Marcel Vogel
type: MusicGroup
description: Marcel Joseph Vogel (April 14, 1917 – February 12, 1991) was a research scientist working at the IBM San Jose Research Center for 27 years. He is sometimes referred to as Dr. Vogel, although this titl
popularity: 21
followers: 3639
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x95079eb58756dac7957a951952e6b9e131d759f33f174b537ac7ea9b363e394e
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/a0351f2a-0c7b-43bf-84ae-cc5bf3814064.ots
additional property: OTSRecordURL
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  value: https://artists.proofprofile.net/proofs/artist/a0351f2a-0c7b-43bf-84ae-cc5bf3814064.json
additional property: OTSVerificationAPI
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a0351f2a-0c7b-43bf-84ae-cc5bf3814064
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95079eb58756dac7957a951952e6b9e131d759f33f174b537ac7ea9b363e394e. 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/a0351f2a-0c7b-43bf-84ae-cc5bf3814064.json and https://artists.proofprofile.net/proofs/artist/a0351f2a-0c7b-43bf-84ae-cc5bf3814064.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
  text: {"copyright_id":"0x95079eb58756dac7957a951952e6b9e131d759f33f174b537ac7ea9b363e394e","name":"Marcel Vogel","registered_at":"2026-06-12T05:59:07Z","symbol":"NIM0207763","token_address":"0xa43cecd0a21d9b78109b1418f5804087593f08ef","type":"artist","uuid":"a0351f2a-0c7b-43bf-84ae-cc5bf3814064"}
album: Body to Body
  type: MusicAlbum
  date published: 2015-01-09
album: Body to Body
  type: MusicAlbum
  date published: 2015-01-09
album: Doin It
  type: MusicAlbum
  date published: 2015-02-13
album: Doin' It
  type: MusicAlbum
  date published: 2015-02-13
album: Human Being
  type: MusicAlbum
  date published: 2016-09-09
album: Human Being
  type: MusicAlbum
  date published: 2016-09-09
album: Moonchild
  type: MusicAlbum
  date published: 2017-04-07
album: Moonchild (Remixes)
  type: MusicAlbum
  date published: 2017-04-07
album: I Got Jesus
  type: MusicAlbum
  date published: 2017-04-10
  track: I Got Jesus - Karizma Dub
    type: MusicRecording
    duration: PT7M47S
    duration ms: 467692
    explicit: false
    by artist: Marcel Vogel
    in album: I Got Jesus
      type: MusicAlbum
      date published: 2017-04-10
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    additional property: CopyrightID
    additional property: CopyrightStatus
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      value: registered
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      type: PropertyValue
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    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1728677
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T11:41:42Z
    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 0x1f040a22e5fadf67d3519209292c546c79b8fe32a37e3bb388aefb7bd31144b8. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1728677.
      date published: 2026-07-21T11:41:42Z
    audio: I Got Jesus - Karizma Dub
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        value: 116.99
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        value: 6
      additional property: Mode (Major/Minor)
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      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.662
      additional property: Energy
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      additional property: Speechiness
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      additional property: Instrumentalness
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      additional property: Liveness
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      additional property: Valence (Positivity)
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      additional property: Loudness (dB)
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album: I Got Jesus
  type: MusicAlbum
  date published: 2017-04-24
album: Dance The Blues Away
  type: MusicAlbum
  date published: 2018-02-26
album: Dance The Blues Away
  type: MusicAlbum
  date published: 2018-03-12
album: Brown Curls
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  date published: 2018-04-23
album: Brown Curls
  type: MusicAlbum
  date published: 2018-04-30
album: If You Like
  type: MusicAlbum
  date published: 2018-07-02
album: If You Like
  type: MusicAlbum
  date published: 2018-07-16
album: Marcel Vogel's Lumberjacks in Hell
  type: MusicAlbum
  date published: 2018-09-28
album: The Sound of Lumberjacks in Hell
  type: MusicAlbum
  date published: 2018-09-28
album: Fuck The Bass Up
  type: MusicAlbum
  date published: 2019-05-21
album: Fuck The Bass Up
  type: MusicAlbum
  date published: 2019-05-31
album: Take Me Back
  type: MusicAlbum
  date published: 2020-09-07
  track: Take Me Back
    type: MusicRecording
    duration: PT4M46S
    duration ms: 286392
    explicit: false
    by artist: Marcel Vogel
    in album: Take Me Back
      type: MusicAlbum
      date published: 2020-09-07
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      type: PropertyValue
      value: registered
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      type: PropertyValue
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    additional property: CopyrightChainExplorerURL
    additional property: OTSHash
    additional property: OTSBitcoinBlock
    additional property: OTSBitcoinBlockVerifyURL
    additional property: OTSVerificationAPI
    additional property: OTSTimestamp
    additional property: OTSVerifyInstructions
    subject of: OpenTimestamps Proof of Existence
    audio: Take Me Back
album: If You Don't Love
album: This Is When I Leave
album: Why Don't You Leave Me
album: Like A Fish In The Water
album: Head Back in the Game
album: Keep on Stepping
album: Games Change
album: Free Time
album: No Time
album: Just Because (LYMA Remix)
album: Just Because (Stefan Ringer Remix)
album: Just Because (Remixes)
album: Keep The Lid On
track: Jail - Marcel Vogel Remix
track: Corre Caminos - Marcel Vogel Happy Edit

