Tangem Wallet Pack of 2 - Secure Crypto Wallet - Trusted Cold Storage for Bitcoin, Ethereum, NFT's &

Tangem Wallet Pack of 2 - Secure Crypto Wallet - Trusted Cold Storage for Bitcoin, Ethereum, NFT's &
Key item features Ultimate Security: Generates a private key that remains on the card, safeguarding crypto and NFTs from hackers with EAL6+ certification and audited firmware. Versatile Compatibility: Manages over 13,000 tokens across 70+ blockchains, supporting DeFi, NFTs, and DeEx without wires, Bluetooth, or USB. Effortless Operation: Utilizes NFC for secure transactions via a mobile device and the Tangem app, enabling buying and selling crypto with various payment methods. Smart Backup: Features a second Tangem Wallet as a backup, eliminating the need for paper, pictures, or seed phrases for recovery. Durable Design: Boasts IP68 protection against environmental conditions, ensuring longevity and robust physical security. Comprehensive Support: Compatible with Bitcoin, Ethereum, Solana, XRP, USDT, and over 6,000 cryptocurrencies, integrating with dApps and WalletConnect.

LBANK

LBANK

P2PKH adresses containing sentences

I would like to know more about sentences that can exist in P2PKH adresses and how to find them.

For instance in the case of the bitcoin puzzle 66 that was stolen by someone's bot [1], the stealer wrote a message by sending some dust to adresses like 1WhatWereUThinking6666666662wkqq1

He doesn't control these addresses, but still they exist.

Q1) how were they found? It seems he started from 1WhatWereUThinking666666666666666 and gradually changed the last few digits in an algorithm until hitting a valid address: is there really a function isValidBitcoinAdress which returns true/false somewhere?

Q2) in any case, how was he sure that it would be found quickly? I.e. couldn't it be the case that among all addresses the most similar is an incomplete target like 1WhatWereUThi123456666666662wkqq1?

References

[1] Bitcoin Puzzle 66: Is this unconfirmed transaction archived anywhere?



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