Practice program — a tutorial (testnet)
A tutorial whose bug and proof are public: anyone can run a try on testnet, with no account and no key.
Practice program: a tutorialOpenround 0light-client confirmedrecorded run, 2026-11-04
Overview
The program as near-antibody stores it. Its manifest hash commits the anchor, the targets, the rules and the terms; once it is open, the deployment's owner can change nothing it depends on.
- Project
- antibody.testnet, account: antibody.testnet · ours
- Description
TUTORIAL TARGET: 24 vaults with one textbook bug (sweep has no access check), published with its proof (docs/practice.md).
as written in the committed manifest- Program key
- bounty.
antibody. testnet/6, program key: bounty.antibody.testnet/6 - Phase
- Open round 0this round since
- Created
- 99uBeRv7…, NEAR transaction: 99uBeRv7HFCpARobTcwdRu2MBW6PJhANtVZpwLdvtFfh, opens an explorer in a new tab
- Opened
- 3gdnQrPH…, NEAR transaction: 3gdnQrPHBNRuiRdNCWgasKVn5qgQvxLfo6bNrwXdybxQ, opens an explorer in a new tab
- Terms sha256
- 2a714747a7fe11e7…, terms sha256: 2a714747a7fe11e7c534424ec7c9f9b2baca7cb04928aa3aa3b69c32aeffae67
- Manifest sha256
- e275b02e2cb1d88f…, manifest sha256: e275b02e2cb1d88f47b51c2a93ea71a0ae8ba43851d3d6b262bfb690aca5b347Uploaded in NEAR transaction DTXZYpH5Lp…, NEAR transaction: DTXZYpH5Lp51qtCdYkJgPLjBucHmM7zeuPhxqXhtAcJd, opens an explorer in a new tab by antibody.testnet
- Sealing key
- ea66fa087c57c5b3…, sealing public key: ea66fa087c57c5b32066c97a9791b0c1d5cfa2e96db22ea33cc693d0a91b764fProofs are sealed to it. It counts only once its activation run (run 52) is attested on NEAR: BnH55CpC…, NEAR transaction: BnH55CpC9ew1bCWRkoVM8femdKyDMN8axJyvmc4Q7tFd, opens an explorer in a new tab
Its record
- At stake
- 0.0202wNEAR available now
- Verified attempts
- 12
- Paid findings
- 10
- First claim
- 47 safter it opened
- Claimed in the first hour
- 6.66%of the escrow
- Open for
- 120.8 h
view bounty.
Holds if: the manifest hash shown here, as near-antibody stores it
antibody judge --program 6Try it
A tutorial: its bug and its proof are public. Anyone can run the whole loop on testnet in a few minutes, with no account and no key; nothing here is a real vulnerability.
One rule, one textbook bug
Each of 24 small vaults holds a little ether, and its sweep(to) has no access check: anyone can send a vault's ether anywhere. The proof is one call to your vault; at the anchor the vault loses its ether, so vault_keeps_its_ether breaks. Each vault is its own target, so each try is its own finding.
antibody try --name <you>The browser try and the CLI use the practice vending contract's program, program 14.
What a try does
- Vends you a practice account for a key your browser (or the CLI) generates; the key cannot withdraw or transfer.
- Builds the tutorial proof against the vault assigned to you, seals it to the program's key, commits and reveals it.
- Waits for the verdict and its attestation on NEAR.
- Allocates and pays (both permissionless), then closes the practice account: its NEAR goes back to the vending contract.
The payout goes to the vending contract's credit, which pays the next try's bond and run.
The rules as code
Each rule is one bit of the program's invariants contract. After a proof's calls, at the anchor, the verifier runs its check(): a set bit is a broken rule, paid by its severity. The verifier never reads a report.
| Rule | Severity | Payout | Budget per round | Source |
|---|---|---|---|---|
vault_keeps_its_etherbit 0 No practice vault loses its ether. | Low | 0.001 wNEAR | 0.03 wNEAR |
The budget caps what one rule pays per round, so many entry points into one root cause cannot drain the escrow. A finding's key is the rule and the entry point that broke it (by default, the target and function): the first proof of each key is paid.
