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32 Bits. 256 Bits. 256 Bits. 32 Bits. 32 Bits. 32 Bits. 384 Bits. NONCE. TARGET. VERSION. TIME. hashMerkleRoot. hashPrevBlock. Padding + Length. 512 Bits. 512 Bits. IV 256 Bits. 256 Bits. 256 Bits. SHA256 0. SHA256 Hashing Algorithm. Padding + Length. H1. 512 Bits.

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  1. 32 Bits 256 Bits 256 Bits 32 Bits 32 Bits 32 Bits 384 Bits NONCE TARGET VERSION TIME hashMerkleRoot hashPrevBlock Padding + Length 512 Bits 512 Bits IV 256 Bits 256 Bits 256 Bits SHA2560 SHA256 Hashing Algorithm Padding + Length H1 512 Bits SHA2561 SHA256 Hashing Algorithm H0 256 Bits IV 256 Bits SHA2562 SHA256 Hashing Algorithm 256 Bits 000000... H2 256 Bits

  2. Message Block 512 Bits IV 256 Bits Message Compression Function (64 Rounds) Message Schedule A C D B F G H E Hash Value 256 Bits

  3. 8 x 32 bit Registers C B D E F G H A Ch(E,F,G) 0 Maj(A,B,C) 1 32 bit Adder Wt Kt 16 x 32 bit Registers R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 Mt 0 1

  4. Ct Ft Ht At Bt Dt Et Gt Kt Ch() Wt 1 Maj() 0 Bt+1 Dt+1 Et+1 Ft+1 Gt+1 Ht+1 Ct+1 At+1 (After 64 Rounds of the SHA256 Compression Function) H1i H2i H3i H4i H5i H6i H7i H0i H0i+1 H1i+1 H2i+1 H3i+1 H4i+1 H5i+1 H6i+1 H7i+1

  5. a b c a b c C.S.A. sc ps a+b+c a+b+c cost = 2 adders cost = 1+ε adders

  6. C.S.A. Ct Ft Ht At Bt Dt Et Gt Kt C.S.A. Ch() Wt C.S.A. C.S.A. 1 Maj() C.S.A. 0 C.S.A. Bt+1 Dt+1 Et+1 Ft+1 Gt+1 Ht+1 Ct+1 At+1

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