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feat(platform)!: prove data contract versions without the contracts via a PV14 version item - #4749
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QuantumExplorer merged 11 commits intoSep 14, 2026
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…ia a PV14 version item `getDataContractsLatestVersions` (#4739) exists so a client can check that the contracts it holds are still current, but its proved form was the multi-contract proof: GroveDB proves a matched key together with its value, and the version lived only inside the serialized contract, so the proof carried every contract whatever `include_contracts` said. From protocol version 14 every contract now carries a four-byte big-endian version item at key 2 of its root subtree (`[64, id] / 2`), beside the contract (key 0) and its documents (key 1): - `add_contract_to_storage` v1, selected by the new `DRIVE_CONTRACT_METHOD_VERSIONS_V4` that `DRIVE_VERSION_V9` (PV14) uses, writes the item on every contract create and update, for both the plain and the history-keeping layout, with the contract element's flags. - The first block of PV14 backfills the item for every contract already in state (`Drive::add_version_items_to_all_contracts`, idempotent, paged). - A new query helper slot, `data_contract_query_helpers.latest_versions_read` (0 in the PV1-13 tables, 1 in `DRIVE_ABCI_QUERY_VERSIONS_V3`), gates the query without a wire change. Without `include_contracts` the proved form returns `prove_contracts_versions`, a proof of the items verified by `Drive::verify_contracts_versions`, and the unproved form answers from the contract cache on a hit and from the item (`fetch_contract_version`) on a miss, never loading a contract. With `include_contracts`, or on a state without the items, both forms behave as before. - The proof verifier branches on the same slot, so the Rust SDK, wasm-sdk and Evo SDK verify the small proof once they observe protocol version 14. The PV14 pinned app hash in the deterministic root hash test moves because of the extra element under the contract subtree. Devnets already running PV14 dev builds need a reset, since the first-block hook does not fire for them. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughProtocol 14 stores each contract version in a four-byte item. New Drive APIs read, prove, and verify these items. Latest-version queries use them when contracts are excluded. Protocol 14 migration backfills existing contracts, and fee and root-hash tests reflect the added storage. ChangesContract version item flow
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Merge Risk: 🟡 Moderate · up to The protocol upgrade could fail to complete on sufficiently large contract state, so the backfill should be bounded before merge. Two narrower query-contract issues also remain. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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…e PV14 version item From protocol version 14 a contract's root subtree holds one more element, the version item, so every document insert rehashes one more node (+740 credits of processing) and a contract create or update writes the item (+61200 credits). The tests that pin those fees at the latest protocol version move accordingly, and each moved baseline gets a protocol version 13 twin that stores the contract without the item and keeps the previous value, proving the change is gated to the unreleased protocol version. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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In `@packages/dapi-grpc/protos/platform/v0/platform.proto`:
- Around line 506-507: Update the documentation near the contract response
description to say “Every distinct requested id” instead of “Every requested
id,” accurately documenting that duplicate requested IDs are folded into one
entry by the BTreeSet-based implementation.
In
`@packages/rs-drive/src/drive/contract/migration/add_version_items_to_all_contracts.rs`:
- Around line 1-95: Bound add_version_items_to_all_contracts so one activation
transaction processes only a safe maximum number of contracts, persisting a
cursor for continuation across subsequent blocks; alternatively, reject
activation before starting when the total contract count exceeds the safe limit.
Ensure transition_to_version_14 can complete within one block’s resource budget
and preserve correct resumption without reprocessing contracts.
In `@packages/rs-drive/src/drive/contract/queries.rs`:
- Line 109: The distinct-ID count in fetch_contracts_versions_query must not be
truncated by an unchecked cast. Verify callers enforce the u16 maximum;
otherwise replace the as u16 conversion with u16::try_from and propagate a
suitable error when distinct_ids exceeds 65,535.
