 2026 · github.com · its alternatives →
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I built AI Trust Proof — an experiment in recording human good faith on-chain so it can be independently verified by people, software, or (eventually) AI systems. What it does (today) - Lets you sign a plain-English pledge and record its signature hash + metadata on Solana (devnet). - Mints a symbolic NFT badge pointing to that record. - Creates a verification page that shows the pledge, signature, and on-chain proof. What it’s not - No token, no airdrops, no yield. - Not a reputation score or KYC. - Currently just one signal: "Pledge signed." Why - If AI systems begin prioritizing who to…
2025 · aitrustproof.com · its alternatives →
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Tamper-proof audit trails for every AI agent
Jun 2026 · aif.predictai.ai · its alternatives →
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Instant digital signature verification & trust validation.
Mar 2026 · auditsignpro.com · its alternatives →
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Verify authenticity of handwritten signatures
2019 · sourceforge.net · its alternatives →
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Tamper-evident proof for document delivery & handoffs
Aug 2026 · prooftrail.tech · its alternatives →
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Stop your coding agent from guessing at datasheets
Jun 2026 · docs.byteask.ai · its alternatives →
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Auditable, provably-deletable memory for AI agents
Jul 2026 · github.com · its alternatives →
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WaveSign▲2Tamper-evident file authentication for images and PDFs
Mar 2026 · wave-sign.com · its alternatives →
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Scan, attest, and document EU AI Act compliance from your IDE. 247 obligations across 44 articles — code-verifiable, AI-assisted, and structured attestation in one workflow. Source-available (BSL 1.1).
Jun 2026 · compliancelint.dev · its alternatives →
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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 →