The targets (25) on Sepolia
- factory0x3811928b…a3d3, factory address: 0x3811928b0cf5326adcd7d1937e645835d130a3d3, opens an explorer in a new tab
- vault-00xa7b45e6d…654e, vault-0 address: 0xa7b45e6d1e7d9f488e219e273836d17f9489654e, opens an explorer in a new tab
- vault-10x90c1b227…c811, vault-1 address: 0x90c1b2271452a26b58b612467f0b25f102d6c811, opens an explorer in a new tab
- vault-20x43689b96…a6cd, vault-2 address: 0x43689b969e15fe77db867266edc2e028f3c6a6cd, opens an explorer in a new tab
- vault-30xce0e5e7b…edd5, vault-3 address: 0xce0e5e7be89913778ee2250f6e51da4e1bbeedd5, opens an explorer in a new tab
- vault-40x185d4f6a…e56a, vault-4 address: 0x185d4f6a747091760f39adbe66a3a414ce8fe56a, opens an explorer in a new tab
- vault-50x3c93d9ef…c1c1, vault-5 address: 0x3c93d9efa9322b7e61f1203eeb02ae6f105dc1c1, opens an explorer in a new tab
- vault-60xec83ccd2…91a9, vault-6 address: 0xec83ccd28e904b9773aea89d66d06cd614a491a9, opens an explorer in a new tab
- vault-70xc321c950…ebd9, vault-7 address: 0xc321c95007818fd00f74b8ac2099a00267ecebd9, opens an explorer in a new tab
- vault-80x48f155b1…bf76, vault-8 address: 0x48f155b18bd0fdce9e73c018dbec32fbf5e2bf76, opens an explorer in a new tab
- vault-90x5ed35bd3…5b94, vault-9 address: 0x5ed35bd3e2586aa3ea288b9dd72e5093496e5b94, opens an explorer in a new tab
- vault-100x8aecbf27…a8b6, vault-10 address: 0x8aecbf2766de14405a1ff69978cac08b8c61a8b6, opens an explorer in a new tab
- vault-110x3fdcf28f…340a, vault-11 address: 0x3fdcf28f87c8d5214517f3775bd588f79416340a, opens an explorer in a new tab
- vault-120xc7eb957e…3594, vault-12 address: 0xc7eb957ea47c1bfef6260465d5d9018532423594, opens an explorer in a new tab
- vault-130xb37f3f2c…5684, vault-13 address: 0xb37f3f2cae77ddce3e3d55fc04ba2ba373885684, opens an explorer in a new tab
- vault-140xfe8c0d8f…2071, vault-14 address: 0xfe8c0d8fed4d283d3d5c5d36bb75141da8fc2071, opens an explorer in a new tab
- vault-150x012849ff…9ea6, vault-15 address: 0x012849ff2ab346fef70a86f2923b45d5c0cc9ea6, opens an explorer in a new tab
- vault-160x51e66035…90b7, vault-16 address: 0x51e660357de82b8fb6e33af6cca7f24ad04a90b7, opens an explorer in a new tab
- vault-170xe0f9e4ab…8669, vault-17 address: 0xe0f9e4abcd980c94a86f4ceec61d73b3adef8669, opens an explorer in a new tab
- vault-180xa828ec08…44b9, vault-18 address: 0xa828ec08588df5b71c5a027bac2bbb68ddc844b9, opens an explorer in a new tab
- vault-190x83cb21ef…9ae4, vault-19 address: 0x83cb21ef40d1b7f7eb895818513163180ed19ae4, opens an explorer in a new tab
- vault-200x27bce7d1…3a7c, vault-20 address: 0x27bce7d176b7103fc76b37a2f44706cb7f9b3a7c, opens an explorer in a new tab
- vault-210x198b8abf…652f, vault-21 address: 0x198b8abf4fb07d9fb7074012e5227b5106ee652f, opens an explorer in a new tab
- vault-220x40c8ae46…2f72, vault-22 address: 0x40c8ae46d71df902c8e7f3e5681ab67a4fed2f72, opens an explorer in a new tab
- vault-230x6712ab45…734a, vault-23 address: 0x6712ab453c36edaac5d19cb147dd68c67608734a, opens an explorer in a new tab
The terms
Committed in the manifest with the rules, their text fixed by the terms sha256, and enforced by near-antibody: no person decides a payout.
Payouts
| Severity | Payout | Rules |
|---|---|---|
| Critical | none | none |
| High | none | none |
| Medium | none | none |
| Low | 0.001 wNEAR | vault_keeps_its_ether |
- Bond per commit
- 0.0001 wNEAR · refunded, or forfeited to this program's escrow when the proof breaks nothing
- Instant payments
- up to 0.001 wNEAR
When a payout is instant
Paid in seconds when the verdict is attested on NEAR, within 0.024 wNEAR per 1 h. Otherwise a payout waits the challenge window; above the cap it also needs an agreeing second run.
