66 Commits (8bd76f14e18b79ad0f33a570c258f178eef47742)

Author	SHA1	Message	Date
Rongjian Lan	68ab784d63	Refactor quorum calculation and signature submission process (#3201)	4 years ago
Rongjian Lan	8057b05592	Fix multi-key related issues when keys are not in committee (#3132) ... * do not break if leader's multikeys not in committee (#3126) * do not break on leader commit (#3127) * Fix multi-key submitVote (#3129) * Add missing check on viewidbitmap * correct log level	4 years ago
Leo Chen	5c1cc8232c	Merge master to t3 0523 (#3085) ... * fix signers share computation to use only non-harmony nodes (#3008) * Add LastEpochInCommittee at prestaking epoch too (#3014) * write validator stats at the end of prestaking epoch (#3021) * write validator stats at the end of prestaking epoch * also need to write block reward accumulator * [build] enable static build by default (#2885) scripts/go_executable_build.sh -s (static build, default) scripts/go_executable_build.sh -S (non-static build) Signed-off-by: Leo Chen <leo@harmony.one> * Code formatting fix based on `staticcheck` (#3023) * fix some static check issues * more fixes according to staticcheck * add nil check on getHeader * Add more log info * [rpc] Revert change to v2 GetBalance RPC (#3037) * Cherrypick crosslink related fixes from t3 to master. (#3045) * Optimize crosslink verification logic and add more cache (#3032) * make crosslink broadcast smarter and more efficient (#3036) * adjust catch up speed to be a sane number * Fix crosslink broadcast condition (#3041) * Tx pool error report fix & local build fix (#3046) * [tx_list] Add transaction after you can fetch tx cost * [tx_pool] Add error sink reports for removed tx * Correct log levels for known transactions * Remove redundant hash to `enqueue` and `add` signatures * Update tests for signature changes * [build] Fix local build for MacOs * [tx_pool] Correct typo & logging level for known tx * [config] Create Testnet config * [node.sh] update testnet network config * [config] correct testnet config * [main] Enable beacon sync for explorer nodes (#3059) * [apr] should not use snapshot from last epoch, use current epoch snapshot (#3051) * use snapshot total delegation instead of current total delegation * should not use snapshot from last epoch, use current epoch snapshot (#3049) Co-authored-by: Rongjian Lan <rongjian.lan@gmail.com> Co-authored-by: Rongjian Lan <rongjian.lan@gmail.com> * cherrypick log level change * [rpc] Add active status back to Validator information [validator] Fix typo for ValidatorRPCEnhanced [Makefile] Change make exe to build non-static by default * [network] Added caching to node server (#3048) * [network] Added caching to node server * [network] renamed two singleflight.Group * [network] added two error handling * [network] added forget logic for single flight * [network] changed single flight to lru cache solution * [network] adjusted the cache size * [network] changed cache size to 10000 * Transaction api improvements (#3057) * [node] Add option to broadcast invalid tx (on by default) * update main args to take in broadcast invalid tx * update node.sh for new broadcast invalid tx option * [rpc] Do not submit transaction if tx has been finalized * Support legacy behavior and not return errors on tx submission * [main] make broadcasting invalid tx default false * [node] Fix formatting * Add timeouts for the explorer HTTP service * [test] State trans unit test (#3043) * completing create-validator tests generalizing create validator tests, started with edit validator tests one round completed before major refactor * [test] finished coding test TestCheckDuplicateFields * [test] finished debug TestCheckDuplicateFields * [test] Added TestDescription_EnsureLength * [test] added test in validator_test.go TestUpdateDescription * [test] Added test TestComputed_String * [test] refactored TestValidatorSanityCheck and added some message in error message returned from sanity check * [test] removed test index for debugging * [test] Added test TestValidatorWrapper_SanityCheck. Added value check for TestMarshalUnmarshalValidator. Fixed rlp usage defect in UnmarshalValidator * [test] added test TestVerifyBLSKeys * [test] added test TestContainsHarmonyBLSKeys * [test] added test TestCreateValidatorFromNewMsg * [test] fixed some tests errors * [test] added test TestUpdateValidatorFromEditMsg, last editted the test file, finished testing validator_test.go * [staking] added numeric.Dec.Copy method * [staking] added CommissionRates.Copy * [staking] add nil case handle