Lists block hashes from '', up to the last checkpoint, sorted with decreasing fitness. Without arguments it returns the head of the chain. Optional arguments allow to return the list of predecessors of a given block or of a set of blocks.
A chain identifier. This is either a chain hash in Base58Check notation or a one the predefined aliases: 'main', 'test'.
The requested number of predecessors to return (per request; see next argument).
block_hash (Base58Check-encoded) An empty argument requests blocks starting with the current head. A non empty list allows to request one or more specific fragments of the chain.
A date in seconds from epoch When min_date is provided, blocks with a timestamp before min_date are filtered out. However, if the length parameter is also provided, then up to that number of predecessors will be returned regardless of their date.