this.identifier = Preconditions.checkNotNull(identifier, "Identifier should not be null");
this.backingTxs = Preconditions.checkNotNull(backingTxs, "Backing transactions should not be null");
}
this.identifier = Preconditions.checkNotNull(identifier, "Identifier should not be null");
this.backingTxs = Preconditions.checkNotNull(backingTxs, "Backing transactions should not be null");
}