FYI, the btc m4 14 label is most likely an old blockchain.com userdefined tag added through verified message signing nothing to do with Satoshi. These addresses show classic exchange transactional volume. Use tools like walletexplorer to check clustering and ownership patterns.
But what does "m4 14" itself represent?
Are these characters taken from an addresses for memorization purposes, or just a tag?
(toTo the web interface, not to any transaction itself, since blockchain.com was always just an explorer/wallet.