Key takeaways
- Coins held on a centralised exchange create two problems for a large sale: withdrawal limits that prevent delivery, and pooled deposit addresses that make ownership unprovable.
- A seller cannot sign a message from an exchange deposit address, so a screenshot of a balance is not evidence any buyer's compliance team will accept.
- The clean fix is to withdraw the full amount to self-custody before going to market; the practical fallback is to move a meaningful slice and settle the first tranches from there.
- Rule of thumb: if you cannot sign a message from the address holding the coins, you are not yet in a position to sell them in size.
A seller with coins on a centralised exchange has, from the buyer's point of view, two problems: they may not be able to deliver, and they cannot prove the assets are theirs.
The delivery problem
Exchange accounts carry withdrawal ceilings — per transaction, per day, and sometimes per rolling week. A block that clears in three tranches on paper becomes a fifteen-day drip in practice, with the price reference moving underneath it. Tier upgrades take time and are not guaranteed.
The ownership problem
Custodial deposit addresses belong to the exchange, not to the account holder, and they are frequently pooled. A seller cannot sign a message from that address, and a screenshot of an account balance is not evidence of anything a buyer's compliance team will accept. The buyer is being asked to take a stranger's word for the one fact that matters.
Two workable fixes
Move the inventory first
The clean answer is to withdraw the full amount to a wallet the seller controls — hardware, multi-sig, or a qualified custodian with a segregated address — before going to market. Withdrawal limits are then a problem solved once, in advance, rather than a problem the buyer inherits.
Prove control on a slice
Where a full move is impractical, transfer a meaningful slice — enough to cover the first several tranches — to a self-custodied address and settle from there. The seller signs from that address, the buyer verifies, and settlement runs against a wallet whose control is demonstrable. The remainder migrates in parallel while the first tranches execute.
The rule of thumb
If you cannot sign a message from the address holding the coins, you are not yet in a position to sell them in size. Solve custody before you solve counterparty.
Questions this answers
- Why do OTC buyers refuse coins held on an exchange?
- Because the deposit address belongs to the exchange, not the account holder, and is often pooled across users. The seller cannot sign from it, so the buyer is asked to take a stranger's word for the one fact that matters. Withdrawal ceilings then turn a three-tranche block into a two-week drip while the price reference moves.
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