Callum Au
type: MusicGroup
genre: big band
genre: vocal jazz
popularity: 15
followers: 695
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xec31cbae0e1144eb39b5355331b5ee46d3d41fed07c2b3cdf41c26e317ab633a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953742
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953742
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/81af8183-9741-4ba1-8c3e-73652f4f93ce.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/81af8183-9741-4ba1-8c3e-73652f4f93ce.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/81af8183-9741-4ba1-8c3e-73652f4f93ce
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T04:47:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xec31cbae0e1144eb39b5355331b5ee46d3d41fed07c2b3cdf41c26e317ab633a","name":"Callum Au","registered_at":"2026-06-14T18:04:47Z","symbol":"NIM0533241","token_address":"0xad4b21ab8ecb91e946f14d292fde0e636dd9084b","type":"artist","uuid":"81af8183-9741-4ba1-8c3e-73652f4f93ce"}
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 0xec31cbae0e1144eb39b5355331b5ee46d3d41fed07c2b3cdf41c26e317ab633a. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81af8183-9741-4ba1-8c3e-73652f4f93ce.json and https://artists.proofprofile.net/proofs/artist/81af8183-9741-4ba1-8c3e-73652f4f93ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T04:47:56Z
  text: {"copyright_id":"0xec31cbae0e1144eb39b5355331b5ee46d3d41fed07c2b3cdf41c26e317ab633a","name":"Callum Au","registered_at":"2026-06-14T18:04:47Z","symbol":"NIM0533241","token_address":"0xad4b21ab8ecb91e946f14d292fde0e636dd9084b","type":"artist","uuid":"81af8183-9741-4ba1-8c3e-73652f4f93ce"}
album: I Get Along Without You Very Well
  type: MusicAlbum
  date published: 2020-04-24
album: You and the Night and the Music
  type: MusicAlbum
  date published: 2020-05-15
album: I Concentrate on You
  type: MusicAlbum
  date published: 2020-06-05
album: Songs and Stories
  type: MusicAlbum
  date published: 2020-06-26
  track: You and the Night and the Music
    type: MusicRecording
    duration: PT2M56S
    duration ms: 176826
    explicit: false
    by artist: Callum Au
    in album: Songs and Stories
      type: MusicAlbum
      date published: 2020-06-26
    genre: big band
    genre: vocal jazz
    isrc code: DKBDB2001611
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-21T03:38:25+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xcf8c21c74a510ef8171cc27e3aae31f561b8e5de77f638c9813ba3ba140d120c
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958959
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958959
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKBDB2001611
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T03:51:22Z
    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 0xcf8c21c74a510ef8171cc27e3aae31f561b8e5de77f638c9813ba3ba140d120c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/DKBDB2001611.
      date published: 2026-07-21T03:51:22Z
    audio: You and the Night and the Music
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 131.975
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.692
      additional property: Energy
        type: PropertyValue
        value: 0.712
      additional property: Speechiness
        type: PropertyValue
        value: 0.047
      additional property: Acousticness
        type: PropertyValue
        value: 0.253
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.042
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.688
      additional property: Loudness (dB)
        type: PropertyValue
        value: -5.895
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: I Feel Pretty
  type: MusicAlbum
  date published: 2023-03-24
  track: I Feel Pretty
    type: MusicRecording
    duration: PT6M40S
    duration ms: 400159
    explicit: false
    by artist: Callum Au
    in album: I Feel Pretty
      type: MusicAlbum
      date published: 2023-03-24
    genre: big band
    genre: vocal jazz
    isrc code: USCGJ2379170
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-21T08:00:17+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x2748a1475d15be9583fe14a13b2ff3c1dfc77190fe038d3e73d51c9085efe179
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958985
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958985
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ2379170
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T08:39:15Z
    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 0x2748a1475d15be9583fe14a13b2ff3c1dfc77190fe038d3e73d51c9085efe179. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USCGJ2379170.
      date published: 2026-07-21T08:39:15Z
    audio: I Feel Pretty
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 109.855
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.547
      additional property: Energy
        type: PropertyValue
        value: 0.547
      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
album: How Long Has This Been Going On?
album: Louis & Cal’s Ultimate Big Band Toolkit, Vol. 2

Speechiness
type: PropertyValue
value: 0.053

Acousticness
type: PropertyValue
value: 0.032

Instrumentalness
type: PropertyValue
value: 0.747

Liveness
type: PropertyValue
value: 0.115

Valence (Positivity)
type: PropertyValue
value: 0.618

Loudness (dB)
type: PropertyValue
value: -10.842

Key Name
type: PropertyValue
value: F

Mode Name
type: PropertyValue
value: Minor

How Long Has This Been Going On?
type: MusicAlbum
date published: 2023-07-22

Louis & Cal’s Ultimate Big Band Toolkit, Vol. 2
type: MusicAlbum
date published: 2023-12-16