Hélène Mercier
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genre: classical
genre: classical piano
popularity: 30
followers: 655
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additional property: OTSVerifyInstructions
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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
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a1f17dc6063008f629f6e34b5cd70f21cf4688efe63707577a45e2897a4f9d. 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/2d9850e0-a183-42db-92ae-75acf58a9378.json and https://artists.proofprofile.net/proofs/artist/2d9850e0-a183-42db-92ae-75acf58a9378.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
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album: Lost to the World
  type: MusicAlbum
  date published: 2026-03-06
track: Mathieu / Arr. Wastor: Concertino No. 2, Op. 13: II. Andante
track: Mathieu / Arr. Wastor: Concertino No. 2, Op. 13: III. Mathieu / Arr. Wastor: Concertino No. 2: II. Allegro

Mathieu / Arr. Wastor: Concertino No. 2, Op. 13: II. Andante
type: MusicRecording
duration: PT5M42S
duration ms: 342680
explicit: false
by artist: André Mathieu
by artist: Alain Lefèvre
by artist: Hélène Mercier
in album: Mathieu: Concerto de Québec & Works for 2 Pianos
  type: MusicAlbum
  date published: 2020-02-14
isrc code: GBAYC1901518
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additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:39:04Z
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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ea5784d14b35467bb638dac170deadedd53a57d7d7f08a69c0a585b7a84d6f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBAYC1901518.
  date published: 2026-07-08T03:39:04Z
audio: Mathieu / Arr. Wastor: Concertino No. 2, Op. 13: II. Andante
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  additional property: Danceability
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -29.94
  additional property: Key Name
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    value: Eb
  additional property: Mode Name
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Mathieu / Arr. Wastor: Concertino No. 2, Op. 13: III. Mathieu / Arr. Wastor: Concertino No. 2: II. Allegro
type: MusicRecording
duration: PT4M25S
duration ms: 265920
explicit: false
by artist: André Mathieu
by artist: Alain Lefèvre
by artist: Hélène Mercier
in album: Mathieu: Concerto de Québec & Works for 2 Pianos
  type: MusicAlbum
  date published: 2020-02-14
isrc code: GBAYC1901519
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additional property: OTSTimestamp
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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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
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subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3192b88ea39d6473d4cb370654a3b1fad2304c7b71e2aafec1d14f582fdbfe95. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBAYC1901519.
  date published: 2026-07-08T08:56:20Z
audio: Mathieu / Arr. Wastor: Concertino No. 2, Op. 13: III. Mathieu / Arr. Wastor: Concertino No. 2: II. Allegro
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