Would this be enough for SoF on Kraken?

I’m thinking of selling a fairly large amount (around 80k USDT) through Kraken and transferring it to my bank. The funds are basically from a loan I gave a friend, and he repaid me in USDT. The flow was Coinbase → my self-custody wallet → Kraken. I’m a new Kraken user, so I’m wondering if screenshots from the block explorer + my wallet, along with a simple explanation that it was a private transaction, would be enough for SoF. I’d rather not bother my friend for extra proof if possible. I’ve heard that CEXs can be pretty strict, so I’d appreciate any advice.