Private key
—CRYPTOGRAPHIC ORACLE FOR BYTES, RANDOMNESS & ADDRESSES
Numbers become
addresses.
COBRA is a free, open-source Bitcoin cryptography playground for generating randomness and understanding how private keys become public addresses.
Built from the Bitcoin Address Generator research repository · by ol-s-cloud
Local-first secretssecp256k1ECDSASHA-256RIPEMD-160Base58CheckOpen source
THE DESERT / MARS TEST
If you were stranded in a desert — or on another planet — Bitcoin would not need to issue you an account.
In principle, a valid secret number plus the Bitcoin derivation rules is enough to reconstruct its corresponding address. Human-created “random” numbers are not secure enough for real funds, however. COBRA demonstrates the mathematics; secure wallet software uses cryptographically strong entropy.
ORACLE 01
Cryptographic random generator
Create integers, hexadecimal strings, raw bytes and UUIDs from your browser's cryptographically secure random source.
OUTPUT
Click “Generate random value”.
ORACLE 02
Bitcoin address generator
Generate a fresh 256-bit private key locally or supply a valid hexadecimal key and inspect every stage of legacy P2PKH derivation.
Live engine: Browser JavaScript. The original Python methodology remains preserved in the repository and notebook; COBRA does not send your private key to a Python server.
Compressed public key
—HASH160
—WIF · compressed mainnet
—Legacy P2PKH address
—The private key/WIF is the controlling secret. COBRA does not upload or retain it. Anyone who obtains it can potentially spend funds controlled by the corresponding address.
THE METHOD
Private key → public key → hash → address.
COBRA follows the original project methodology: valid 256-bit scalar → secp256k1 public key → SHA-256 → RIPEMD-160 → Bitcoin mainnet version byte → double-SHA-256 checksum → Base58Check address.
The current browser engine reimplements that method in JavaScript. The original Python implementation and historical Colab notebook remain separate and preserved as the project's research provenance.
RESEARCH TERMINAL
The code, curve and derivation chain behind COBRA.
These visuals and references come from the original Bitcoin Address Generator repository. The web product exposes the underlying cryptographic method rather than hiding it behind a single button.
$ pip install bitcoin-address-generator
from bitcoin_address_generator import generate_wallet
private_key, public_key, address = generate_wallet()
print(f"Bitcoin Address: {address}")
# methodology
entropy → private key
private key × secp256k1 generator point → public key
SHA-256 → RIPEMD-160 → version byte
→ double-SHA-256 checksum → Base58Check → P2PKH addressELLIPTIC CURVE CORE
secp256k1
The private key is a scalar. The corresponding public key is produced by elliptic-curve scalar multiplication on secp256k1 — the curve used by Bitcoin.
y² = x³ + 7 mod p
Public key = private scalar × generator point G
ECDSA METHOD
ADDRESS ARCHITECTURE
TWO IMPLEMENTATIONS, ONE METHOD
Browser engine
Runs locally in JavaScript using the browser cryptographic RNG and pinned cryptographic libraries. Private keys do not need to leave the device.
Python research lineage
The repository's Python package and 2023 notebook demonstrate the same address-construction chain using Python, ECDSA, hashlib and Base58.
Open original notebook ↗WHERE DOES THE ADDRESS GO?
Nowhere. Until someone pays it.
Generating an address does not register an account with COBRA or Bitcoin. If bitcoin is later sent to it, the transaction/output becomes visible on the Bitcoin network. Control comes from the corresponding private key.
Keep the secret
The private key — often represented as WIF for import — enables spending.
Recover with compatible wallet software
A compatible wallet can import or sweep the private key/WIF and discover spendable outputs associated with it.
Lose the key, lose control
COBRA intentionally stores no recovery copy. There is no COBRA password reset for a standalone Bitcoin private key.
YOUR COBRA GENERATION LOG
Public addresses. Private secrets stay private.
This browser keeps a local log of addresses generated on this device. Every record links directly to the corresponding Bitcoin address on Blockchain.com Explorer. Private keys and WIFs are never placed in the log.
Generate a Bitcoin address to begin your local activity log.
Next layer: a true cross-user COBRA live feed requires a small persistent backend. That future registry should remain opt-in and store only public addresses, timestamps and derivation metadata — never private keys.
ORIGINAL RESEARCH · 2023
Built on the original notebook.
The project originated during postgraduate study in Finance & Data Analytics as an exploration of blockchain technologies, cryptographic keys and Bitcoin address construction. The historical notebook remains untouched in the repository; COBRA does not imply university endorsement or custody of user funds.
COBRA by ol-s-cloud · modern web interface built directly on the original Bitcoin Address Generator repository.
TECHNICAL & ACADEMIC REFERENCES
Built on documented cryptography.
Bitcoin Address Technical BackgroundVersion 1 address construction and Base58Check.ECDSA / Bitcoin WikiElliptic-curve signature methodology used in Bitcoin.SEC 2: Elliptic Curve ParametersRecommended domain parameters, including secp256k1.ECDSA Python LibraryPython elliptic-curve implementation used by the original codebase.ECDSA SurveyAcademic survey of ECDSA algorithms and applications.Bitcoin Developer GuidePrivate keys and wallet architecture.Bitcoin Transaction ReferenceP2PKH and address conversion.Blockchain.com ExplorerPublic Bitcoin address verification used by COBRA.
BUILD WITH COBRA
Building something brilliant on Bitcoin?
The free web tools remain open. Developers, researchers and teams can reach out to discuss future COBRA API/SDK access, licensed integrations, cryptographic utilities or ways COBRA can contribute to your project.
The API is not publicly launched yet. That is intentional: access, rate limits, licensing and safe handling of cryptographic operations should be designed before opening it broadly.
OPEN SOURCE · BY OL-S-CLOUD
Learn from it. Fork it. Improve it.
COBRA is an open-source evolution of the original Bitcoin Address Generator repository. The source, methodology, notebook history and contributions remain visible on GitHub.