async getPendingTxs() {
    const addr = await this.getOrGenerateAddress();
    let txs = await this._listtransactions();
    txs = txs.result;
    let result = [];
    for (let tx of txs) {
      if (tx.confirmations < 3 && tx.address === addr && tx.category === 'receive') {
        result.push(tx);
      }
    }
    return result;
  }
Returning onchain txs for user's address that are less than 3 confs

@returns {Promise<Array>}