I understand that you are suspicious, but my partner is a reputable mining institution based in Shenzhen, their crypto wallets contain more than 13,000 bitcoins.
Then tell your partner to sign an address (of many) with at least 2000
BTC. The only way to verify your words.
To answer your question about the maximum amount, in the early stage, Bitcoin can be sent to the counterparty first. However, during on-platform transactions, Bitcoin's transfer speed is inherently slow.
On which platform are you referring to?

For later stages, we can switch to having USDT (or 'U') sent first to the escrow wallet to accelerate the process. For small amounts, we may continue using Bitcoin-first transfers, albeit slowly.
So, with USDT, the process for moving large amounts is faster than BTC? Can you explain it to me, because I'm a bit lost...

Yes, that’s correct, BTC transactions go through the Bitcoin blockchain, which requires confirmations from miners. That usually takes anywhere from 10 minutes up to an hour, depending on network congestion and fee levels. For large transfers, that delay can be a hassle — and sometimes a risk — in OTC deals.
USDT, on the other hand, runs on faster networks like TRC20 (Tron) or ERC20 (Ethereum).
USDT-TRC20 is super fast (a few seconds) and has very low fees.
USDT-ERC20 is a bit slower and more expensive, but still faster than BTC.
That’s why, in later stages of the transaction, we suggest sending USDT to the escrow wallet first — it speeds things up and makes the process smoother.
For small amounts, we can still go BTC first if needed, just with slower timing.