Systems and methods for storage, generation and verification of tokens used to control access to a resource

1. A computer-implemented access method, comprising:

(i) submitting, to a blockchain, an access blockchain transaction addressed to a derived public key derived at least in part from a secret value and a public key;

(ii) generating a verification public key based at least in part on the secret value and the public key;

(iii) comparing the derived public key and the verification public key; and

(iv) based on the comparison of step (iii):

(a) allocating at least one of the derived public key and/or the verification public key as a further public key for verifying a further derived public key; and

(b) granting access to a resource associated with at least one of the secret value and/or the derived public key;

wherein the secret value is a data item of a first one-way function chain of data items, and further comprising:

(v) providing a verification data item of the first one-way function chain;

(vi) applying the first one-way function to the data item;

(vii) comparing output of step (vi) to the verification data item;

(viii) performing step (iv) based also on outcome of step (vii);

(ix) providing a verification data item of a second one-way function chain of data items; and

(x) submitting, to a blockchain, an exchange blockchain transaction unlockable upon provision of at least one verification item of the first one-way function chain and the verification data item of the second one-way function chain, wherein such unlocking causes at least one data item of the second one-way function chain to be associated with a resource;

wherein steps (i), (v), (ix), and (x) are performed by a first party and steps (ii), (iii), (iv), and (vi) to (viii) are performed by a second party; and

wherein the method further comprises sending the secret value from a first user to a second user.

2. The method of claim 1 , wherein step (iii) comprises the application of at least one test or criterion.

3. The method of claim 2 , wherein the at least one test or criterion comprises an assessment as to whether the derived public key matches, or is identical to, the verification public key.

4. The method of claim 2 , wherein the at least one test or criterion comprises a threshold-based assessment.

5. The method of claim 1 , further comprising repeating steps (ii) to (iv) using a further secret value and the further public key.

6. The method of claim 1 , further comprising unlocking the exchange blockchain transaction and repeating steps (ii) to (iv) using a data item of the second one-way function chain and the verification data item of the second one-way function chain.

7. The method of claim 1 , further comprising submitting, to a blockchain, a return blockchain transaction arranged to return control of an input of the exchange blockchain transaction after elapse of a lock time.

8. The method of claim 1 , further comprising storing an initial data item of a one-way function chain, from which at least one data item of the one-way function chain is calculable.

9. The method of claim 1 , wherein step (viii) further comprises deleting the verification data item.

10. The method of claim 1 , wherein an access blockchain transaction comprises information identifying the resource.

11. A system, comprising:

a processor; and

memory including executable instructions that, as a result of execution by the processor, causes the system to:

(i) submit, to a blockchain, an access blockchain transaction addressed to a derived public key derived at least in part from a secret value and a public key;

(ii) generate a verification public key based at least in part on the secret value and the public key;

(iii) compare the derived public key and the verification public key; and

(iv) based on the comparison of step (iii):

(a) allocate at least one of the derived public key and/or the verification public key as a further public key for verifying a further derived public key; and

(b) grant access to a resource associated with at least one of the secret value and/or the derived public key;

wherein the secret value is a data item of a first one-way function chain of data items, and the executable instructions further cause the system to:

(v) provide a verification data item of the first one-way function chain;

(vi) apply the first one-way function to the data item;

(vii) compare output of step (vi) to the verification data item;

(viii) perform step (iv) based also on outcome of step (vii);

(ix) provide a verification data item of a second one-way function chain of data items; and

(x) submit, to a blockchain, an exchange blockchain transaction unlockable upon provision of at least one verification item of the first one-way function chain and the verification data item of the second one-way function chain, wherein such unlocking causes at least one data item of the second one-way function chain to be associated with a resource;

wherein steps (i), (v), (ix), and (x) are performed by a first party and steps (ii), (iii), (iv), and (vi) to (viii) are performed by a second party; and

wherein the executable instructions further cause the system to send the secret value from a first user to a second user.

12. A non-transitory computer-readable storage medium having stored thereon executable instructions that, as a result of being executed by a processor of a computer system, cause the computer system to:

(i) submit, to a blockchain, an access blockchain transaction addressed to a derived public key derived at least in part from a secret value and a public key;

(ii) generate a verification public key based at least in part on the secret value and the public key;

(iii) compare the derived public key and the verification public key; and

(iv) based on the comparison of step (iii):

(a) allocate at least one of the derived public key and/or the verification public key as a further public key for verifying a further derived public key; and

(b) grant access to a resource associated with at least one of the secret value and/or the derived public key;

wherein the secret value is a data item of a first one-way function chain of data items, and the executable instructions further cause the computer system to:

(v) provide a verification data item of the first one-way function chain;

(vi) apply the first one-way function to the data item;

(vii) compare output of step (vi) to the verification data item;

(viii) perform step (iv) based also on outcome of step (vii);

(ix) provide a verification data item of a second one-way function chain of data items; and

(x) submit, to a blockchain, an exchange blockchain transaction unlockable upon provision of at least one verification item of the first one-way function chain and the verification data item of the second one-way function chain, wherein such unlocking causes at least one data item of the second one-way function chain to be associated with a resource;

wherein steps (i), (v), (ix), and (x) are performed by a first party and steps (ii), (iii), (iv), and (vi) to (viii) are performed by a second party; and

wherein the executable instructions further cause the computer system to send the secret value from a first user to a second user.

13. The system of claim 11 ,

wherein step (iii) comprises the application of at least one test or criterion.

14. The system of claim 11 ,

wherein the executable instructions further cause the system to repeat steps (ii) to (iv) using a further secret value and the further public key.

15. The system of claim 11 ,

wherein the memory further causes the system to unlock the exchange blockchain transaction and repeat steps (ii) to (iv) using a data item of the second one-way function chain and the verification data item of the second one-way function chain.

16. The non-transitory computer-readable storage medium of claim 12 , wherein step (iii) comprises the application of at least one test or criterion.

17. The non-transitory computer-readable storage medium of claim 12 , wherein the executable instructions further cause the computer system to at least repeat steps (ii) to (iv) using a further secret value and the further public key.

18. The non-transitory computer-readable storage medium of claim 12 , wherein the executable instructions further cause the computer system to at least unlock the exchange blockchain transaction and repeat steps (ii) to (iv) using a data item of the second one-way function chain and the verification data item of the second one-way function chain.