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As the timestamping authority is now always the notary service, contracts should no longer be using name-based lookup of the timestamping authority (as this will generally be wrong). This introduces a new "timestamp" property on a transaction, and updates most contracts to refer to it. In some cases (IRS, CommercialPaper) there are transactions with no input states to derive notary from, that use timestamps. In these cases a notary is specified in the command.