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book/src/drive/indexes.mdpackages/dapi-grpc/protos/platform/v0/platform.protopackages/rs-drive-abci/src/execution/check_tx/v0/mod.rspackages/rs-drive-abci/src/execution/platform_events/protocol_upgrade/perform_events_on_first_block_of_protocol_change/v0/mod.rspackages/rs-drive-abci/src/query/data_contract_based_queries/data_contracts_latest_versions/v0/mod.rspackages/rs-drive-proof-verifier/src/proof/data_contracts_latest_versions.rspackages/rs-drive-proof-verifier/src/types/data_contracts_latest_versions.rspackages/rs-drive/src/drive/contract/get_fetch/fetch_contract_version/mod.rspackages/rs-drive/src/drive/contract/get_fetch/fetch_contract_version/v0/mod.rspackages/rs-drive/src/drive/contract/get_fetch/mod.rspackages/rs-drive/src/drive/contract/insert/add_contract_to_storage/mod.rspackages/rs-drive/src/drive/contract/insert/add_contract_to_storage/v1/mod.rspackages/rs-drive/src/drive/contract/migration/add_version_items_to_all_contracts.rspackages/rs-drive/src/drive/contract/migration/mod.rspackages/rs-drive/src/drive/contract/mod.rspackages/rs-drive/src/drive/contract/paths.rspackages/rs-drive/src/drive/contract/prove/mod.rspackages/rs-drive/src/drive/contract/prove/prove_contracts_versions/mod.rspackages/rs-drive/src/drive/contract/prove/prove_contracts_versions/v0/mod.rspackages/rs-drive/src/drive/contract/queries.rspackages/rs-drive/src/drive/contract/version_item.rspackages/rs-drive/src/drive/document/insert/mod.rspackages/rs-drive/src/verify/contract/mod.rspackages/rs-drive/src/verify/contract/verify_contracts_versions/mod.rspackages/rs-drive/src/verify/contract/verify_contracts_versions/v0/mod.rspackages/rs-drive/tests/deterministic_root_hash.rspackages/rs-platform-version/src/version/drive_abci_versions/drive_abci_query_versions/mod.rspackages/rs-platform-version/src/version/drive_abci_versions/drive_abci_query_versions/v0.rspackages/rs-platform-version/src/version/drive_abci_versions/drive_abci_query_versions/v1.rspackages/rs-platform-version/src/version/drive_abci_versions/drive_abci_query_versions/v3.rspackages/rs-platform-version/src/version/drive_versions/drive_contract_method_versions/mod.rspackages/rs-platform-version/src/version/drive_versions/drive_contract_method_versions/v1.rspackages/rs-platform-version/src/version/drive_versions/drive_contract_method_versions/v2.rspackages/rs-platform-version/src/version/drive_versions/drive_contract_method_versions/v3.rspackages/rs-platform-version/src/version/drive_versions/drive_contract_method_versions/v4.rspackages/rs-platform-version/src/version/drive_versions/drive_verify_method_versions/mod.rspackages/rs-platform-version/src/version/drive_versions/drive_verify_method_versions/v1.rspackages/rs-platform-version/src/version/drive_versions/v9.rspackages/rs-platform-version/src/version/mocks/v2_test.rspackages/rs-sdk/src/platform/data_contracts_latest_versions.rspackages/wasm-sdk/src/queries/data_contract.rs
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…he PV14 version item Every document write under a contract stored from protocol version 14 rehashes one more node of the contract's root subtree, the version item, so the latest-version baselines of the document delete, replace, transfer, NFT set price and purchase, DPNS reference, token burn group action and direct purchase tests move by 740 credits per write. The protocol version 11 and 13 twins keep their values; the DPNS twin helper now stores its contracts at the protocol version under test instead of the latest one, which is what made those twins move too. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…imit Review follow-ups: the docs say every distinct requested id gets an entry, since duplicate ids fold; and the version item prover and verifier reject more than 65,535 distinct ids instead of letting the query limit truncate, so the saturating conversion in the shared query builder is never reached. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…on item The DPNS, family, family-with-nulls and withdrawals query integration tests pin the app hash after storing their contracts under the latest protocol version. From protocol version 14 the contract's version item is one more element under the contract's root subtree, so those fourteen pinned hashes move; the first version and protocol version 13 variants keep theirs. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…ized funds strategy test Pre-existing on v4.2-dev (its own workspace test job fails on this test at 28e7045): protocol version 14 lowers the contested document contribution to the vote resolution fund from 0.2 DASH to 0.1 DASH (VOTE_RESOLUTION_FUND_FEES v2), so two contenders fund 20_000_000_000 credits and the leftover distributed to the processing pool when the vote finishes is 19_810_000_000, not 39_810_000_000. Fixed here so the workspace test check can pass. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…t version item The latest-version historical query test pins the app hash twice after storing its contract under the latest protocol version; both move with the version item stored beside the contract from protocol version 14. The first-version test keeps its hashes. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## v4.2-dev #4749 +/- ##
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- Coverage 82.83% 82.64% -0.19%
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Files 2846 2855 +9
Lines 391893 394400 +2507
============================================
+ Hits 324606 325941 +1335
- Misses 67287 68459 +1172
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…ersion-proofs-fba757
…m the responding node's protocol version The SDK seeds mainnet, testnet and regtest clients at protocol version 13 and ratchets only after a proof verifies. A fresh client whose first proved call is getDataContractsLatestVersions would verify with the version 13 helper, expect the multi-contract proof, and reject the version item proof a version 14 network returns, so it could never ratchet through this query. The verifier now selects the shape from the protocol version the response metadata carries, which the quorum signature covers; a wrong shape can only fail verification. A client already at 14 likewise accepts the multi-contract proof of a network that has not activated yet. A wasm-sdk functional test pins a fresh local client to version 13 and makes this query its first call. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Review finding: [P2] Handle v14 proofs before the SDK learns v14 — addressed in the latest code In the reviewed commit Before posting, I checked current head |
