code: function MerkleBlock(options) {
    if (!(this instanceof MerkleBlock))
      return new MerkleBlock(options);
  
    AbstractBlock.call(this);
  
    this.txs = [];
    this.hashes = [];
    this.flags = DUMMY;
  
    this.totalTX = 0;
    this._tree = null;
  
    if (options)
      this.fromOptions(options);
  }
docs: Represents a merkle (filtered) block.
  @alias module:primitives.MerkleBlock
  @constructor
  @extends AbstractBlock
  @param {NakedBlock} options