Exhibit 99.1

Joint Filing Agreement

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, each of the persons named below agrees to the joint filing of this Schedule 13D, including further amendments thereto, with respect to the common shares, without par value, of Metalla Royalty & Streaming Ltd. held by and further agrees that this Joint Filing Agreement be filed with the Securities and Exchange Commission as an exhibit to such filing; provided, however, that no person shall be responsible for the completeness or accuracy of the information concerning the other persons making the filing unless such person knows or has reason to believe such information is inaccurate (as provided in Rule 13d-1(k)(1)(ii)). This Joint Filing Agreement may be executed in one or more counterparts, all of which together shall constitute one and the same instrument.

IN WITNESS WHEREOF, the persons named below have executed this Joint Filing Agreement as of the date set forth below.

	February 4, 2026

	TETHER GLOBAL INVESTMENTS FUND, S.I.C.A.F., S.A.

	By:	/s/ Giancarlo Devasini
	Name:	Giancarlo Devasini
	Title:	President

	Tether Investments, S.A. DE C.V.

	By:	/s/ Giancarlo Devasini
	Name:	Giancarlo Devasini
	Title:	Sole Administrator

	/s/ Giancarlo Devasini
	Giancarlo Devasini, individually

Metalla Royalty & Streaming Ltd. SCHEDULE 13D/A