Two things that I failed to understand:

1. You guys clear your inbox? Why? You use that email address both for personal and crypto so you need to keep them clean? It's personal preference though, so I can't comment further, just curious why bother cleaning your inbox.

2. Not even 1 tx proof, or screenshot or anything, left in your possession? Alltily indeed asked a deposit confirmation email, but the way I see it, that's not necessarily all 1,118 deposits. They just ask for an email showing that the address --a static, non-changing address that they dedicate for you-- is yours. One is enough.

If I may add a third one, is the PhoenixCoin platform has a fund history? Like a proof showing a token successfully mined or moved somewhere?

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As for HodlerCompany, would a screenshot of tx history from the sender side --suppose there is any-- sufficient? What about a signed message from the sender address like what ph4nt0m had tried? It's a valid ownership proofing method that's even acknowledged by this forum. If your aim is just to have a proof that some address is belonged to someone, I think thats a proof of ownership enough