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@@ -73,7 +73,7 @@ OP_ENDIF
OP_CHECKSIG
```
When it's time for Alice and Bob to update state and invalidate the old state, Alice sends Bob her private key for the commitment point `cA2`. With this key, Bob now has both Alice's per commitment point private key `cA1` as well as his own revocation basepoint private key `rB1` which corresponds to the public key `RB1` he sent Alice earlier when Alice was constructing the commitment transaction. So now with these two pieces of information, Bob can derive the private key corresponding to the public key `Rev_A1` and therefore spend via the revocation output. He can calculate the private key as follows:
When it's time for Alice and Bob to update state and invalidate the old state, Alice sends Bob her private key for the commitment point `cA1`. With this key, Bob now has both Alice's per commitment point private key `cA1` as well as his own revocation basepoint private key `rB1` which corresponds to the public key `RB1` he sent Alice earlier when Alice was constructing the commitment transaction. So now with these two pieces of information, Bob can derive the private key corresponding to the public key `Rev_A1` and therefore spend via the revocation output. He can calculate the private key as follows:
```
rev_A1 = r_B1 * sha256( R_B1 || C_A1 ) + c_A1 * sha256( C_A1 || R_B1 )