Now you see by yourself that memo works strangely - now they are confirmed.

But the best way is to check directly in blockchain. For example, you can compare my profile here and in blockchain:
https://memo.sv/profile/15ZhFcgZNNVU8S7bawDk83K7L8cjXCWqxc
https://whatsonchain.com/address/15ZhFcgZNNVU8S7bawDk83K7L8cjXCWqxc

---

All methods summary:

1) memo.sv
Frontend looks good, but backend works unclear.

2) BSV directly via filepay script
Works clear, but BSV itself is not very stable.

3) member.cash
BCH is active and stable, but member.cash is not very convenient.

4) myetherwallet ETC
Easy and cheap, but ETC is scandalous project and it's future is unclear.

5) Cardano metadata
I know nothing about Cardano, but at least it is number 4 in the most valuable currencies - https://coinmarketcap.com/ - worth to try.

6) myetherwallet ETH
Expensive, but more reliable than all above.

7) BTC
see https://member.cash/index.html#thread?root=c7e03403575423d07ccf1101ce61e7be2128ceb98e4de96b8a423d007ab40eac
or the same https://memo.cash/post/c7e03403575423d07ccf1101ce61e7be2128ceb98e4de96b8a423d007ab40eac
BTC BLOCKCHAIN IS THE MOST RELIABLE STORAGE EVER, but you need to be familiar with Linux in order to run the script.