COBRA
Documentation

Use COBRA.
Know the boundary.

Create cryptographic randomness, derive Bitcoin addresses, work from the command line and prepare an offline COBRA environment.

Start here

Capability status

Status labels describe the maturity of a feature, not its visual completeness.

Status Meaning Current COBRA surfaces
Available Works on the public site now. Browser randomness, legacy P2PKH address derivation and the live Bitcoin Explorer with a device-local address log.
Experimental Implemented for controlled testing, not material funds. Python CLI and the limited Offline Lab.
Research Published inquiry, evidence and open questions. Privacy, post-quantum migration, resilient signing and the preservation of digital value.
Available

Browser tools

Create cryptographic randomness

  1. Open Home → Create Randomness.
  2. Choose an integer, hexadecimal string, byte sequence or UUID.
  3. Set the requested length or numeric range.
  4. Select Create random value.

The browser uses crypto.getRandomValues. Human-chosen numbers are not a safe substitute for cryptographic entropy.

Derive a legacy Bitcoin address

  1. Open Home → Bitcoin Address Lab.
  2. Create a fresh address example, reuse the last 32-byte hexadecimal value, or enter a valid 64-character private key.
  3. Review the compressed public key, HASH160, WIF and legacy P2PKH address.
  4. Copy only the public address when sharing or checking it in a block explorer.
Keep secret: private key, WIF and recovery kit. Anyone who obtains these values may control funds associated with the address.

Address derivation

entropy → private key → secp256k1 public key → SHA-256 → RIPEMD-160 → version byte → double-SHA-256 checksum → Base58Check → P2PKH address
Experimental

Command line

Use the CLI for local development and testnet-first experiments. Install from the source repository until a separately verified package release is published. 

python -m venv .venv
source .venv/bin/activate
pip install git+https://github.com/ol-s-cloud/bitcoin-address-generator.git

cobra status
cobra random --bytes 32
cobra generate
cobra validate <address> --network testnet

Private keys are hidden by default. See the CLI guide for explicit secret-output commands, network selection and current limitations.

Experimental

Offline Lab

The current Offline Lab creates a 256-bit random value using the browser cryptographic API. It does not yet include a fully packaged, dependency-free Bitcoin derivation or signing engine.

  1. Save a complete, verified COBRA offline release on the target machine.
  2. Disconnect the machine before creating secret material.
  3. Keep secrets on the offline machine; move only public addresses or verified transaction data across the boundary.

Open the Offline Lab →

Available

Explorer

COBRA Explorer shows live Bitcoin mainnet price, market, block, transaction and hash-rate data alongside addresses created on the current device.

Open COBRA Explorer →

Required practice

Security boundary

  • Do not use demonstration keys for material funds.
  • Never paste a private key, seed phrase or WIF into chat, support messages, analytics, issue trackers or remote forms.
  • Confirm the Bitcoin network and address type before importing or sweeping a key.
  • Treat browser extensions, clipboard managers, screen recording, shell history and removable media as possible exposure paths.
  • Use independently reviewed wallet software or hardware for real-world custody.

Read the repository security policy ↗ before experimenting with key material.

Security note. Keep private keys, WIFs and recovery material away from shared systems, messages and analytics.