Certify your texts, ideas and files with a Bitcoin blockchain timestamp
Fill-level tax recomputation for Hyperliquid traders
Stage
Not given
Startup
Founded
Not given
2026
Based in
ES
Not given
Pricing model
Freemium
Freemium
Pricing
Free plan: €0, includes unlimited Bitcoin certification, shareable proof links, REST API, and 3 web page captures per day. Pro plan: €4.90/month, adds RFC 3161 timestamping, eIDAS qualified certificates, official PDF certificates, 20 web page captures per day, and identity verification.
Free tax check available; full reports priced by fill count, paid in USDC on Arbitrum, Base or Ethereum. Reports start from $29.
Key features
Bitcoin anchoring via OpenTimestamps protocol
SHA-256 fingerprint computed locally in browser
REST API for integration and automation
RFC 3161 qualified timestamps for European legal recognition
eIDAS-qualified PDF certificates from Sectigo
Web page capture and archiving
Optional identity verification via Stripe Identity
Webhook notifications for proof confirmation
Independent verification via opentimestamps.org
AES-256-GCM encryption for Pro stored content
Fill-by-fill recomputation of realized PnL, funding events, and signed fees
Full trading history reconstruction from independent chain indexer
Two-axis independent verification system
Sub-account and linked wallet support
Reconciliation against venue's official curve with measured disagreement disclosure
Cost basis calculation with FIFO and weighted average methods
Exchange-carried basis import from Kraken and Coinbase
Public data analysis with no sign-up or key upload
What makes it different
No trusted third party required—proofs remain verifiable forever without Proxae
Original content never leaves your device—only cryptographic fingerprint is transmitted
Mathematically immutable—proof dates cannot be modified without invalidating Bitcoin blockchain
Reconstructs complete trading history from chain data, not limited to venue API's ~30-hour window
Prints venue data disagreements rather than hiding them
Every number is re-derivable and reproducible from public venue data
Handles complex account types other tools miss or miscalculate
Proxae
Basisproof