If they can’t prove ownership by signing, and do this periodically, it’s safe to assume they own zero bitcoin.

GBTC, coinbase, binance, all of them. They all have zero until proven otherwise.

Show me the signed message…or it’s zero.

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The old trusty adage of "dont trust, verify". Always wise words to live by.

Also, get lightning setup for some zaps!

Actually it’s “trust, but verify”. And btw, it’s an old Russian proverb. Doveryai, no proveryai

Right. These proof of reserves are more proof of address. We want to see that they haven't lost the keys.

My entire retirement is locked in GBTC 😅

I’m sorry man. Maybe things will work out for the best somehow. Try to get some bitcoin in cold storage.

I have a a Hodl, just rolled my Roth IRA into GBTC

Ahh, your good then. I did the same thing. Rolled most of my retirement into GBTC and MSTR.

In the end, my hodl stack is the retirement plan.

Oh shit

I’m holding onto hope… still think GBTC would be the ultimate bear flag this cycle… but I agree they should f’ing sign & verify already 😩

Bitcoin signed messages don't prove ownership

Are you referring to signing a message with the key for an address that only temporarily has the correct balance?

Addresses don't have balances at all

Haha ok true. I don’t mean that in the ETH sense. I mean that UTXOs have been sent to an address that is related to a private key, which has signed a message, and not thereafter moved. That’s possible to check, right?

No, because that UTXO isn't necessarily theirs anymore

How so since in the hypothetical we’ve already checked that it hasn’t been spent? Maybe.. if they have signed a transaction and broadcasted it but it has yet to make it into a block?

Or if they transferred it off chain

Can you elaborate? Don't you have to own the private keys to sign a message?

No. Custodial wallets are supposed to let you sign messages for your addresses, and UTXOs don't necessarily need to move when you transfer the bitcoins to someone else.