Jaap Schröder
type: MusicGroup
genre: classical
description: Jaap Schröder (31 December 1925 – 1 January 2020)Dutch violinist and musicologist Jaap Schröder dies aged 94 was a Dutch violinist, conductor, and pedagogue. He studied at the Amsterdam Conservatory
popularity: 23
followers: 518
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x57da4876920f87784865f4b6f95e1248b1d519b6cd0439ba4d4ea9cc5ad462f6
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8e6b497a-70a5-40f1-b055-dde44688541f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8e6b497a-70a5-40f1-b055-dde44688541f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/8e6b497a-70a5-40f1-b055-dde44688541f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x57da4876920f87784865f4b6f95e1248b1d519b6cd0439ba4d4ea9cc5ad462f6","name":"Jaap Schröder","registered_at":"2026-06-12T04:12:07Z","symbol":"NIM0183166","token_address":"0xf39929c356cd25f37d0c2172d6309b7b751d3702","type":"artist","uuid":"8e6b497a-70a5-40f1-b055-dde44688541f"}
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 0x57da4876920f87784865f4b6f95e1248b1d519b6cd0439ba4d4ea9cc5ad462f6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e6b497a-70a5-40f1-b055-dde44688541f.json and https://artists.proofprofile.net/proofs/artist/8e6b497a-70a5-40f1-b055-dde44688541f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-12T19:24:56Z
  text: {"copyright_id":"0x57da4876920f87784865f4b6f95e1248b1d519b6cd0439ba4d4ea9cc5ad462f6","name":"Jaap Schröder","registered_at":"2026-06-12T04:12:07Z","symbol":"NIM0183166","token_address":"0xf39929c356cd25f37d0c2172d6309b7b751d3702","type":"artist","uuid":"8e6b497a-70a5-40f1-b055-dde44688541f"}
album: Concerto Grosso No. 6 In E Minor
  type: MusicAlbum
  date published: 2023-07-14
album: Vermeer a Bologna
  type: MusicAlbum
  date published: 2014
track: Concerto for 2 Violins, Strings, and Continuo in D minor, BWV 1043: 2. Largo ma non tanto
  type: MusicRecording
  duration: PT6M44S
  duration ms: 404053
  explicit: false
  by artist: Johann Sebastian Bach
  by artist: Jaap Schröder
  by artist: Christopher Hirons
  by artist: Academy of Ancient Music
  by artist: Christopher Hogwood
  in album: The World of The Academy of Ancient Music
    type: MusicAlbum
    date published: 2001-01-13
  popularity: 7
  genre: classical
  genre: classical-piano
  genre: early-music
  genre: baroque
  genre: chamber-music
  genre: concerto
  isrc code: GBF078100122
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x7b3f511b37143ef269cd7d19293204908b4fea21a7cc35c461cdac1f48bd5f51
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 959123
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/959123
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078100122
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-22T11:35:32Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3f511b37143ef269cd7d19293204908b4fea21a7cc35c461cdac1f48bd5f51. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078100122 — a six-check JSON result.
    date published: 2026-07-22T11:35:32Z
  audio: Concerto for 2 Violins, Strings, and Continuo in D minor, BWV 1043: 2. Largo ma non tanto
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 72.24
    additional property: Musical Key
      type: PropertyValue
      value: 1
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.086
    additional property: Energy
      type: PropertyValue
      value: 0.088
    additional property: Speechiness
      type: PropertyValue
      value: 0.053
    additional property: Acousticness
      type: PropertyValue
      value: 0.808
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.074
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.066
    additional property: Loudness (dB)
      type: PropertyValue
      value: -22.422
    additional property: Key Name
      type: PropertyValue
      value: C#
    additional property: Mode Name
      type: PropertyValue
      value: Minor
track: Symphony No. 35 In D, K.385 "Haffner": 4. Finale (Presto)
  type: MusicRecording
  duration: PT3M54S
  duration ms: 234973
  explicit: false
  by artist: Wolfgang Amadeus Mozart
  by artist: Academy of Ancient Music
  by artist: Jaap Schröder
  by artist: Christopher Hogwood
  in album: The World of The Academy of Ancient Music
    type: MusicAlbum
    date published: 2001-01-13
  popularity: 5
  genre: classical
  genre: classical-era
  genre: classical-piano
  genre: opera
  genre: chamber-music
  genre: concerto
  isrc code: GBF077913065
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-06T07:04:48+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xb8ee4e558b8d2715cdbfbf8c43674e37dc5b6fb7b0472b561be0019682c30f97
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 957075
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957075
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077913065
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-07T18:50:38Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ee4e558b8d2715cdbfbf8c43674e37dc5b6fb7b0472b561be0019682c30f97. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077913065 — a six-check JSON result.
    date published: 2026-07-07T18:50:38Z
  audio: Symphony No. 35 In D, K.385 "Haffner": 4. Finale (Presto)
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 144.638
    additional property: Musical Key
      type: PropertyValue
      value: 9
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
    additional property: Danceability
    additional property: Energy
    additional property: Speechiness
    additional property: Acousticness
    additional property: Instrumentalness
    additional property: Liveness
    additional property: Valence (Positivity)
    additional property: Loudness (dB)
    additional property: Key Name
    additional property: Mode Name

Time Signature
type: PropertyValue
value: 5

Danceability
type: PropertyValue
value: 0.361

Energy
type: PropertyValue
value: 0.271

Speechiness
type: PropertyValue
value: 0.048

Acousticness
type: PropertyValue
value: 0.806

Instrumentalness
type: PropertyValue
value: 0.171

Liveness
type: PropertyValue
value: 0.093

Valence (Positivity)
type: PropertyValue
value: 0.369

Loudness (dB)
type: PropertyValue
value: -21.571

Key Name
type: PropertyValue
value: A

Mode Name
type: PropertyValue
value: Major