Participation certificate standard. tokens that are not transferrable. they represent receivables for future deliverable assets.
PC's get created exactly once (issuance) and destroyed once (redemption). they are not transfer-able. the purpose of the non-transfer is that in early stages of a venture it is not necessarily desirable to have a market created for tokens. To avoid adding a pause function to standard ERC20, the cleaner approach is to split the financing and issuance into 2 stages.
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