CopyrightChainExplorerURL
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value: https://explorer.copyrightchains.com/tx/0xcdc1810cd0c63fd1b1eec7d1d0609f2d3d8124516aba33937ee2cc02339a0ae3

OTSHash
type: PropertyValue

OTSBitcoinBlock
type: PropertyValue
value: 956440

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/956440

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB7FY2020020

OTSTimestamp
type: PropertyValue
value: 2026-07-03T04:03:57Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc1810cd0c63fd1b1eec7d1d0609f2d3d8124516aba33937ee2cc02339a0ae3. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB7FY2020020.
date published: 2026-07-03T04:03:57Z

Take Me Back
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 119.595
additional property: Musical Key
  type: PropertyValue
  value: 6
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 0
additional property: Time Signature
  type: PropertyValue
  value: 4
additional property: Danceability
  type: PropertyValue
  value: 0.852
additional property: Energy
  type: PropertyValue
  value: 0.632
additional property: Speechiness
  type: PropertyValue
  value: 0.078
additional property: Acousticness
  type: PropertyValue
  value: 0.001
additional property: Instrumentalness
  type: PropertyValue
  value: 0.119
additional property: Liveness
  type: PropertyValue
  value: 0.055
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.494
additional property: Loudness (dB)
  type: PropertyValue
  value: -9.442
additional property: Key Name
  type: PropertyValue
  value: F#
additional property: Mode Name
  type: PropertyValue
  value: Minor

If You Don't Love
type: MusicAlbum
date published: 2021-10-08

This Is When I Leave
type: MusicAlbum
date published: 2021-10-15

Why Don't You Leave Me
type: MusicAlbum
date published: 2021-10-29

Like A Fish In The Water
type: MusicAlbum
date published: 2021-11-05

If You Don't Love
type: MusicAlbum
date published: 2021-11-19

Head Back in the Game
type: MusicAlbum
date published: 2022-11-18

Head Back in the Game
type: MusicAlbum
date published: 2022-11-18

Keep on Stepping
type: MusicAlbum
date published: 2023-02-17

Keep on Stepping
type: MusicAlbum
date published: 2023-02-17

Games Change
type: MusicAlbum
date published: 2023-03-24

Games Change
type: MusicAlbum
date published: 2023-03-24
track: Funk Money
  type: MusicRecording
  duration: PT4M35S
  duration ms: 275937
  explicit: false
  by artist: Marcel Vogel
  in album: Games Change
    type: MusicAlbum
    date published: 2023-03-24
  isrc code: NLQ7C2200029
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-04T00:22:14+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x26feb43b40f242c8de05016d36fbd9843cd5850864e06a91c120c152c0619e42
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956634
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956634
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ7C2200029
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-04T10:04:33Z
  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 0x26feb43b40f242c8de05016d36fbd9843cd5850864e06a91c120c152c0619e42. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ7C2200029.
    date published: 2026-07-04T10:04:33Z
  audio: Funk Money
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 114.987
    additional property: Musical Key
      type: PropertyValue
      value: 7
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.821
    additional property: Energy
      type: PropertyValue
      value: 0.66
    additional property: Speechiness
      type: PropertyValue
      value: 0.042
    additional property: Acousticness
      type: PropertyValue
      value: 0.138
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.196
    additional property: Liveness
      type: PropertyValue
      value: 0.658
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.842
    additional property: Loudness (dB)
      type: PropertyValue
      value: -7.79
    additional property: Key Name
      type: PropertyValue
      value: G
    additional property: Mode Name
      type: PropertyValue
      value: Major

