| http://www.w3.org/ns/prov#value | - These properties, along with the use of blind signatures, ensure the anonymity of the payer as well as untraceability and unlinkability of his transactions. [0114]FIG. 4 shows a payment device (PD) (e.g., a mobile phone), comprising a crypto-processor (CP) that is a processor capable of performing, in particular, complex mathematical calculations such as encryption and decryption operations in an
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