Systems and methods for accessing digital assets in a blockchain using global consent contracts
A consent block is a type of block that may be stored in a blockchain. Each consent block has an owner and may store an owner consent contract, i.e., a smart contract containing owner-specified access rules that determine who may access data assets that are stored in other blocks of the blockchain and owned by the same owner. The consent block may alternatively store a global consent contract containing global access rules that supersede owner-specified access rules. The consent block also stores a hash value determined from the consent contract and a previous hash value of the block immediately preceding the consent block. The consent contract and the position of the consent block in the blockchain are verifiable from the hash value. Each consent block, once added to the blockchain, becomes part of the immutable record of data stored in the blockchain, and therefore leaves an auditable trail.
1. A blockchain access method, comprising:
adding to a blockchain a consent block storing:
a global consent contract containing one or more global access rules that determine access, for an entity other than an owner of the global consent contract, to a portion of an asset that is stored in another block of the blockchain, the asset having an owner that is different from the entity; and
a hash value determined from at least the global consent contract and a previous hash value of a block, of the blockchain, immediately preceding the consent block;
wherein the global consent contract and a position of the consent block in the blockchain are verifiable from the hash value.
2. The blockchain access method of claim 1 , wherein the portion of the asset consists of the entire asset.
3. The blockchain access method of claim 1 , wherein the one or more global access rules supersede one or more owner-specified access rules from one or more owner consent contracts stored in other blocks of the blockchain.
4. The blockchain access method of claim 3 , wherein the one or more owner consent contracts includes an updated owner consent contract containing one or more updated owner-specified access rules that replace the one or more owner-specified access rules.
5. The blockchain access method of claim 3 , wherein the one or more owner-specified access rules include a public identifier that identifies the entity.
6. The blockchain access method of claim 1 , wherein the one or more global access rules are superseded by one or more owner-specified access rules from one or more owner consent contracts stored in other blocks of the blockchain.
7. The blockchain access method of claim 6 , wherein the one or more owner consent contracts includes an updated owner consent contract containing one or more updated owner-specified access rules that replace the one or more owner-specified access rules.
8. The blockchain access method of claim 6 , wherein the one or more owner-specified access rules include a public identifier that identifies the entity.
9. The blockchain access method of claim 1 , wherein the one or more global access rules determine access to the portion of the asset based on a specified asset type of the asset.
10. The blockchain access method of claim 1 , wherein the one or more global access rules include one or more attributes that identify the portion of the asset to which the access is determined.
11. The blockchain access method of claim 1 , the one or more global access rules blocking access to the entity from viewing the portion of the asset.
12. The blockchain access method of claim 1 , the one or more global access rules including an entity type that determines a plurality of entities to which the one or more global access rules apply.