Function for secondary trading of encumbrances

[adrianmcli]

I originally made a comment here regarding this: ethereum/EIPs#7246 (comment)

I like the idea for the EIP7246 standard but I believe it's necessary to bake in a way (within the standard) to transfer encumbrances. So here is my proposed addition:

function transferEncumbranceRights(address owner, address newTaker, uint amount) external {
    // Ensure caller has enough encumbrance for the transfer
    require(encumbrances[owner][msg.sender] >= amount, "Insufficient encumbrance");

    // Reduce the encumbrance of the old taker
    encumbrances[owner][msg.sender] -= amount;

    // Increase the encumbrance of the new taker
    encumbrances[owner][newTaker] += amount;

    // Emit an event for tracking
    emit EncumbranceRightsTransferred(owner, msg.sender, newTaker, amount);
}

event EncumbranceRightsTransferred(
    address indexed owner, 
    address indexed oldTaker, 
    address indexed newTaker, 
    uint amount
);

I might be completely off-base here, but wanted to get the discussion started. I am also happy to make a PR.

Another alternative to address this use-case would be to simply require the issuing of receipt tokens whenever an encumbrance is created. But I think that might be too much overhead compared to adding this simple function.

Please let me know your thoughts.

[CEOBert]

This is a great point @adrianmcli , mechanically (and in an efficient manner) this should be possible to do in whole or in part and to a single or multiple new takers

This is important for the types of products it would enable on-top