Ark-0
Ark-0 is a test network for trying things out. It may be reset at any time.

Block 18780

Hash
000000f2cbd637aa400c262789c01a92a5a401c9d14b672eaaa6039eef7c15dd
Confirmations
23533
Time
2026-10-09 18:31:00 UTC
Median time
2026-10-09 18:22:23 UTC
Transactions
1
Size
2,772
Weight
10,980
Difficulty
0.0035089589
Bits
1e011cfb
Merkle root
6d0880bb2f9d08a546f4e572ebeec77df3764c3db5fb69311ca990448a36df64
Previous block
00000003cc99f22eb498e9dd9869a012e4039adb39b5e7d03b541887d012ce0b
Next block
000000bac18505d92390aa2282caf0d3db848cc41cfcbc63dec231fd243645fe

ML-DSA-44 block signature (M2)

M2 is an experimental rule of this test network. From a height set in its build, a node that enforces M2 accepts a block only if, besides the classical signet signature, the block carries a valid ML-DSA-44 signature by the Ark-0 block key, in its coinbase's witness commitment output. This page shows that signature; it does not check it.

Block 18780 is below the activation height 20000: nodes do not require this signature, and only log the result of checking it when run with -debug=validation. The block producer adds it from height 18000 on, so that nodes can check it before it is required.

Status
In the form M2 requires, followed by the signet solution push (the classical signature)
Signature
c677383063ada896dc7eec32f60bd01c… (2420 B)
Format version
0x01
Context string
SIGNET/PQBLOCK/EXP0
Block key the nodes require
SHA-256 eee8548f51f25492de3ae430b7ce7ec549edfaa663b8f577f026ce0498fdd6ad

Transactions

txidInputsOutputsAmountFee
6d0880bb2f9d…90448a36df64 coinbase1250