Der harte Kern
type: MusicGroup
genre: polka
popularity: 6
followers: 262
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xcc673d61bc9fbf95b5a1828fcda8a3989b9c335c44d0ef1ce7b1875851dc7d46
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954533
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954533
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a416fc4d-a8e9-41ff-bee3-425507eb1eaa.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a416fc4d-a8e9-41ff-bee3-425507eb1eaa.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a416fc4d-a8e9-41ff-bee3-425507eb1eaa
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T08:57:02Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xcc673d61bc9fbf95b5a1828fcda8a3989b9c335c44d0ef1ce7b1875851dc7d46","name":"Der harte Kern","registered_at":"2026-06-20T06:49:27Z","symbol":"NIM1545746","token_address":"0x12838a02bb59e35f5f0c8bc94fb3e26a6094dc61","type":"artist","uuid":"a416fc4d-a8e9-41ff-bee3-425507eb1eaa"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc673d61bc9fbf95b5a1828fcda8a3989b9c335c44d0ef1ce7b1875851dc7d46. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a416fc4d-a8e9-41ff-bee3-425507eb1eaa.json and https://artists.proofprofile.net/proofs/artist/a416fc4d-a8e9-41ff-bee3-425507eb1eaa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T08:57:02Z
  text: {"copyright_id":"0xcc673d61bc9fbf95b5a1828fcda8a3989b9c335c44d0ef1ce7b1875851dc7d46","name":"Der harte Kern","registered_at":"2026-06-20T06:49:27Z","symbol":"NIM1545746","token_address":"0x12838a02bb59e35f5f0c8bc94fb3e26a6094dc61","type":"artist","uuid":"a416fc4d-a8e9-41ff-bee3-425507eb1eaa"}
album: 10 Jahre
  type: MusicAlbum
  date published: 2002-01-01
album: 100 Jahre Gottlieb Weissbacher
  type: MusicAlbum
  date published: 2007-10-21
album: 20 Jahre
  type: MusicAlbum
  date published: 2011-10-19
album: 30 Jahre der harte Kern
  type: MusicAlbum
  date published: 2023-02-24