- Challenge bond
- 0.001 wNEAR
- Protocol fee
- none · pinned at 0 for this program
- Release fee
- none · pinned at 0 for this program
- Verification deposit
- 0.03 NEAR per run, paid by whoever asks for it; OutLayer refunds the unused part
The escrow against the largest payout
20.2×the largest payout
0.0202 available / 0.001 wNEAR largestThe available escrow over the largest payout. Below 1× the status page raises an alert; a payout the escrow cannot cover is queued as debt, in commit order.
- Pauses
- No rule pauses anything.
- Known issues
- None allowed.
- Gap lane
- Off.
- Unevaluable
- A proof the rules cannot evaluate (check() reverts or runs out of gas) is refunded.
The windows
| Window | Length | What it bounds |
|---|---|---|
Reveal | 10 min | A commit is revealed within this, or it expires and its bond goes to the escrow. |
Challenge window | 60 s | A verdict that is not paid instantly is final after this; anyone may challenge it within it, with the challenge bond. |
Resolve | 5 min | A challenge with no attested result within this voids the verdict; both bonds are refunded. |
Run timeout | 4 min | A run that never answered is void after this. |
Infrastructure grace | 10 min | An infrastructure failure is retried this long, then the commit closes with a refund. |
Round minimum | 2 min | A round runs at least this long before the next one opens. |
Re-run window | 10 min | Re-runs at a proposed fix may be asked for within this of its confirmed check. |
Disclosure delay | 10 min | A paid proof becomes public at most this long after its claim. |
Exit grace | 60 s | After the deadline plus this, anyone may settle the program (exit). |
Deadline | No commit is accepted after it. |
The anchor
Every proof runs on the state proven at one block. A pause ticket, and the verdict guard, act only on an anchor the light client confirmed: on a project-attested anchor a verdict is about state the project chose.
- Chain
- Sepolia (11155111)
- Block
- 12063269 (opens an explorer)
- Hash
- 0x16662a318858fe75ac73c5ffc61dd184b0069ce90148470fff821b16d373f2c2
- Its check
- confirmed by the light clientnear-antibody compared the hash with client-eth2.sepolia.testnet when the program was created.anchor_checked (LightClient): 99uBeRv7…, NEAR transaction: 99uBeRv7HFCpARobTcwdRu2MBW6PJhANtVZpwLdvtFfh, opens an explorer in a new tab
- Base witness
- The anchor state the rules and the round-0 checks read, proven against the anchor and pinned at activation.bed565c109e123dd…, base witness sha256: bed565c109e123ddc1b7bce134e15bd8ad95a1bed94d3f6fd2a631e05ab0ed39Uploaded in NEAR transaction Hzdxw2Ai4x…, NEAR transaction: Hzdxw2Ai4xCwEmMgfL3ktdvkNTMG5Ym6yC644wzYLZmq, opens an explorer in a new tab by antibody.testnet
Check the hash yourself
view client-eth2.sepolia.testnet.block_hash_safe(12063269 as 8 little-endian bytes: 0x2512b80000000000)
Expected: byte 0 is 1 (the client holds the block), then 32 bytes equal to the anchor hash.
The same check from a terminal, and the one that also hashes the block header from a Sepolia RPC:
antibody judge --program 6antibody anchor-check --block 12063269Known issues
Declared sealed before open; a later proof with the same tag is not paid again. Their count, rules and severities are public; their content stays sealed for good.
0 sealed
No known issue declared: every key this program prices was open to the first proof.
The chains
Per chain: the program's adapter, the proxies it may pause or upgrade, and every permit near-guardian asked the MPC network to sign, with the transaction that carried it there.
No chains: a practice program pauses nothing and ships no fix. Its proofs are verified and paid; no permit is ever asked for.
The tries
Every proof committed to this tutorial, practice tries labelled as such: who, when, the state, the verdict and the payout; never the proof.
