BitMEX Research sounded an alarm on 8 July after spotting what it calls “an ongoing Bitcoin scam.” In a X post the analytics desk described a wave of tiny “dust” transactions sent to pre-2012 Bitcoin addresses that still contain large, untouched balances. Each transaction carries an OP_RETURN message that reads: “NOTICE TO OWNER: see salomonbros[.]com/owner_notice.” One of the targets is the famous 1Feex wallet holding almost 80,000 BTC stolen from Mt. Gox in March 2011—funds now worth roughly $8.6 billion.
The link embedded in the OP_RETURN string resolves to a slick website branded “Salomon Brothers,” complete with an “advisory board” of genuine 1980s bond-trading luminaries. The site claims to have taken “constructive possession” of the dormant wallets and gives any “bona fide owner” ninety days—until 5 October 2025—to prove ownership or forfeit all rights. Proof, it says, can be provided either by signing an on-chain transaction or by submitting personal information through a web form.
The scam coincides with a burst of coordinated activity uncovered by blockchain sleuths. On 4 July—a US holiday that saw record-breaking on-chain movement—80,000 BTC were transferred out of eight decade-old wallets within minutes of each other, each wallet having first received a trio of OP_RETURN messages culminating in the “Salomon Brothers” notice.
Researchers believe the scammers are exploiting OP_RETURN because the opcode lets them “graffiti” arbitrary text onto the blockchain without spending significant funds, guaranteeing that any future owner—or curious on-chain watcher—will see the notice.
BitMEX’s advice is blunt: “Do NOT fill in this form.” Anyone holding coins in an address that receives one of these messages can prove control safely by moving funds to a fresh wallet; anyone without the private key has nothing to gain and much to lose by responding. Law-enforcement agencies have been notified, but no jurisdiction has yet announced an investigation.
For now, the safest course is to treat any unsolicited legal notice broadcast via the blockchain with extreme skepticism. In Bitcoin, possession of the private key remains the only proof of ownership that matters—no matter what an OP_RETURN string or a glossy website might say.
At press time, BTC traded at $108,811.
