Umbrtka
type: MusicGroup
genre: avant-garde
genre: black metal
description: Umbrtka is a metal band from Plzeň, Czech Republic. The band describe their music, which incorporates black, doom, industrial metal elements and is influenced by Czech underground, as 'grey' metal. Th
popularity: 2
followers: 1166
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6921cf10592a5bc56112abce87c37df898c8739cdbb6a5e5acbfd5c7c5d80661
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953911
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953911
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/18e7f628-9d76-4ecd-a0e6-837f38fd55ff.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/18e7f628-9d76-4ecd-a0e6-837f38fd55ff.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/18e7f628-9d76-4ecd-a0e6-837f38fd55ff
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T08:03:10Z
additional property: OTSCanonicalRecord
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6921cf10592a5bc56112abce87c37df898c8739cdbb6a5e5acbfd5c7c5d80661. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18e7f628-9d76-4ecd-a0e6-837f38fd55ff.json and https://artists.proofprofile.net/proofs/artist/18e7f628-9d76-4ecd-a0e6-837f38fd55ff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T20:07:57Z
album: Pane / Uhelna Paneu
  type: MusicAlbum
  date published: 2010-01-15
album: Uplna Demontaz Lidstva
  type: MusicAlbum
  date published: 2010-01-15