feat: add Walrus devnet Move code + an example of building against it

contracts/blob_store/Move.lock

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+# @generated by Move, please check-in and do not edit manually.
+
+[move]
+version = 2
+manifest_digest = "537E35587055E526E85CD04C400536AFFEC5CC0BE833EB4B5FAC245850C34C96"
+deps_digest = "F8BBB0CCB2491CA29A3DF03D6F92277A4F3574266507ACD77214D37ECA3F3082"
+dependencies = [
+  { name = "Sui" },
+]
+
+[[move.package]]
+name = "MoveStdlib"
+source = { git = "https://github.com/MystenLabs/sui.git", rev = "testnet-v1.29.2", subdir = "crates/sui-framework/packages/move-stdlib" }
+
+[[move.package]]
+name = "Sui"
+source = { git = "https://github.com/MystenLabs/sui.git", rev = "testnet-v1.29.2", subdir = "crates/sui-framework/packages/sui-framework" }
+
+dependencies = [
+  { name = "MoveStdlib" },
+]
+
+[move.toolchain-version]
+compiler-version = "1.29.2"
+edition = "2024.beta"
+flavor = "sui"
+
+[env]
+
+[env.testnet]
+chain-id = "4c78adac"
+original-published-id = "0x8bf57168d5acb0e83efa49905a326d0d624ff147955106d94fb09b6abdaa7bbc"
+latest-published-id = "0x8bf57168d5acb0e83efa49905a326d0d624ff147955106d94fb09b6abdaa7bbc"
+published-version = "1"

contracts/blob_store/Move.toml

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+[package]
+name = "blob_store"
+edition = "2024.beta"
+
+[dependencies]
+Sui = { git = "https://github.com/MystenLabs/sui.git", subdir = "crates/sui-framework/packages/sui-framework", rev = "testnet-v1.29.2" }
+
+[addresses]
+blob_store = "0x0"
+sui = "0x2"

contracts/blob_store/README.md

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+# blob_store
+
+This is the Move source code for the Walrus devnet instance. We provide this so developers can experiment with building Walrus apps that require Move extensions. This code is published on Sui testnet at package ID `0x8bf57168d5acb0e83efa49905a326d0d624ff147955106d94fb09b6abdaa7bbc`.
+
+A word of caution: Walrus testnet will use new Move packages with struct layouts and function signatures that may not be compatible with this package. Move code that builds against this package will need to rewritten.

contracts/blob_store/docs/msg_formats.txt

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+// Copyright (c) Mysten Labs, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+
+We document here off-chain message formats.
+
+Signatures
+----------
+
+All certified or signed messages SHOULD be signed with the scheme:
+BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_NUL_
+
+Public keys are 48 byte vector<u8>.
+Signatures are 96 byte vector<u8>.
+
+Signed Message Header
+---------------------
+
+All messages MUST start with a header of 3 + 8 bytes:
+- (Intent_type, Intent_version, Intent_app_id) : (u8, u8, u8)
+- epoch: u64
+- body: remaining vec<u8>, no length prefix
+
+The intent types are enumerated below, the version is as of now 0,
+and the app id for storage is 3. Th epoch is the storage epoch the
+signing storage node is in when signing the message.
+
+Intent types (add here):
+
+const SYNC_DONE_MSG_TYPE: u8 = 0;
+const BLOB_CERT_MSG_TYPE: u8 = 1;
+const INVALID_BLOB_ID_MSG_TYPE : u8 = 2;
+
+SYNC_DONE message
+-----------------
+
+The body is empty, and the epoch for which sync is done is the epoch in the header.
+
+
+BLOB_CERT message
+-----------------
+
+The body is the blob_id : u256 (32 bytes) of a blob. The storage node certified that all
+shards that were assigned to it for the message epoch have been received, checked and
+persisted to store.
+
+INVALID_BLOB_ID
+---------------
+
+The body is the blob_id : u256 (32 bytes) of a blob. The storage node certified that
+it has verified an inconsistency proof and the blob id is invalid.