Sign & Inject
Fleeting- Référence externe : https://tezosguides.com/wallet_integration/basics/sign/
After the watermark have been added, the bytes will need to be hashed into a 32-byte generic hash. Then the hash can be signed with the private key from the signature scheme chosen.
The signed operation in this case is the operations bytes with the signature appended to the end
tezos sign watermark
Before signing the operation bytes a watermark prefix must be appended. For regular operations used in a wallet this prefix will be 0x03.