to copy method and related test case * [test] added nil case for commissionRates.Copy test * [staking] finished CreateValidator.Copy and related test case * [staking] added EditValidator.Copy method and related test case * [test] added zero test cases for Copy method * [staking] implemented Delegate.Copy and related unit test case * [staking] added Undelegate.Copy and CollectReward.Copy method. Implemented corresponding test cases * [test] added two more simple unit tests * [test] solving the merge conflict with deep copy fix * [test] added schedule for sharding * [test] refactored double_sign_test.go * [test] comment out all test cases for now. * [test] added record Copy method for testing * [test] added the first test case in TestVerify * [test] finished test TestVerify * [test] Added test TestVerify, TestApplySlashRate, TestSetDifference * [test] half through TestDelegatorSlashApply * [test] fix the problem cause by unsafe usage of big.Int * [staking] added the copy methods to validatorWrapper * [test] added test cases for copy method for staking/validatorWrapper * [test] added test case TestApply * [test] added test case TestRate * [test] fix the golint errors * [test] removed commented out unit test code * [test] remote the empty line in imports * [test] moved copy methods to stake_testing module * [test] removed usage of interface stateDB * [test] removed empty lines in imports * [test] fixed golint package name issues * [test] removed a todo when writing code * [test] moved record.Copy to staking/slash/test * [test] add some changes * [test] added prototypes in staketest module * [test] fix the golint issue in staketest * [test] make prototype more beautiful * [test] refactored test TestCheckDuplicateFields * [test] add createValidator test data * [test] added positive test case for VerifyAndCreateValidatorFromMsg * [test] added create validator test * [test] added the positive test case for TestVerifyAndEditValidatorFromMsg * [test] added the tests case TestVerifyAndEditValidatorFromMsg * [test] fix one of the error is not triggered as expected * [test] more changes in test * [test] fix the positive test data for TestVerifyAndDelegateFromMsg * [test] Fixed two comment golint errors * [test] added delegate tests * [test] added a make function. WIP * [test] added undelegate positive test * [test] added negative test cases for undelegate * [test] added positive test. not passed. Need to add assert method in test suites * [test] added equal function to check Validator Equality * [test] added equals for staketest * [test] replaced deep equal with new equal methods: * [test] removed unused codes * [test] Finishing touch * [test] fix comment golint issue * [test] removed dead code in staking_verifier_test.go Co-authored-by: Ganesha Upadhyaya <ganeshrvce@gmail.com> * changed the sync port to dns port in flag * [network] Limit client sync connection (#3071) * [network] limit client connected peers * Changed signature and added tests * Set secure permissions on generated blskey pass file in node.sh * Fix spellin gtypo in node.sh * fix latest param handling in api v1 * added comment for the isGreaterThanLatestBlockNum check * fix a nil pointer crash due to previous revert Signed-off-by: Leo Chen <leo@harmony.one> * fix nil pointer crash Signed-off-by: Leo Chen <leo@harmony.one> * fix nil pointer of block Signed-off-by: Leo Chen <leo@harmony.one> * [rpc] add viewID and epoch to RPCMarshalBlock (#3009) * [rpc] add viewID and epoch to RPCMarshalBlock * add apt-get update * Do not rollback current block on failed block sync (#3101) Co-authored-by: Ganesha Upadhyaya <ganeshrvce@gmail.com> Co-authored-by: Rongjian Lan <rongjian.lan@gmail.com> Co-authored-by: Jacky Wang <jackyw.se@gmail.com> Co-authored-by: Janet Liang <56005637+janet-harmony@users.noreply.github.com> Co-authored-by: Daniel Van Der Maden <dvandermaden0@berkeley.edu> Co-authored-by: Janet Liang <janet@harmony.one> Co-authored-by: Sebastian Johnsson <sebastian.johnsson@gmail.com> Co-authored-by: hsiung <hsiung@pinterest.com> Co-authored-by: Dennis Won <jhwon0820@gmail.com> Co-authored-by: Yishuang Chen <34232522+ivorytowerdds@users.noreply.github.com>	5 years ago
Rongjian Lan	819500aa70	cherrypick log level change	5 years ago
Rongjian Lan	e85c1f3064	Fix log levels (#3058)	5 years ago
Leo Chen	2b25632219	Revert "[node] Throttle acceptance of incoming messages (#2970)" ... This reverts commit c2f089f618.	5 years ago
