Hedger

Instant, verifiable document proofs on Hedera

Upload any file → pay HBAR → get an immutable hash on Hedera File Service and a 1-of-1 NFT as the proof marker.
No central trust, no waiting, live on-chain.

Notarize a Document

SHA-256:
HFS File:
HTS Token:
AI Summary 

        

      

    


    
    

      
Verify a Document

      
      

      

        
SHA-256: 

        
Status: 

        
HFS File:
          
        

        
HTS Token:
          
        

        
Attestations
          
    
        
    
      
    
    
    

    
    
    
      
    Live Stream (SSE + HCS)
    
      
    
    
  
    

  
  
    
    
    How it Works
    
    
      
      
    1. Hash locally. File never leaves your browser un-hashed.
      2. 
      
    2. Duplicate pre-check. Skip payment if we’ve seen that hash before.
      3. 
      
    3. Pay once. 0.5 HBAR to the treasury via MetaMask on Hedera Testnet.
      4. 
      
    4. Server verifies txn then stores metadata on Hedera File Service.
      5. 
      
    5. 1-of-1 NFT minted. Acts as a simple on-chain proof object.
      6. 
      
    6. Agent attests. An off-chain agent extracts key fields and
          posts a signed attestation back to HFS & HCS.
      7. 
    
    
  
    

  
  
    
    
    Why Hedera
    
    
    
      Predictable fees ◆ $0.001-level
      Sub-3 s finality
      File Service = immutable blobs
      HTS native NFTs
      JSON-RPC (Hashio) → MetaMask
    
    
  
    

  
  
    
    
    FAQ
    
    
    What exactly is stored on-chain?
      
    Only the SHA-256 hash, filename, AI summary, and deterministic
         fields (amounts/dates/IBANs). The file itself never leaves your
         machine.
    
    
    
    
    Is the NFT transferable?
      
    Yes. It’s a standard HTS NFT. Transfer it to prove ownership of the
         document hash.
    
    
    
    
    Can I notarize images or DOCX?
      
    Yes. We hash any binary. Text extraction / summary works best on
         PDFs right now.
    
    
    
    
    What happens if I upload the same file twice?
      
    The client detects the duplicate and skips payment.
         The server confirms and returns the existing proof immediately.