Marcus Rojas
type: MusicGroup
description: Marcus Rojas (born February 23, 1963) is an American tubist from New York City. Early life Rojas was born in New York City on February 23, 1963, and grew up in Red Hook, Brooklyn. His early influence
popularity: 9
followers: 164
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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 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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  date published: 2026-06-21T11:50:32Z
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track: Black and Tan Fantasy
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  by artist: Paolo Fresu
  by artist: Steven Bernstein
  by artist: Gianluca Petrella
  by artist: Marcus Rojas
  in album: Brass Bang!
    type: MusicAlbum
    date published: 2014-11-11
  genre: jazz-trumpet
  genre: italian-contemporary-jazz
  genre: italian-jazz
  isrc code: ITZ681400238
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  additional property: OTSVerifyInstructions
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    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
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5f657be81cec3506f860e0c4dd9202f88b24a29eedcf62986506db71d7ba99. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ITZ681400238.
    date published: 2026-07-30T03:35:13Z
  audio: Black and Tan Fantasy
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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    additional property: Key Name
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    additional property: Mode Name
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track: No potho reposare
  type: MusicRecording
  duration: PT4M36S
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  by artist: Paolo Fresu
  by artist: Steven Bernstein
  by artist: Gianluca Petrella
  by artist: Marcus Rojas
  in album: Brass Bang!
    type: MusicAlbum
    date published: 2014-11-11
  genre: jazz-trumpet
  genre: italian-contemporary-jazz
  genre: italian-jazz
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  additional property: OTSVerifyInstructions
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    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
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    date published: 2026-07-31T21:25:57Z
  audio: No potho reposare
    type: AudioObject
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    additional property: Danceability
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    additional property: Acousticness
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    additional property: Instrumentalness
    additional property: Liveness
    additional property: Valence (Positivity)
    additional property: Loudness (dB)
    additional property: Key Name
    additional property: Mode Name

Instrumentalness
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value: 0.919

Liveness
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value: 0.108

Valence (Positivity)
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value: 0.194

Loudness (dB)
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value: -20.402

Key Name
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value: Eb

Mode Name
type: PropertyValue
value: Major