text: const mongoose = require('mongoose');
  
  function UTXO(conn) {
      this.model = conn.model('UTXO', new mongoose.Schema({
          __v: { select: false, type: Number },
          _id: { required: true, select: false, type: String },
          address: { index: true, required: true, type: String },
          blockHeight: { index: true, required: true, type: Number },
          n: { required: true, type: Number },
          txId: { required: true, type: String },
          value: { required: true, type: Number }
      }, { versionKey: false }), 'utxos');
  }
  
  module.exports.UTXO = UTXO;