Support "friendly" transfers

[will-holley]

Scenario:

• Alice wants to transfer the token to her other wallet.

Current Limitations:

• Alice needs to have the working capital in her new wallet in order to pay for purchase price & a new deposit.

Proposed Solutions:

• Alice can transfer the token to her other wallet. In doing so, the new wallet inherits the tax burden and receives Alice's current deposit; effectively Alice is foregoing her deposit and payment from a buyout.

Unintended Consequences:

• Alice could exploit this transfer mechanism to sell to Bob in an off-chain negotiated deal.
  • Bob would pay Alice p where p > purchase price + current deposit; otherwise it's cheaper for Bob to purchase at p > purchase price and set the deposit based on his intended hold period
  • What is Bob's incentive to do this deal rather than purchasing outright? There isn't one that I can see besides Alice paying the gas instead of Bob.

[vicsn]

I'd say we just allow transferFrom/safeTransferFrom as you suggest.

If Alice wants to transfer a token to another wallet owned by herself or Bob, she could also create a single transaction to lower the price, buy the token and set an increased price again. I don't think this is a scenario we can or want to protect against. The PCO model is to prevent Alice from keeping the asset for herself even if she doesn't value it as much as others.