A description and relevant links of lotus filecoin WalletSignMessage process

signObservations.md

WalletSignMessage gets called.

Here's an example Message type in json:

{
  "To": "t1hvuzpfdycc6z6mjgbiyaiojikd6wk2vwy7muuei",
  "From": "t1jdlfl73voaiblrvn2yfivvn5ifucwwv5f26nfza",
  "Nonce": 0,
  "Value": "1000",
  "Method": 0,
  "GasPrice": "1000",
  "GasLimit": "0",
  "Params": []
}

1. The message cid is calculated (steps below):

• message gets serialized using MarshalCBOR. byte array returned. (Could use cbor javascript npm module? cbor.encode(message))).
• cid is created using v1 prefix. (Could use js-multihash lib).
• new block is created via NewBlockWithCid. (Could use ipfs.block.put).
• block's cid is returned.

2. Cid is converted into bytes.

3. WalletSign is invoked with an address and message cid bytes, which invokes the Wallet.Sign method.

4. Message is signed

• key type is evaluated (as BLS or secp256k1). (if key type is secp256k1):
• message cid bytes are hashed with blake2b.Sum256. (Could use blake2b on npm).
• return secp256k1 signature of blake2b hash with private key. (Could use elliptic on npm).