docs: add data provider consent spec for protocol devs

.gitbook/3-protocol-devs/1-dep-specs/3-data-provider-consent.md

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+# Data Provider Consent
+
+- Status: Draft
+- Crated: 2023-01-04
+- Modified: 2023-01-04
+- Authors
+    - Youngjoon Lee <yjlee@medibloc.org>
+    - Gyuguen Jang <gyuguen.jang@medibloc.org>
+    - Hansol Lee <hansol@medibloc.org>
+    - Myongsik Gong <myongsik_gong@medibloc.org>
+    - Inchul Song <icsong@medibloc.org>
+
+
+## Synopsis
+
+This document is about providing data through [DEP](../../1-users/3-data-exchange/0-about-dep.md).
+Before providers provide their data to consumers, the data must be validated from oracle whether the data is the correct data specified in the deal.
+Providers can send a request for validation to one of the oracles registered in Panacea, and the oracle will validate the data using confidential computing without any exposure of the data.
+As a result of a data validation, oracle will issue a certificate to the provider.
+Providers can consent to provide their data by submitting the certificate to Panacea, and will be rewarded by providing the data.
+In all of these processes, the data is transmitted with encryption and stored off-chain.
+
+### Motivation
+
+Data should be provided by providers based on their data ownership, and the reward should be distributed in transparent and fair manner.
+To do so, providers use digital signature as consent to provide the data.
+
+### Definitions
+
+- `Data Provider`, `Data Consumer`, and `Oracle` are defined in [User Flow](./1-user-flow.md)
+- `Deal` is defined in [Data Deal](./2-data-deal.md)
+- `Certificate`: a certificate that the data is validated to be provided to the deal, which is issued by oracle.
+
+## Technical Specification
+
+Before provider provides the data to deal, data should be validated by the oracle.
+If the data is successfully validated to be provided, the provider will have a `Certificate` like below (more about [Data Validation](./4-data-validation.md)):
+
+```proto
+message Certificate {
+  UnsignedCertificate unsigned_certificate = 1;
+  bytes signature = 2;
+}
+
+message UnsignedCertificate {
+    string cid = 1;
+    string unique_id = 2;
+    string oracle_address = 3;
+    uint64 deal_id = 4;
+    string provider_address = 5;
+    string data_hash = 6;
+}
+```
+
+Using the `Certificate`, provider can submit consent to provide the data.
+
+```proto
+message MsgSubmitConsent {
+  Consent consent = 1;
+}
+
+message Consent {
+  Certificate certificate = 1;
+}
+```
+
+When this consent is submitted, blockchain will check:
+- if the data is provided by the owner of the data
+- if the data is validated by a registered and active oracle
+- if the data is provided in duplicate
+
+If all checks pass, rewards are distributed to the provider and oracle(more about [incentive](./6-incentives.md)).
+
+## Backwards Compatibility
+
+Not applicable.
+
+## Forwards Compatibility
+
+Not applicable.
+
+## Example Implementations
+
+Coming soon.
+
+## Other Implementations
+
+None at present.
+
+## History
+
+- 2023-01-04: Initial draft finished
+
+## Copyright
+
+All content herein is licensed under [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0).