Application US20190130398

REISSUING OBLIGATIONS TO PRESERVE PRIVACY
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US20190130398

1. A method performed by one or more computing systems for reissuing an obligation, the method comprising: (8) (3)

accessing a target transaction that represents a target obligation of an issuer, the target transaction identifying a quantity of an asset of the target obligation and a first entity as current owner of the target obligation, the issuer being obligated to provide the quantity of the asset to the current owner in accordance with terms of the target obligation, the target transaction identifying an ancestor transaction that was consumed when creating the target transaction, wherein an identifier of a second entity specified as then-owner of the target obligation in the ancestor transaction can be determined given the target transaction;

creating a transfer transaction of the target transaction that transfers ownership of the target obligation to the issuer to retire the target obligation, the transfer transaction identifying the target transaction; and

receiving from the issuer an indication that a reissue transaction was created that represents a reissued obligation of the issuer, the reissue transaction identifying the quantity of the asset of the reissued obligation and the first entity as current owner of the reissued obligation, wherein the reissue transaction does not identify any ancestor transactions so that the identifier of the second entity cannot be determined from the reissue transaction.

2. The method of claim 1 wherein the transactions are recorded in a blockchain. (0)

3. The method of claim 1 wherein the transactions are recorded in a distributed ledger that is not a blockchain. (0)

4. The method of claim 1 further comprising, prior to creating the transfer transaction, analyzing any ancestor transactions of the target transaction to determine whether a reissue criterion is satisfied. (0)

5. The method of claim 1 further comprising analyzing transactions to identify one or more target transactions to reissue. (0)

6. The method of claim 1 further comprising sending a reissue request to the issuer that identifies the transfer transaction and wherein when the reissue request identifies a third entity, the reissue transaction identifies the third entity as current owner of the reissued obligation and the identifier of the first entity and the second entity cannot be determined from the reissue transaction. (0)

7. The method of claim 1 wherein a transaction specifies a type of the asset. (0)

8. The method of claim 1 wherein the asset is fungible. (0)

9. The method of claim 1 wherein the reissue transaction specifies a quantity of the asset of the reissued obligation that is less than the quantity specified by the target obligation. (0)

10. A method performed by one or more computing systems for reissuing an obligation, the method comprising: (4) (3)

accessing a target transaction in which an issuer has a target obligation to a target owner specified in the target transaction, the target transaction having one or more ancestor transactions that each specify an owner;

retiring the target transaction so that the issuer no longer has the target obligation; and

receiving an indication that the issuer created a reissue transaction in which the issuer has a reissued obligation to the target owner that is specified in the reissue transaction, the reissue transaction not having any ancestor transactions.

11. The method of claim 10 wherein the retiring of the target transaction comprises creating a transfer transaction that transfers ownership of the target obligation to the issuer. (0)

12. The method of claim 10 wherein the target obligation specifies a quantity of an asset and the retiring of the target transaction comprises creating a first transfer transaction that transfers ownership of a portion of the quantity of the target obligation to the issuer and a second transfer transaction that transfers ownership of the remaining portion of the quantity of the target obligation to an owner different from the issuer. (0)

13. The method of claim 10 further comprising, prior to retiring the target transaction, analyzing one or more ancestor transactions of the target transaction to determine whether a reissue criterion is satisfied. (0)

14. The method of claim 10 further comprising analyzing transactions to identify one or more target transactions to reissue. (0)

15. A method performed by one or more computing systems for reissuing an obligation, the method comprising: (4) (3)

issuing obligations by an issuer, the issuing of an obligation including creating a transaction that specifies an owner of the obligation;

receiving a request to reissue a target obligation of an issuer, the request identifying a transfer transaction that specifies that the issuer is the owner of the target obligation and specifies the prior owner of the target obligation; and

creating a reissue transaction in which the issuer has a reissued obligation to the prior owner that is specified in the reissue transaction, the reissue transaction not having any ancestor transactions.

16. The method of claim 15 wherein each obligation specifies a quantity of an asset and the reissued obligation is for the same quantity as the target obligation. (0)

17. The method of claim 15 wherein each obligation specifies a quantity of an asset and the reissued obligation is for a quantity less than the quantity of the target obligation. (0)

18. The method of claim 15 wherein the transfer transaction specifies a target transaction whose output is input to the transfer transaction and that identifies an owner of the target obligation of the target transaction and wherein the target transaction specifies a further input transaction whose output is input to the target transaction and that specifies an owner of the further input transaction. (0)

19. The method of claim 15 wherein an owner is specified by a public key. (0)

20. A computing system for reissuing an obligation, the computing system comprising: (3) (2)

one or more computer-readable storage mediums storing computer-executable instructions for controlling the computing system to: access a target transaction in which an issuer has a target obligation to a target owner specified in the target transaction;

retire the target transaction so that the issuer no longer has the target obligation; and

receive an indication that the issuer has created a reissue transaction in which the issuer has a reissued obligation to the target owner that is specified in the reissue transaction; and

one or more processors for executing the computer-executable instructions stored in the one or more computer-readable storage mediums.

21. The computing system of claim 20 wherein the instructions that retire the target transaction create a transfer transaction that transfers ownership of the target obligation to the issuer. (0)

22. The computing system of claim 20 wherein the target obligation specifies a quantity of an asset and the instructions that retire the target transaction create a first transfer transaction that transfers ownership of a portion of the quantity of the target obligation to the issuer and a second transfer transaction that transfers ownership of the remaining portion of the quantity of the target obligation to an owner different from the issuer. (0)

23. The computing system of claim 20 wherein the target transaction specifies a prior transaction and the reissue transaction does not specify a prior transaction. (0)

24. A method performed by one or more computing systems for a providing a confidential identity for an entity, the method comprising: (2) (4)

generating a confidential public/private key pair;

generating a confidential certificate for the confidential identity, the confidential certificate including the confidential public key and a well-known name of the entity;

signing the confidential certificate with a well-known public key of the entity; and

sending the signed confidential certificate to another party.

25. The method of claim 24 further comprising: (1) (5)

receiving a nonce from the other entity;

generating a nonce;

sending the generated nonce to the other entity;

signing received nonce and the sent nonce; and

sending the signed nonces to the other entity.

26. The method of claim 25 wherein the signing of the confidential certificate and the signing of the nonce are performed by signing a combination of the confidential certificate and the nonces. (0)

27. The method of claim 24 further comprising: (0) (3)

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Application US20190130398

REISSUING OBLIGATIONS TO PRESERVE PRIVACY

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