Rongjian Lan	3a32fedb1d	Fix commit payload (#2986) ... * Always use block data for commit payload * remove the misleading consensus.epoch * Fix lint and test * Remove consensus.String(); fix slash test	5 years ago
Edgar Aroutiounian	c2f089f618	[node] Throttle acceptance of incoming messages (#2970) ... * [node] Throttle acceptance of incoming messages * [p2p] Add sampled logger * [go.mod] Bump libs * [p2p][node] More sampled logs * [p2p] Disable auto relay, force public reachability, fix bandwidth reporter, enable NAT service * [p2p] Turn off some options * [node] Remove noisy and incorrect impl p2p log * [node] Sample bump to 24 second * [p2p] Remove linger of metric * [consenus] Fix race condition * [consensus] Race condition for grace period * [node] Less noisy closure * [node] Less noisy closure * [node] Bump context timeout on message, explicit cancel of context * [node] Cost back to 1 when reach threshold back of being fine * [node] Sync race condition * [node] toStart buf chan 1 * [p2p] Turn options on again * [node][p2p] Lower throttle point for test, remove noisy log, make time delay throttle small * [consensus] Fix nil pointer * [node] Remove noisy log, increase infrequency of Burst topic log * [blockchain] Nil pointer check * [node] Fix threshold, lessen log * [node] Bump throttle * [node] Nil to verify new block * [node] Keep threshold at half	5 years ago
Daniel Van Der Maden	451d16c14d	Add viewID to block signed content (#2877) ... * [consensus] Add ConstructCommitPayload for consensus signatures * [internal/engine] verify consensus sigs on hash+blockNum+viewID * [consensus] Add ConstructCommitPayload for consensus signatures * [internal/engine] verify consensus sigs on hash+blockNum+viewID * [consensus] verify consensus sigs on hash+blockNum+viewID * [node] verify consensus sigs for explorer on hash+blockNum+viewID * [crosslink] Add viewID & tie break by viewID last on sort * [api] Update crosslink constructor for viewID addition * [staking] Verify consensus sigs on hash+blockNum+viewID * [slash] update tests * [engine] Fix VerifyHeaderWithSignature commit signature payload * [crosslink] Make NewCrossLink return a pointer to CrossLink * [node] update ConstructCrossLinkMessage to reflect NewCrossLink change * [debug] Remove debugging logs	5 years ago
Edgar Aroutiounian	82b71619d2	[node] Redundant field removed - dead files & scripts , update deprecated libp2p package names, fold p2p code (#2817) ... * [project] Remove unused test script * [project] Remove stale testplan * [project] Remove stale test configs * [internal] Unused code * [node] Remove redundnat peer count field * [p2p] Remove leftover idea code, fix deprecated warnings * [project] Remove .gitmodule * [internal] Fix travis, update deprecated package usage * [node] Remove ineffective test * [p2p] Update deprecated package names & func usage * [p2p] Make error explicit, remove unidiomatic return signature * [p2p] Remove dead code, lower max p2p message size max limit * [project][p2p] Remove dead p2p code, fold all p2p code into one file * [p2p] Remove unsed function parameter * [node] Add log in bootstrap * [node] Unnecessary pointer usage * [p2p] Unused errors.go * [node] Log out when next consensus check in bootstrap	5 years ago
Rongjian Lan	e484b556ae	optimize leader signature collection strategy; Clean up logs (#2775) ... * Clean up logs * remove log * Refactor block period logic; wait for 100% sig before timeout * logic fixes * optimize now init * always wait for 2s for grace period	5 years ago
Rongjian Lan	40ea951ab5	Return if potential double sign	5 years ago
Rongjian Lan	eb54d32e2c	refactor slashing code and fix audit todos	5 years ago
Rongjian Lan	71361da6bd	more audit todos and fixes (#2489)	5 years ago
Rongjian Lan	84ffbcfb7a	[audit] Various fixes and todos for auditing; add log for collect rewards (#2448) ... * More logs and checks before processing staking txns * fix import * Refactor block proposal * Various fixes and todos for auditing; add log for collect rewards * Fix lint * fix comment	5 years ago