QuantumExplorer
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Sep 15, 2026
Resolves the conflicts with the 99 commits v4.2-dev gained since the branch point and adapts the branch to them: - platform-wallet-storage: the profile-encoding migration is renumbered V008 -> V019 (v4.2-dev already ships V008-V018). The stamp columns now DEFAULT 1 and the migration marks the rows it finds 0, so only pre-V019 rows are ever decoded as legacy. The identities writer and both readers on the hard-delete schema (dashpay#4496) stamp and dispatch on `entry_format`; the dashpay writer stamps `profile_format`. The migrated-database walk moved to tests/sqlite_profile_address_encoding.rs (the crate's retired-table-name scan covers src/), backed by test-only legacy encoders. SCHEMA.md and the migration fingerprints updated. - swift-sdk: V4 is frozen through scripts/freeze_schema_models.py (FREEZES row at 787cac0) instead of a hand-written copy; the dash-v5.store fixture is written by this build; the migration tests join the fixture-based suite from dashpay#4644. - drive / drive-abci: PV14 fee and root-hash pins recomputed for DashPay contract v2 on top of the contract version item (dashpay#4749). - platform-wallet: base's re-seeded shield regression fixture kept; both sides' viewing-key bind tests kept; the FFI account-indices exports re-appended after base's new test modules. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Issue being fixed or feature implemented
getDataContractsLatestVersions(#4739) exists so a client can check that the contracts it already holds are still current without transferring them. Its proved form did not deliver that: it reused the multi-contract proof, and since GroveDB proves a matched key together with its value and the version number lived only inside the serialized contract, the proof carried every contract whateverinclude_contractssaid. Proof-using clients (wasm-sdk, Evo SDK, the Rust SDK by default) gained nothing.There was no query shape that could fix this on the existing state: contracts have no version-keyed layout (a history-keeping contract's revisions are keyed by block time, with key
0a sibling reference to the latest), and a merk proof never emits a matched key without its value.What was done?
From protocol version 14 every contract carries its version as a four-byte big-endian item at key
2of its root subtree ([64, id] / 2), beside the contract (key0) and its documents (key1).Storage (rs-drive)
add_contract_to_storagev1 writes the item on every contract create and update, for both the plain and the history-keeping layout, with the contract element's flags so its storage is paid for and refunded with the contract's. It is selected by the newDRIVE_CONTRACT_METHOD_VERSIONS_V4, which onlyDRIVE_VERSION_V9(PV14) uses; PV13 keeps writing nothing there.Drive::add_version_items_to_all_contractsbackfills the item for every contract already in state. It pages through the contract ids, is idempotent (a repeat leaves the root hash unchanged), and runs at the end oftransition_to_version_14.fetch_contract_version(raw read of the item,Nonefor a missing contract),fetch_contracts_versions_query(keys under[64]with subquery key2, shared by prover and verifier),prove_contracts_versionsandDrive::verify_contracts_versions(verification with absence: a missing id verifies asNone; unrequested, duplicate or malformed rows are rejected).Query (drive-abci + proof verifier)
data_contract_query_helpers.latest_versions_read, gates the behaviour with no wire change:0in the tables protocol versions 1 to 13 select,1inDRIVE_ABCI_QUERY_VERSIONS_V3(PV14). This follows the existingdocument_query_helperspattern, since the query tables version the wire surface, not behaviour.include_contracts, the proved form now returns the version item proof, and the unproved form answers from the contract cache on a hit and from the item on a miss, never loading a contract into the cache. Withinclude_contracts, or on a state without the items, both forms behave exactly as before.FromProofforDataContractsLatestVersionsselects the proof shape from the protocol version the response metadata carries (covered by the quorum signature), not from the client's own version: the SDK seeds mainnet, testnet and regtest clients at protocol version 13 and only ratchets after a proof verifies, so a fresh client whose first proved call is this query must still accept the version item proof of an upgraded network, and a client already at 14 must accept the multi-contract proof of a network that has not activated yet. A wasm-sdk functional test pins a fresh local client to 13 and makes this query its first call.Docs: proto comment, Rust SDK and wasm-sdk doc comments, verifier type docs, and the Platform Book bullet that names the contract subtree keys.
Proof size: in the tests the version item proof for three contracts is under a quarter of the multi-contract proof, and the bound is asserted; the savings grow with contract size (up to 16 KB per contract today).
How Has This Been Tested?
cargo clippy --all-targets -- -D warningsclean on platform-version, drive, drive-abci, drive-proof-verifier and dash-sdk;cargo check -p wasm-sdk --target wasm32-unknown-unknownclean;cargo fmt --checkclean.packages/rs-drive/tests/deterministic_root_hash.rs: the pinned PV14 app hash after applying DashPay moves because of the extra element under the contract subtree; re-pinned with a comment.addKnownContractfunctional test usedto.be(true), which the suite's callable assertions do not provide. v4.2-dev is merged into the branch.Breaking Changes
Consensus: from protocol version 14 the state layout under every contract's root subtree gains key
2, contract create and update write one more element (so their storage fees shift by that item), and the first block of PV14 backfills the item for every existing contract. Devnets already running PV14 dev builds need a reset, since the first-block hook does not fire for them. No wire change:GetDataContractsLatestVersionsRequestand its response are unchanged.Checklist:
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