We Claim:
5 1. A method at a computing device (110, 610, 710) in a public ledger cryptography
system, the method comprising:
creating a purpose string, the purpose string defining transaction parameters for an
account within the public ledger cryptography system;
creating a private key and associated public key for the account within the public ledger
10 cryptography system, the creating using the purpose string, wherein the public key is uniquely
bound to the purpose string;
receiving (630) a request from a second computing device (612) in the public ledger
cryptography system for the purpose string; and
providing (632) the purpose string to the second computing device (612) for use in
15 proof of generation verification of the public key during a transaction from the account within
the public ledger cryptography system.
2. The method of claim 1, wherein the purpose string defines at least one transaction
parameter selected from: a transaction value limit; a transaction frequency limit; a transaction
20 geography limit; a transaction time period limit; a transaction location limit; a limit on a
location of an account holder of the account within the public ledger cryptography system
relative to a recipient during the transaction; and a limit on goods or services permitted in a
transaction.
25 3. The method of claim 1, wherein the purpose string provides an identifier for an account
holder of the account within the public ledger cryptography system.
4. The method of claim 3, wherein the identifier is biometric data for of the account holder.
30 5. The method of claim 3, wherein the identifier is a name of the account holder.
6. The method of claim 3, wherein the identifier is an image of a document for the account
holder.
7. The method of claim 1, wherein the providing is performed on account creation with a
network element.
8. The method of claim 7, wherein the network element is associated with the public
5 ledger cryptography system.
9. A computing device (110, 610, 710) in a public ledger cryptography system, the
computing device comprising:
a processor (720); and
10 a communications subsystem (730),
wherein the computing device is configured to:
create a purpose string, the purpose string defining transaction parameters for an
account within the public ledger cryptography system;
create a private key and associated public key for the account within the public ledger
15 cryptography system, the creation using the purpose string, wherein the public key is uniquely
bound to the purpose string;
receive a request from a second computing device (612) in the public ledger
cryptography system for the purpose string; and
provide the purpose string to the second computing device (612) for use in proof of
20 generation verification of the public key during a transaction from the account within the public
ledger cryptography system.
10. The computing device (110, 610, 710) of claim 9, wherein the purpose string defines
at least one transaction parameter selected from: a transaction value limit; a transaction
25 frequency limit; a transaction geography limit; a transaction time period limit; a transaction
location limit; a limit on a location of an account holder of the account within the public ledger
cryptography system relative to a recipient during the transaction; and a limit on goods or
services permitted in a transaction.
30 11. The computing device (110, 610, 710) of claim 9, wherein the purpose string provides
an identifier for an account holder of the account within the public ledger cryptography system.
12. The computing device (110, 610, 710) of claim 11, wherein the identifier is biometric
data for of the account holder.
13. The computing device (110, 610, 710) of claim 11, wherein the identifier is a name of
the account holder.
5 14. The computing device (110, 610, 710) of claim 11, wherein the identifier is an image
of a document for the account holder.
15. The computing device (110, 610, 710) of claim 9, wherein the computing device is
configured to provide on account creation with a network element.
10
16. The computing device (110, 610, 710) of claim 15, wherein the network element is
associated with the public ledger cryptography system.