Edgar Aroutiounian	2baab4864c	[staking][validation][protocol] (#2396) ... * [staking][validation][protocol] Limit max bls keys * [staking-era] Fold banned and active into single field * [slash][effective] Remove LRU cache for slash, change .Active to enumeration * [slash] Remove leftover wrong usage of Logger * [slash][offchain] Only Decode if len > 0 * [offchain] cosmetic * [slash] Remove some logs in proposal * [webhook] Move webhook with call for when cannot commit block * [shard] Finally make finding subcommittee by shardID an explicit error * [node] Whitespace, prefer literal * [webhook] Report bad block to webhook * [slash] Expand verify, remove bad log usage, explicit error handle * [slash] Check on key size * [slash] Explicit upper bound of pending slashes * [slash] Use right epoch snapshot, fail to verify if epoch wrong on beaconchain * [multibls] Make max count allowed be 1/3 of external slots * [quorum] Remove bad API of ShardIDProvider, factor out committee key as method of committee * [verify] Begin factor out of common verification approach * [project] Further remove RawJSON log, use proper epoch for snapshot * [slash] Implement verification * [slash] Implement BLS key verification of ballots * [rpc] Keep validator information as meaningful as possible * [staking] Never can stop being banned * [slash] Comments and default Unknown case of eligibility * [slash] Be explicit on what input values allowed when want to change EPOSStatus * [consensus] Remove unneeded TODO * [verify] Add proper error message * [rpc] Give back to caller their wrong chain id * [chain] Add extra map dump of delegation sizing for downstream analysis * [engine] Less code, more methods * [offchain] More leniency in handling slash bytes and delete from pending * [validator] Remove errors on bad input for edit	5 years ago
Ganesha Upadhyaya	ae362c24c6	multi-bls key support (#2249) ... refactoring to multibls package to avoid cyclic dependency and better structure fixing import issue fixing more imports fixing a bug that causes nil pointer for explorer node fixing a bug in the super majority vote changing config to have same epoch for cross link and staking fixing the compilation error addressing PR comments leaving todo for assuming order between pub/pri keys pairs fixing goimports removing unwanted warning message	5 years ago
flicker-harmony	aadeae045c	Refactor explorer service and add addresses fetch from db	5 years ago
Edgar Aroutiounian	c4d744e376	[double-sign] Provide proof of double sign in slash record sent to beaconchain (#2253) ... * [double-sign] Commit changes in consensus needed for double-sign * [double-sign] Leader captures when valdator double signs, broadcasts to beaconchain * [slash] Add quick iteration tool for testing double-signing * [slash] Add webhook example * [slash] Add http server for hook to trigger double sign behavior * [double-sign] Use bin/trigger-double-sign to cause a double-sign * [double-sign] Full feedback loop working * [slash] Thread through the slash records in the block proposal step * [slash] Compute the slashing rate * [double-sign] Generalize yaml malicious for many keys * [double-sign][slash] Modify data structures, verify via webhook handler * [slash][double-sign] Find one address of bls public key signer, seemingly settle on data structures * [slash] Apply to state slashing for double signing * [slash][double-sign] Checkpoint for working code that slashes on beaconchain * [slash] Keep track of the total slash and total reporters reward * [slash] Dump account state before and after the slash * [slash] Satisfy Travis * [slash][state] Apply slash to the snapshot at beginning of epoch, now need to capture also the new delegates * [slash] Capture the unique new delegations since snapshot as well * [slash] Filter undelegation by epoch of double sign * [slash] Add TODO of correctness needed in slash needs on off-chain data * [rpc] Fix closure issue on shardID * [slash] Add delegator to double-sign testing script * [slash] Expand crt-validator.sh with commenting printfs and make delegation * [slash] Finish track payment of leftover slash debt after undelegation runs out * [slash] Now be explicit about error wrt delegatorSlashApply * [slash] Capture specific sanity check on slash paidoff * [slash] Track slash from undelegation piecemeal * [slash][delegation] Named slice types, .String() * [slash] Do no RLP encode twice, once is enough * [slash] Remove special case of validators own delegation * [slash] Refactor approach to slash state application * [slash] Begin expanding out Verify * [slash] Slash on snapshot delegations, not current * [slash] Fix Epoch Cmp * [slash] Third iteration on slash logic * [slash] Use full slash amount * [slash] More log, whitespace * [slash] Remove Println, add log * [slash] Remove debug Println * [slash] Add record in unit test * [slash] Build Validator snapshot, current. Fill out slash record * [slash] Need to get RLP dump of a header to use in test * [slash] Factor out double sign test constants * [slash] Factor out common for validator, stub out slash application, finish out deserialization setup * [slash] Factor out