Free Time
type: MusicAlbum
date published: 2023-07-07

Free Time
type: MusicAlbum
date published: 2023-07-07

No Time
type: MusicAlbum
date published: 2023-08-18

No Time
type: MusicAlbum
date published: 2023-08-18

Just Because (LYMA Remix)
type: MusicAlbum
date published: 2025-03-14
track: Just Because - LYMA Remix
  type: MusicRecording
  duration: PT6M28S
  duration ms: 388134
  explicit: false
  by artist: Marcel Vogel
  in album: Just Because (LYMA Remix)
    type: MusicAlbum
    date published: 2025-03-14
  isrc code: DEG932500594
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-15T13:01:27+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xa38a18ef7730f96ae646b8982719e43ba0e554b3abf27995bb72cb240c8c7f26
  additional property: OTSHash
  additional property: OTSBitcoinBlock
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  additional property: OTSBitcoinBlockVerifyURL
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    value: https://blockstream.info/api/block-height/958157
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEG932500594
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-15T13:14:32Z
  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 0xa38a18ef7730f96ae646b8982719e43ba0e554b3abf27995bb72cb240c8c7f26. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEG932500594.
    date published: 2026-07-15T13:14:32Z
  audio: Just Because - LYMA Remix
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 125.015
    additional property: Musical Key
      type: PropertyValue
      value: 7
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.835
    additional property: Energy
      type: PropertyValue
      value: 0.485
    additional property: Speechiness
      type: PropertyValue
      value: 0.062
    additional property: Acousticness
      type: PropertyValue
      value: 0.005
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.027
    additional property: Liveness
      type: PropertyValue
      value: 0.054
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.903
    additional property: Loudness (dB)
      type: PropertyValue
      value: -8.592
    additional property: Key Name
      type: PropertyValue
      value: G
    additional property: Mode Name
      type: PropertyValue
      value: Minor

Just Because (Stefan Ringer Remix)
type: MusicAlbum
date published: 2025-04-11
track: Just Because - Stefan Ringer Remix
  type: MusicRecording
  duration: PT5M36S
  duration ms: 336997
  explicit: false
  by artist: Marcel Vogel
  in album: Just Because (Stefan Ringer Remix)
    type: MusicAlbum
    date published: 2025-04-11
  isrc code: DEG932500595
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-18T22:49:05+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xfe2c83debe067fb4258d573916f8e14d9c1dff80d8e4980b3c589d11a35e0077
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958621
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958621
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEG932500595
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-18T22:59:44Z
  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 0xfe2c83debe067fb4258d573916f8e14d9c1dff80d8e4980b3c589d11a35e0077. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEG932500595.
    date published: 2026-07-18T22:59:44Z
  audio: Just Because - Stefan Ringer Remix
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
      type: PropertyValue
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    additional property: Mode (Major/Minor)
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      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.736
    additional property: Energy
      type: PropertyValue
      value: 0.812
    additional property: Speechiness
      type: PropertyValue
      value: 0.042
    additional property: Acousticness
      type: PropertyValue
      value: 0.005
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.01
    additional property: Liveness
      type: PropertyValue
      value: 0.087
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.668
    additional property: Loudness (dB)
      type: PropertyValue
      value: -10.16
    additional property: Key Name
      type: PropertyValue
      value: Bb
    additional property: Mode Name
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Just Because (Remixes)
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Keep The Lid On
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    date published: 2026-07-20T01:04:02Z
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Jail - Marcel Vogel Remix
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subject of: OpenTimestamps Proof of Existence
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audio: Jail - Marcel Vogel Remix
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Corre Caminos - Marcel Vogel Happy Edit
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by artist: Marcel Vogel
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subject of: OpenTimestamps Proof of Existence
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