user37352: In a multi-sig transaction, if one party refuses to sign, what happens to coins?  Are the coins forever lost, or is the transaction voided as if it never was attempted?

user15567: voided as if it never was attempted  
assuming here you're spending from a multisig wallet and hence >1 parties need to sign. As @user36303 and @Murch♦ pointed out, if the TX is not fully signed, its not really a TX yet and the original balance on this multisig wallet is still the unspent balance.

user5406: Only valid transactions transfer control of balances. Since the transaction was never completed, the balances remain under control of the original owners.

user36303: The transaction is not fully signed, so it will not be included in a block, and thus the coins will not be moved from where they are. Only what's in a block can move coins, and anything that causes a transaction to not verify will cause that transaction to not be included.

37352: <p>In a multi-sig transaction, if one party refuses to sign, what happens to coins?  Are the coins forever lost, or is the transaction voided as if it never was attempted?</p>
 15567: <p>voided as if it never was attempted  </p>

<p>assuming here you're spending from a multisig wallet and hence >1 parties need to sign. As @user36303 and @Murch♦ pointed out, if the TX is not fully signed, its not really a TX yet and the original balance on this multisig wallet is still the unspent balance.</p>
 5406: <p>Only valid transactions transfer control of balances. Since the transaction was never completed, the balances remain under control of the original owners.</p>
 36303: <p>The transaction is not fully signed, so it will not be included in a block, and thus the coins will not be moved from where they are. Only what's in a block can move coins, and anything that causes a transaction to not verify will cause that transaction to not be included.</p>