data structure creation because of var lexical scoping * [slash] Seem to have pipeline of unit test e2e executing * [slash] Add expected snitch, slash amounts * [slash] Checkpoint * [slash] Unit test correctly checks case of validator own stake which could drop below 1 ONE in slashing * [config] add double-sign testnet config (#1) Signed-off-by: Leo Chen <leo@harmony.one> * [slash] Commit for as is code & data of current dump.json * [slash] Order of state operation not correct in test, hence bad results, thank you dlv * [slash] Add snapshot state dump * [slash] Pay off slash of validator own delegation correctly * [slash] Pay off slash debt with special case for min-self * [slash] Pass first scenario conclusively * [slash] 2% slash passes unit test for own delegation and external * [slash] Parameterize unit test to easily test .02 vs .80 slash * [slash] Handle own delegation correctly at 80% slash * [slash] Have 80% slash working with external delegator * [slash] Remove debug code from slash * [slash] Adjust Apply signature, test again for 2% slash * [slash] Factor out scenario in testing so can test 2% and 80% at same time * [slash] Correct balance deduction on plan delegation * [slash] Mock out ChainReader for TestVerify * [slash] Small surface area interface, now feedback loop for verify * [slash] Remove development json * [slash] trigger-double-sign consumes yaml * [slash] Remove dead code * [slash][test] Factor ValidatorWrapper into scenario * [slash][test] Add example from local-testing dump - caution might be off * [slash] Factor out mutation of slashDebt * [slash][test] Factor out tests so can easily load test-case from bytes * [slash] Fix payment mistake in validator own delegation wrt min-self-delgation respected * [slash] Satisfy Travis * [slash] Begin cleanup of PR * [slash] Apply slash from header to Finalize via state processor * [slash] Productionize code, Println => logs; adjust slash picked in newblock * [slash] Need pointer for rlp.Decode * [slash] ValidatorInformation use full wrapper * Fix median stake * [staking] Adjust MarshalJSON for Validator, Wrapper * Refactor offchain data commit; Make block onchain/offchain commit atomic (#2279) * Refactor offchain data; Add epoch to ValidatorSnapshot * Make block onchain/offchain data commit atomically * [slash][committee] Set .Active to false on double sign, do not consider banned or inactive for committee assignment * [effective] VC eligible.go * [consensus] Redundant field in printf * [docker] import-ks for a dev account * [slash] Create BLS key for dockerfile and crt-validator.sh * [slash][docker] Easy deployment of double-sign testing * [docker] Have slash work as single docker command * [rpc] Fix median-stake RPC * [slash] Update webhook with default docker BLS key * [docker][slash] Fresh yaml copy for docker build, remove dev code in main.go * [slash] Remove helper binary, commented out code, change to local config * [params] Factor out test genesis value * Add shard checking to Tx-Pool & correct blacklist (#2301) * [core] Fix blacklist & add shardID check * [staking + node + cmd] Fix blacklist & add shardID check * [slash] Adjust to PR comments part 1 * [docker] Use different throw away funded account * [docker] Create easier testing for delegation with private keys * [docker] Update yaml * [slash] Remove special case for slashing validator own delegation wrt min-self-delegate * [docker] Install nano as well * [slash] Early error if banned * [quorum] Expose earning account in decider marshal json * Revert "Refactor offchain data commit; Make block onchain/offchain commit atomic (#2279)" This reverts commit 9ffbf682c0. * [slash] Add non-sanity check way to update validator * [reward] Increase percision on percentage in schedule * [slash] Adjust logs * [committee] Check eligibility of validator before doing sanity check * [slash] Update docker * [slash] Move create validator script to test * [slash] More log * [param] Make things faster * [slash][off-chain] Clear out slashes from pending in writeblockwithstate * [cross-link] Log is not error, just info * [blockchain] Not necessary to guard DeletePendingSlashingCandidates * [slash][consensus] Use plain []byte for signature b/c bls.Sign has private impl fields, rlp does not encode that * [slash][test] Use faucet as sender, assume user imported * [slash] Test setup * [slash] reserve error for real error in logs * [slash][availability] Apply availability correct, bump signing count each block * [slash][staking] Consider banned field in sanity check, pay snitch