Sent in an IQ get stanza to get block references from the destination. Optional attribute referring to the last block reference received. The first block reference returned will be the first block reference immediately following this block reference. Maximum number of block references to return. The destination node might decide to lower the number of block references to return. Response to a getBlockReferences request. Contains a sequence of block references. Lets the client requesting block references know if there are more block references available. Represents a block reference. The local ID of the block reference. These IDs are unique on the local machine only. When a node retrieves a block, it receives a new ID on that machine. The local ID is used for synchronization purposes. Personal Event sent by a Neuro-Ledger, when a block has been added. Personal Event sent by a Neuro-Ledger, when a block has been deleted. Hash digest of block. Digital signature of block, made by creator. Optional link to another block, in case block has been updated. Name of collection in which the block resides. Identity of creator. When block was created. Timestamp when block was updated, if updated. Timestamp when block expires, if it expires. Status of block. URL to block resource. When requesting information about the block from the resource, use the Accept header to define desired response encoding: application/octet-stream for a binary representation of the block suited for distribution to other nodes. text/xml for an XML Document response with embedded objects encoded in XML. application/json for a JSON Document response with embedded objects encoded in JSON. Size of block, in bytes. Possible block states. Block is claimed to be valid. Block has been updated. Link points to updated block. Block hasbeen deleted.