bond to override lock limit

contracts/core/Constants.sol

@@ -44,4 +44,5 @@ abstract contract Constants {
     uint256 constant MAXBALANCE_UPPERBOUND = 1e8 ether;
     uint256 constant REPUTATION_LOWERBOUND = 1e2 ether;
     uint256 constant LOCKAMOUNT_UPPERBOUND = 1e6 ether;
+    uint256 constant BOND_DIVISOR = 4; // 6,25%
 }

contracts/core/DataTypes.sol

@@ -13,6 +13,7 @@ library DataTypes {
         ERC20 token;
         address buyerAddress;
         address seller;
+        bool bond;
     }
 
     // prettier-ignore

contracts/p2pix.sol

@@ -135,7 +135,8 @@ contract P2PIX is BaseUtils {
         ERC20 token,
         uint80 amount,
         bytes32[] calldata merkleProof,
-        uint256[] calldata expiredLocks
+        uint256[] calldata expiredLocks,
+        bool bond
     ) public nonReentrant returns (uint256 lockID) {
         unlockExpired(expiredLocks);
 
@@ -154,10 +155,17 @@ contract P2PIX is BaseUtils {
 
         bytes32 _pixTarget = getPixTarget(seller, token);
 
-        // transaction forwarding must leave `merkleProof` empty;
-        // otherwise, the trustedForwarder must be previously added 
-        // to a seller whitelist.
-        if (merkleProof.length != 0) {
+        if (bond){
+          SafeTransferLib.safeTransferFrom(
+              token,
+              _msgSender(),
+              address(this),
+              amount >> BOND_DIVISOR
+          );
+        } else if (merkleProof.length != 0) {
+            // transaction forwarding must leave `merkleProof` empty;
+            // otherwise, the trustedForwarder must be previously added 
+            // to a seller whitelist.
             _merkleVerify( merkleProof, sellerAllowList(seller), _msgSender());
 
         } else if ( amount > REPUTATION_LOWERBOUND && msg.sender == _msgSender() ) {
@@ -178,7 +186,8 @@ contract P2PIX is BaseUtils {
             amount,
             token,
             _msgSender(),
-            seller
+            seller,
+            bond
         );
 
         _addLock(bal, l);
@@ -237,7 +246,7 @@ contract P2PIX is BaseUtils {
         SafeTransferLib.safeTransfer(
             t,
             l.buyerAddress,
-            lockAmount
+            l.bond ? lockAmount + lockAmount >> BOND_DIVISOR : lockAmount
         );
 
         emit LockReleased(l.buyerAddress, lockID, lockAmount);