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Security

Ossification

Ossification measures how battle-tested the code securing a project is: the share of recorded code-bug exploits (published, onchain-verified dataset) whose exploited code was younger than the project's critical contracts are today. The clock starts at the ossification genesis, and every critical change resets it. Battle-tested exposure is the value they secured over the unchanged period.
TVS & changes (1Y)
1
Uniswap V2 logo
Uniswap V2
Uniswap V2
DeFi
99
4 May 2020
$13.23 B·yearsTVL (source: DefiLlama)
0
across 3 contracts
N/A
2
Uniswap V3 logo
Uniswap V3
Uniswap V3
DeFi
98
4 May 2021
$12.27 B·yearsTVL (source: DefiLlama)
0
across 4 contracts
N/A
3
Tornado Cash logo
Tornado Cash
Tornado Cash
Privacy
98
2 Apr 2021
$2.63 B·years
0
across 21 contracts
4
Safe logo
Safe
Safe
DeFi
98
25 May 2021
N/A
0
across 12 contracts
N/A
5
Privacy Pools v1 logo
Privacy Pools v1
Privacy Pools v1
Privacy
84
22 May 2025
$6.35 M·years
1.2
across 17 contracts
6
Celo logo
Celo
Celo
Layer 2
73
26 May 2026
$113.95 M·years
8.1
across 24 contracts
7
Railgun logo
Railgun
Railgun
Privacy
61
14 Aug 2026
$21.88 M·years
0.7
across 8 contracts
8
Arbitrum One logo
Arbitrum One
Arbitrum One
Layer 2
59
31 Aug 2026
$1.90 B·years
5.3
across 52 contracts
9
Mantle logo
Mantle
Mantle
Layer 2
54
17 Sep 2026
$183.60 M·years
4.3
across 16 contracts
10
OP Mainnet logo
OP Mainnet
OP Mainnet
Layer 2
52
24 Sep 2026
$210.31 M·years
7.0
across 23 contracts
11
Ink logo
Ink
Ink
Layer 2
52
24 Sep 2026
$43.73 M·years
7.3
across 24 contracts
12
Morph logo
Morph
Morph
Layer 2
52
22 Sep 2026
$18.68 M·years
12
across 18 contracts
13
Unichain logo
Unichain
Unichain
Layer 2
52
24 Sep 2026
$9.95 M·years
8.0
across 24 contracts
14
Scroll logo
Scroll
Scroll
Layer 2
52
22 Sep 2026
$5.14 M·years
9.0
across 56 contracts
15
Katana logo
Katana
Katana
Layer 2
50
30 Sep 2026
$5.01 M·years
21
across 34 contracts
16
zkAPI logo
zkAPI
zkAPI
Privacy
50
30 Sep 2026
$188.24·years
0
across 3 contracts
17
Base Chain logo
Base Chain
Base Chain
Layer 2
46
7 Oct 2026
$1.15 B·years
8.3
across 24 contracts
18
Linea logo
Linea
Linea
Layer 2
46
8 Oct 2026
$25.38 M·years
9.3
across 18 contracts
19
Starknet logo
Starknet
Starknet
Layer 2
43
14 Oct 2026
$25.23 M·years
13
across 48 contracts
20
Aztec Network v6 logo
Aztec Network v6
Aztec Network v6
Layer 2
33
26 Oct 2026
$5.74·years
0
across 13 contracts
21
zk.money logo
zk.money
zk.money
Privacy
33
26 Oct 2026
N/A
0
across 16 contracts
22
Taiko Alethia logo
Taiko Alethia
Taiko Alethia
Layer 2
32
27 Oct 2026
$233.82 K·years
28
across 46 contracts
23
ZKsync Era logo
ZKsync Era
ZKsync Era
Layer 2
27
30 Oct 2026
$3.12 M·years
15
across 36 contracts
24
Lighter logo
Lighter
Lighter
Layer 2
22
1 Nov 2026
$8.01 M·years
34
across 5 contracts