Bengt Ollén
type: MusicGroup
description: Bengt Ollén (born 17 August 1950) is a Swedish choral conductor, music teacher, adjudicator and lecturer. In 1995 Ollén founded Sofia Vokalensemble that has emerged as one of the world's leading amate
popularity: 3
followers: 10
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd3b7bb489274f02e0453d0b8e657f74298393531d70d4733b359aae3e81164a9
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954603
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954603
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c1e5b4d2-0fa3-499e-b76a-d0f632a186fd.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c1e5b4d2-0fa3-499e-b76a-d0f632a186fd.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c1e5b4d2-0fa3-499e-b76a-d0f632a186fd
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T21:47:54Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd3b7bb489274f02e0453d0b8e657f74298393531d70d4733b359aae3e81164a9","name":"Bengt Ollén","registered_at":"2026-06-20T19:24:38Z","symbol":"NIM1693886","token_address":"0xd37110eba158974d8641ffc9c5c0b67447752e7d","type":"artist","uuid":"c1e5b4d2-0fa3-499e-b76a-d0f632a186fd"}
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 0xd3b7bb489274f02e0453d0b8e657f74298393531d70d4733b359aae3e81164a9. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1e5b4d2-0fa3-499e-b76a-d0f632a186fd.json and https://artists.proofprofile.net/proofs/artist/c1e5b4d2-0fa3-499e-b76a-d0f632a186fd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T21:47:54Z
  text: {"copyright_id":"0xd3b7bb489274f02e0453d0b8e657f74298393531d70d4733b359aae3e81164a9","name":"Bengt Ollén","registered_at":"2026-06-20T19:24:38Z","symbol":"NIM1693886","token_address":"0xd37110eba158974d8641ffc9c5c0b67447752e7d","type":"artist","uuid":"c1e5b4d2-0fa3-499e-b76a-d0f632a186fd"}