Katrin Melcher
type: MusicGroup
genre: chamber music
popularity: 2
followers: 106
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x13a59df4a98b0a89f31583ff6840a08d6be5bf0ef4f0cbe44b3afa19dea1c2b7
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/904da77e-6962-466b-b437-bfc1be2ac3c3.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/904da77e-6962-466b-b437-bfc1be2ac3c3.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/904da77e-6962-466b-b437-bfc1be2ac3c3
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x13a59df4a98b0a89f31583ff6840a08d6be5bf0ef4f0cbe44b3afa19dea1c2b7","name":"Katrin Melcher","registered_at":"2026-06-17T16:01:40Z","symbol":"NIM1446392","token_address":"0x01e2ff6fa41c2f7cc42b14220cf5cdbc380f7aad","type":"artist","uuid":"904da77e-6962-466b-b437-bfc1be2ac3c3"}
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 0x13a59df4a98b0a89f31583ff6840a08d6be5bf0ef4f0cbe44b3afa19dea1c2b7. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/904da77e-6962-466b-b437-bfc1be2ac3c3.json and https://artists.proofprofile.net/proofs/artist/904da77e-6962-466b-b437-bfc1be2ac3c3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0x13a59df4a98b0a89f31583ff6840a08d6be5bf0ef4f0cbe44b3afa19dea1c2b7","name":"Katrin Melcher","registered_at":"2026-06-17T16:01:40Z","symbol":"NIM1446392","token_address":"0x01e2ff6fa41c2f7cc42b14220cf5cdbc380f7aad","type":"artist","uuid":"904da77e-6962-466b-b437-bfc1be2ac3c3"}
album: Duos for Viola and Violoncello
  type: MusicAlbum
  date published: 2012
  track: Partita: Pavane
    type: MusicRecording
    duration: PT2M34S
    duration ms: 154202
    explicit: false
    by artist: Julian Milone
    by artist: Katrin Melcher
    by artist: Martin Ostertag
    in album: Duos for Viola and Violoncello
      type: MusicAlbum
      date published: 2012
    popularity: 0
    isrc code: DEX991250812
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-06T10:14:28+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x32fd7f7b51b249aaa2f50d5b3028f7fea17e706a5d49a3e84365d97fb319d5a7
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 957067
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/957067
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEX991250812
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-07T16:54:37Z
    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 0x32fd7f7b51b249aaa2f50d5b3028f7fea17e706a5d49a3e84365d97fb319d5a7. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/DEX991250812.
      date published: 2026-07-07T16:54:37Z
    audio: Partita: Pavane
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 113.426
      additional property: Musical Key
        type: PropertyValue
        value: 4
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.237
      additional property: Energy
        type: PropertyValue
        value: 0.027
      additional property: Speechiness
        type: PropertyValue
        value: 0.05
      additional property: Acousticness
        type: PropertyValue
        value: 0.989
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.952
      additional property: Liveness
        type: PropertyValue
        value: 0.121
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.082
      additional property: Loudness (dB)
        type: PropertyValue
        value: -30.409
      additional property: Key Name
        type: PropertyValue
        value: E
      additional property: Mode Name
        type: PropertyValue
        value: Minor
  track: Duet mit zwei obligaten Augengläsern in E-Flat Major, WoO 32 "Eyeglass Duo"
    type: MusicRecording
    duration: PT8M50S
    duration ms: 530982
    explicit: false
    by artist: Ludwig van Beethoven
    by artist: Katrin Melcher
    by artist: Martin Ostertag
    in album: Duos for Viola and Violoncello
      type: MusicAlbum
      date published: 2012
    popularity: 2
    genre: classical
    genre: classical-piano
    genre: chamber-music
    isrc code: DEX991250818
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-31T00:26:07+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x40cf0493fa0a2b91ebb99fe1482b4da2991aa693afb8cf6dfffc4de567c7d32e
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960334
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960334
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEX991250818
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-31T02:19:15Z
    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 0x40cf0493fa0a2b91ebb99fe1482b4da2991aa693afb8cf6dfffc4de567c7d32e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEX991250818.
      date published: 2026-07-31T02:19:15Z
    audio: Duet mit zwei obligaten Augengläsern in E-Flat Major, WoO 32 "Eyeglass Duo"
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 136.792
      additional property: Musical Key
        type: PropertyValue
        value: 3
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.405
      additional property: Energy
        type: PropertyValue
        value: 0.11
      additional property: Speechiness
        type: PropertyValue
        value: 0.04
      additional property: Acousticness
        type: PropertyValue
        value: 0.983
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name

Instrumentalness
type: PropertyValue
value: 0.783

Liveness
type: PropertyValue
value: 0.12

Valence (Positivity)
type: PropertyValue
value: 0.488

Loudness (dB)
type: PropertyValue
value: -25.212

Key Name
type: PropertyValue
value: Eb

Mode Name
type: PropertyValue
value: Major