Singer Pur
type: MusicGroup
genre: choral
genre: medieval
description: Singer Pur is a German vocal sextet founded in 1991 by former members of the Regensburger Domspatzen. The five original members were joined by a soprano in 1994. The sextet is focussed on classical mu
popularity: 18
followers: 2234
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x45cc438a7f44c07e28813c773c2ac1956ce611b517aa2b29c8a1e370e4bb2015
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953660
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953660
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/53bfca74-c22a-420d-a51e-9f2db533efb4.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/53bfca74-c22a-420d-a51e-9f2db533efb4.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/53bfca74-c22a-420d-a51e-9f2db533efb4
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T17:20:01Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x45cc438a7f44c07e28813c773c2ac1956ce611b517aa2b29c8a1e370e4bb2015","name":"Singer Pur","registered_at":"2026-06-14T13:11:59Z","symbol":"NIM0463405","token_address":"0x6ec913749b6c7550fc92c984d0dd8ab886bf5694","type":"artist","uuid":"53bfca74-c22a-420d-a51e-9f2db533efb4"}
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 0x45cc438a7f44c07e28813c773c2ac1956ce611b517aa2b29c8a1e370e4bb2015. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/53bfca74-c22a-420d-a51e-9f2db533efb4.json and https://artists.proofprofile.net/proofs/artist/53bfca74-c22a-420d-a51e-9f2db533efb4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T17:20:01Z
  text: {"copyright_id":"0x45cc438a7f44c07e28813c773c2ac1956ce611b517aa2b29c8a1e370e4bb2015","name":"Singer Pur","registered_at":"2026-06-14T13:11:59Z","symbol":"NIM0463405","token_address":"0x6ec913749b6c7550fc92c984d0dd8ab886bf5694","type":"artist","uuid":"53bfca74-c22a-420d-a51e-9f2db533efb4"}
album: Moralia & Harmoniae morales
  type: MusicAlbum
  date published: 2000