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web site creator, and shopping cart hosting information: Even then, nothing can prevent both from agreeing to falsify the record to avoid sales tax [16]. Registration systems reduce the risk in electronic commerce by establishing trust through authentication and nonrepudiation using set standards, which in turn drives cost efficiencies and opens new avenues for commerce. The verifier isresponsible for checking the veracity of all customer information, public and private. First, new records in the database are added only at the end, making the index order k the same as timestamp order.

For example, pharmacists might need to ensure that medicalprescriptions are signed by doctors but they do not need to know the specific identities ofthe doctors involved. Accredited firms must also befinancially secure and well-insured against error or bankruptcy. When a user adds or removes money from a pay cash account, she usually reveals personal information. Signed digital checks (such as netcheque [13] and the financial services technology consortium system) must include some of this information, and customers wanting warranties demand the rest.