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Off-Chain Utilities
Cryptographic tools that run entirely in your browser. Your keys never leave your device.
Sign
Verify
Encrypt
Decrypt
Hash
0.000 CBT
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Sign text with your private key to prove control over your address.
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- Sign exact text. Any whitespace change breaks verification.
- Never sign messages you do not understand.
- Share the signature, not your private key.
Confirm that a message was signed by a specific address.
Verification result will appear here
- Verification requires: original message, signature, and signer public key.
- If verification fails, check for hidden characters or encoding changes.
- Valid signatures prove the signer controls the private key.
Only the recipient's private key can decrypt.
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- Use the recipient's latest public key.
- Only the holder of the recipient's private key can decrypt.
- Encryption uses ECIES for secure end-to-end communication.
Decrypt a message that was encrypted for your public key.
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- Only the holder of the correct private key can decrypt.
- Your private key never leaves your browser.
Generate SHA-256 hash of text or data.
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- SHA-256 always produces a 64-character hex string.
- Even a tiny change in input produces a completely different hash.
- Hashing is one-way — you cannot recover the original data from a hash.