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after block 1657200 i can sell my spr? or have i wait for the airdrop? my coins are on cryptopia

If you really want to, yes. Why not keep them? I plan to. Spreadcoin has a great future.

EXCHANGE

We are expecting Cryptopia to capture how many Spreadcoins everyone has on their exchange at this block height.

We will wait a few days before doing the actual snapshot download. Once we have a database of who owned what at block height 1657200, done some checks, we can begin thinking about the launch process.

When the Helium chain is launched, we will generate enough coins at the start to give everyone at block height 1657200 the same number of Helium coins as they had on Spreadcoin.

Cryptopia will tell us the total of all the account balances they have (not who you are individually) and after an audit, we will give them the number of Helium coins that match how many Spreadcoins they had on their books at the time of the snapshot block height.

Once we send them all the Helium coins they have asked for, they will distribute them to all your accounts - 'Airdrop'.

MANUAL

If you are in control of your Spreadcoins (off exchange and on a public key where you have the actual private key), then you can start to make a claim for your Helium coins.

This will take a real long time as we'll be busy with the launch process, making sure the network is stable, dealing with MN set-up questions, dealing with people attacking the network, dealing with new pool operators, dealing with new exchange discussions, starting off potential pilots, working on a patent application, flying off to have technical meetings about the Service Node network, etc, the list goes on and on (just setting some expectations on timing of 'rush jobs' people will be asking for).

HOW LONG TO WAIT BEFORE MOVING COINS?

How long do you have to wait before moving your coins around? That is a difficult question to answer. I personally am going to allow a minimum of 60 to 120 blocks (about 1 to 2 hrs). Take a look at discussions around the Bitcoin Cash fork and you'll see a range of discussions on this question. The variety of answers apply to us too. Some will say you should wait days, some a few hours.

You could take your chances and move coins after just a few blocks, but why take the risk?