Shareable and nested transactions on hash chains

A system comprising:

• a computer processor;
• a memory coupled to the computer processor;
• the memory comprising an application, wherein the application executes on the computer processor and is configured for:
• appending a data block of a transaction of a first hash chain to a second hash chain, the second hash chain originating from a tail block of the first hash chain;
• removing the data block from the transaction without invalidating the first hash chain by setting a tail block identifier of the second hash chain to a previous block appended to one of the first hash chain and the second hash chain prior to the data block;
• updating the transaction with updated transaction data by appending an updated data block to the second hash chain after removing the data block, wherein appending the updated data block comprises setting the tail block identifier of the second hash chain to the updated data block;
• and
• appending the second hash chain to the first hash chain by setting the tail block of the first hash chain to the tail block of the second hash chain.

A non-transitory computer readable medium comprising a computer readable program code, which, when executed by a computer processor, performs the functions of:

• appending a data block of a transaction of a first hash chain to a second hash chain, the second hash chain originating from a tail block of the first hash chain;
• removing the data block from the transaction without invalidating the first hash chain by setting a tail block identifier of the second hash chain to a previous block appended to one of the first hash chain and the second hash chain prior to the data block;
• updating the transaction with updated transaction data by appending an updated data block to the second hash chain after removing the data block, wherein appending the updated data block comprises setting the tail block identifier of the second hash chain to the updated data block;
• and
• appending the second hash chain to the first hash chain by setting the tail block of the first hash chain to the tail block of the second hash chain.