only half of what was actually slashed * [slash] Pay as much as can * [slash] use right nowAmt * [slash] Take away from rewards as well * [slash] iterate faster * [slash] Remove dev based timing * [slash] Add more log, sanity check incoming slash records, only count external for slash rate * [availability][state] Adjust signature of ValidatorWrapper wrt state, filter out for staked validators, correct availaibility measure on running counters * [availability] More log * [slash] Simply pre slash erra slashing * [slash] Remove development code * [slash] Use height from recvMsg, todo on epoch * [staking] Not necessary to touch LastEpochInCommittee in staking_verifier * [slash] Undo ds in endpoint pattern config * [slash] Add TODO and log when delegation becomes 0 b/c slash debt payment * [slash] Abstract staked validators from shard.State into type, set slash rate based BLSKey count Co-authored-by: Leo Chen <leo@harmony.one> Co-authored-by: flicker-harmony <52401354+flicker-harmony@users.noreply.github.com> Co-authored-by: Rongjian Lan <rongjian@harmony.one> Co-authored-by: Daniel Van Der Maden <daniel@harmony.one>	5 years ago
Edgar Aroutiounian	59859250f1	[consensus] Remove unnecessary usage of bandwidth in network messages… (#2226) ... * [consensus] Remove unnecessary usage of bandwidth in network messages, small adjustments after consensus code review * [consensus] Factor out behavior of when quorum prepare reached * [consensus] Push code from another scratch branch * [consensus] Still do need to accept higher than blocknum message	5 years ago
Edgar Aroutiounian	801b4b83e2	[slash][consensus] Notice double sign & broadcast, factor out tech debt of consensus (#2152) ... * [slash] Remove dead interface, associated piping * [slash] Expand out structs * [consensus] Write to a chan when find a case of double-signing, remove dead code * [slash] Broadcast the noticing of a double signing * [rawdb] CRUD for slashing candidates * [slashing][node][proto] Broadcast the slash record after receive from consensus, handle received proto message, persist in off-chain db while pending * [slash][node][propose-block] Add verified slashes proposed into the header in block proposal * [slash][shard] Factor out external validator as method on shard state, add double-signature field * [slash][engine] Apply slash, name boolean expression for sorts, use stable sort * [slash] Abstract Ballot results so keep track of both pre and post double sign event * [slash] Fix type errors on test code * [slash] Read from correct rawdb * [slash] Add epoch based guards in CRUD of slashing * [slash] Write to correct cache for slashing candidates * [shard] Use explicit named type of BLS Signature, use convention * [slash] Fix mistake done in refactor, improper header used. Factor out fromSlice to set * [slash][node] Restore newblock to master, try again minimial change * [cx-receipts] Break up one-liner, use SliceStable, not Slice * [network] Finish refactor that makes network message headers once * [network] Simplify creation further of headers write * [slash] Adjust data structure of slash after offline discussion with RJ, Chao * [slash] Still did need signature of the double signature * [consensus] Prepare message does not have block header * [consensus] Soft reset three files to 968517d~1 * [consensus] Begin factor consensus network intended message out with prepare first * [consensus] Factor out Prepared message * [consensus] Factor out announce message creation * [consensus] Committed Message, branch on verify sender key for clearer log * [consensus] Committed Message Factor out * [consensus] Do jenkins MVP of signatures adjustment * [main][slash] Provide YAML config as webhook config for double sign event * [consensus] Adjust signatures, whitespace, lessen GC pressure * [consensus] Remove dead code * [consensus] Factor out commit overloaded message, give commit payload override in construct * [consensus] Fix travis tests * [consensus] Provide block bytes in SubmitVote(quorum.Commit) * [consensus] Factor out noisy sanity checks in BFT, move existing commit check earlier as was before * [quorum] Adjust signatures in quorum * [staking] Adjust after merge from master * [consensus] Finish refactor of consensus * [node] Fix import * [consensus] Fix travis * [consensus] Use origin/master copy of block, fix mistake of pointer to empty byte * [consensus] Less verbose bools * [consensus] Remove unused trailing mutation hook in message construct * [consensus] Address some TODOs on err, comment out double sign	5 years ago