Umbra
type: MusicGroup
genre: spoken word
popularity: 20
followers: 801
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x534bfe82a86ab8f158f6077dac8ac4f30b91e6c2736f6c791b5b02b3e7ebacb2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953778
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953778
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cd491798-070c-4a43-ad51-4c581d3f8b50.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cd491798-070c-4a43-ad51-4c581d3f8b50.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/cd491798-070c-4a43-ad51-4c581d3f8b50
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T11:57:35Z
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 0x534bfe82a86ab8f158f6077dac8ac4f30b91e6c2736f6c791b5b02b3e7ebacb2. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd491798-070c-4a43-ad51-4c581d3f8b50.json and https://artists.proofprofile.net/proofs/artist/cd491798-070c-4a43-ad51-4c581d3f8b50.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T11:57:35Z
album: Úr myrkrinu
  type: MusicAlbum
  date published: 2018-10-24
album: Úr myrkrinu
  type: MusicAlbum
  date published: 2018-10-24
album: Úr myrkrinu / Out of Darkness
  type: MusicAlbum
  date published: 2018-10-24
album: Sólhvörf / Solstitium
  type: MusicAlbum
  date published: 2019-02-06
album: Sólhvörf / Solstitium
  type: MusicAlbum
  date published: 2019-02-06
album: Sólhvörf
  type: MusicAlbum
  date published: 2019-02-06
album: LLIBRE VERMELL / Maríusöngvar frá miðöldum
  type: MusicAlbum
  date published: 2019-12-06
album: Llibre vermell
  type: MusicAlbum
  date published: 2019-12-06
album: Jólatíð / Yuletide
  type: MusicAlbum
  date published: 2021-12-01
album: Stóðum tvö í túni
  type: MusicAlbum
  date published: 2022-04-08
album: Bjargrúnir
  type: MusicAlbum
  date published: 2022-05-01
album: Bjargrúnir
  type: MusicAlbum
  date published: 2022-05-06