1 with a zero-knowledge proof
| Commit | Who | When | State | Verdict | Keys | Payout |
|---|---|---|---|---|---|---|
Commit 20#0 · round 0 | judge-1-p6. | Paid | ViolationAttested on NEARZero-knowledge proof | vault_keeps_its_ethercc52c19a…, tag of vault_keeps_its_ether: cc52c19a12305290fa0b15741d08f4ec325bacf4242cdef37f4b153e13c33e51 | ||
Commit 21#1 · round 0 | judge-2-p6. | Paid | ViolationAttested on NEAR | vault_keeps_its_ether799a12eb…, tag of vault_keeps_its_ether: 799a12eb298b584978405584ad1c7e40b7dfe278333a7b29b13815821ddb75b1 | ||
Commit 23#2 · round 0 | pcs-rehearsal. | Paid | ViolationAttested on NEAR | vault_keeps_its_ether9990e991…, tag of vault_keeps_its_ether: 9990e991d8bcee767113d2bfb18a2100da8db6f5f1be40db08339fb7ce91453c | ||
Commit 24#3 · round 0 | judge-lrb2. | Paid | ViolationAttested on NEAR | vault_keeps_its_ether3d033ead…, tag of vault_keeps_its_ether: 3d033ead15c63a63185e5b4535711b803aeb7bc41a65009f713c584be316f78b | ||
Commit 25#4 · round 0 | site-check. | Paid | ViolationAttested on NEAR | vault_keeps_its_ether3819758f…, tag of vault_keeps_its_ether: 3819758f5bf9959a08ac811a8848d42799527427ce06f861e61e8c225c68e906 | ||
Commit 26#5 · round 0 | cli-check-t0. | Paid | ViolationAttested on NEAR | vault_keeps_its_ether8f7cd6c8…, tag of vault_keeps_its_ether: 8f7cd6c86c1bedbfffcd681acd957641755c479f48eb7b6e75a02dcedbe5f35d | ||
Commit 27#6 · round 0 | byo-alpha. | Paid | ViolationAttested on NEAR | vault_keeps_its_ether94f9aa81…, tag of vault_keeps_its_ether: 94f9aa81ba1a5a2316e0c856a2a2d5dd498aff858bd921a91909ff8dd50f49c3 | ||
Commit 28#7 · round 0 | byo-beta. | Paid | ViolationAttested on NEAR | vault_keeps_its_ether8be58560…, tag of vault_keeps_its_ether: 8be585601aa3caa6b91f5701ead5e7b232fa0c11f6b95ec69bec3196b5997421 | ||
Commit 29#8 · round 0 | byo-wrong. | No violation · bond forfeited | No violationAttested on NEAR | no rule broken | — | |
Commit 30#9 · round 0 | byo-invalid. | No violation · bond forfeited | InvalidPoCAttested on NEAR | no rule broken | — | |
Commit 31#10 · round 0 | rel-linux-check. | Paid | ViolationEnclave verdict | vault_keeps_its_etherb1831ae6…, tag of vault_keeps_its_ether: b1831ae630301d8ff80e357f3cab1488ed6df2af4be300868bb17ebf78df9d14 | ||
Commit 32#11 · round 0 | scrn-k7q2-1107. | Paid | ViolationEnclave verdict | vault_keeps_its_ether0dcba24f…, tag of vault_keeps_its_ether: 0dcba24fe1693d9b35e78967d7a6817a02325aceaa5eacc697209bab8692800a |
A key is a rule and the entry point that broke it: the first proof of each key is paid; a later one is a duplicate that keeps its own proof record. Each commit's page shows its proof card and how to check it.
antibody status --program 6Rounds and the release gate
A round ships a fix as code overrides at the same anchor. The enclave checks it, every paid proof is re-run against it, and a release permit is signed only for code that every paid proof fails against.
No round yet: this program still runs its round-0 code. A round is how a fix ships, and only a fix every paid proof fails against is released.
The ledger
Every movement of the escrow keeps funded equal to available + reserved + paid + fees + returned. Amounts in wNEAR, which has no value on testnet.
balances
Where the escrow is
| Available | 0.0202 |
|---|---|
| Reserved | 0.0000 |
| Paid | 0.0100 |
| Fees | 0.0000 |
| Returned | 0.0000 |
| Funded | 0.0302 |
What came in
| Deposits | 0.0300 |
|---|---|
| Forfeited bonds | 0.0002 |
| Challenge bonds | 0.0000 |
| Funded | 0.0302 |
Forfeited bonds go to this program's escrow, where they pay future findings: never to us. Here, 0.0002 wNEAR came in that way.
The audit
- Accounted
- 0.0302
- Reservations
- 0 · held by the commits; equals reserved when it balances
- Debt
- 0 · owed and not yet funded, queued in commit order
- Defaulted
- 0
view bounty.
Holds if: ok: true (funded equals accounted, and reserved equals the commits' reservations)
antibody view --contract bounty.antibody.testnet --method audit --args '{"program_id":6}'