NewAttributeAppendFilter creates a new instance of AttributeAppendFilter.

NewAttributeGetSink creates a new instance of AttributeGetSink.

NewAttributeSetFilter creates a new instance of AttributeSetFilter.

NewBlockAppendFilter creates a new instance of BlockAppendFilter.

NewBlockListSink creates a new instance of BlockListSink.

AttributeAppendFilter is a filter implementation for appending attribute.

AttributeGetSink is a sink implementation for getting a value of attribute.

BlockAppendFilter is a filter implementation for appending block.

BlockListSink is a sink implementation for getting a list of block addresses.