Dolf Brouwers
type: MusicGroup
genre: nederpop
description: thumb|right|250px|Dolf Brouwers as Sjef van Oekel Dolf Brouwers (31 August 1912 – 23 September 1997) was a Dutch comedian, singer, and television actor who rose to fame late in life playing the charac
popularity: 6
followers: 477
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additional property: CopyrightChainExplorerURL
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  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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81dab240d77c15bab56cbd323cb5ea6197c0cf15944d96f2afe8a9b55096a6c. 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/a53961a9-3d92-452a-ac4a-048fa5d83873.json and https://artists.proofprofile.net/proofs/artist/a53961a9-3d92-452a-ac4a-048fa5d83873.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-20T08:57:02Z
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album: Ga Nooit Weg Zonder Te Groeten
  type: MusicAlbum
  date published: 1963-08-08
album: Tulpen Uit De Tuin
  type: MusicAlbum
  date published: 1989
album: Weet Je Nog, 40 Liedjes Die Je Nooit Vergeet
  type: MusicAlbum
  date published: 1995-10-05
album: Hollands Glorie-Dolf Brouwers
  type: MusicAlbum
  date published: 2006-06-19
  track: Goedemorgen
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    duration: PT3M17S
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    by artist: Dolf Brouwers
    in album: Hollands Glorie-Dolf Brouwers
      type: MusicAlbum
      date published: 2006-06-19
    genre: nederpop
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    additional property: OTSVerificationAPI
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      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA240605166
    additional property: OTSTimestamp
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    additional property: OTSVerifyInstructions
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      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
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      date published: 2026-07-05T01:12:41Z
    audio: Goedemorgen
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      additional property: Danceability
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      additional property: Valence (Positivity)
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      additional property: Loudness (dB)
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      additional property: Key Name
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        value: C
      additional property: Mode Name
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