Who is Worthy to Open the Seals? The Lamb that was Slain is Worthy

Who is worthy to open the book, and to loose the seals thereof? Revelation 5:2

And one of the elders saith unto me, Weep not: behold, the Lion of the tribe of Juda, the Root of David, hath prevailed to open the book, and to loose the seven seals thereof. And I beheld, and, lo, in the midst of the throne and of the four beasts, and in the midst of the elders, stood a Lamb as it had been slain, Revelation 5:5,6

The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world. John 1:29