Pay to Contract Protocol

[githubsands]

Sequence to implement BIP175, pay to contract protocol as well as other utilities that will allow recipients and conferees to interact with the protocol under different circumstances.

See https://github.com/bitcoin/bips/blob/master/bip-0175.mediawiki & https://arxiv.org/pdf/1212.3257v1.pdf for more details.

---

• Create CoinTypeKey function to grab coin type key (or basepayment hash) within the wallets clients local database. This is to be used within getPayToContractAddress.

• Required additions to dcrd/dcrjson to allow RPCs from client to dcrd server.

• CreatehashContracts, createContractArray, lexiSort functions for future use in functions within legacyrpc/methods.go.

• Create getContractsHash and getPayToContractAddress methods within legacyrpc/methods.go

• Refactor hashContracts to use blake256

• Refactor lexiSort to use golang standard library - sort

• Refactor getContractHash and getPayToContractAddress to utilize less of the heap

• Implement required help messages in dcrwallet/internal for newly created RPC calls. Go Generate will also need to be ran in on legacyrpc/methods.go

• Implement getContractHash & getPayToContractAddress as grpc

• Create functions verifyContractHash and verifyContractHashAddress that allows the conferrer to verify the contract and P2PKH contract hash of the recipient.

• Add createContract method within legacyrpc/methods.go. This will add ability to create "simple" contracts from the dcrwallet cli itself. And implement required help messages within dcrwallet/internal.

• Refactor createContracyArray, hashContracts, getContractHash, getPayToContractAddress to include the createContract optionality.

• Include P2PKH contract hashes in the wallets database. Work will have to be done in wallet.go
  i.e get:
  getaddressbycontract : registers addresses in the database not by account by by contracts.
  getaddressbyconferee : registers addressees with their respected conferees.

Other:

This leads me to the thought of registering addresses to conferrees.

i.e registeraddreswithconferree takes in a address and a conferree and links them together.

[githubsands]

Got this going

[githubsands]

Wallet function, CoinTypeKey created here: 276f0af

[githubsands]

RPCs getcontracthash && getpaytocontracthash #1595