1721 Project
type: MusicGroup
genre: tango
popularity: 7
followers: 101
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xaaaa20aa6f1cedadf5bd437d1a9f0d8b9c041cfe86ee1d333e4abc29a0066234
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/85dce920-19e8-4449-9084-a13a97de6928.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/85dce920-19e8-4449-9084-a13a97de6928.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/85dce920-19e8-4449-9084-a13a97de6928
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xaaaa20aa6f1cedadf5bd437d1a9f0d8b9c041cfe86ee1d333e4abc29a0066234","name":"1721 Project","registered_at":"2026-06-17T12:16:51Z","symbol":"NIM1392814","token_address":"0x7fa5c90980240ba986f3b7fa602faba94a0c8270","type":"artist","uuid":"85dce920-19e8-4449-9084-a13a97de6928"}
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 0xaaaa20aa6f1cedadf5bd437d1a9f0d8b9c041cfe86ee1d333e4abc29a0066234. 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/85dce920-19e8-4449-9084-a13a97de6928.json and https://artists.proofprofile.net/proofs/artist/85dce920-19e8-4449-9084-a13a97de6928.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0xaaaa20aa6f1cedadf5bd437d1a9f0d8b9c041cfe86ee1d333e4abc29a0066234","name":"1721 Project","registered_at":"2026-06-17T12:16:51Z","symbol":"NIM1392814","token_address":"0x7fa5c90980240ba986f3b7fa602faba94a0c8270","type":"artist","uuid":"85dce920-19e8-4449-9084-a13a97de6928"}
album: The Cyclic Night
  type: MusicAlbum
  date published: 2013-08-01
  track: Prologue (Tango Apasionado)
    type: MusicRecording
    duration: PT1M44S
    duration ms: 104645
    explicit: false
    by artist: 1721 Project
    in album: The Cyclic Night
      type: MusicAlbum
      date published: 2013-08-01
    genre: tango
    isrc code: NLD711603202
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-04T18:31:40+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x4e8e7f54390beca38d078bdf8a21f030e56a674c8a424ec06fbb561e4b2147ce
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956725
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956725
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD711603202
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T01:12:41Z
    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 0x4e8e7f54390beca38d078bdf8a21f030e56a674c8a424ec06fbb561e4b2147ce. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLD711603202.
      date published: 2026-07-05T01:12:41Z
    audio: Prologue (Tango Apasionado)
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 107.616
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.518
      additional property: Energy
        type: PropertyValue
        value: 0.136
      additional property: Speechiness
        type: PropertyValue
        value: 0.031
      additional property: Acousticness
        type: PropertyValue
        value: 0.853
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.904
      additional property: Liveness
        type: PropertyValue
        value: 0.127
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.351
      additional property: Loudness (dB)
        type: PropertyValue
        value: -14.277
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Minor
  track: Finale (Tango Apasionado)
    type: MusicRecording
    duration: PT3M59S
    duration ms: 239776
    explicit: false
    by artist: 1721 Project
    in album: The Cyclic Night
      type: MusicAlbum
      date published: 2013-08-01
    genre: tango
    isrc code: NLD711603219
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T19:58:21+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x4146823c31b44f5f057474ad5c299315436cc25e9576a0d2ec7690996d279512
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958194
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958194
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD711603219
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T20:32:27Z
    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 0x4146823c31b44f5f057474ad5c299315436cc25e9576a0d2ec7690996d279512. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NLD711603219.
      date published: 2026-07-15T20:32:27Z
    audio: Finale (Tango Apasionado)
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 95.403
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.32
      additional property: Energy
        type: PropertyValue
        value: 0.115
      additional property: Speechiness
        type: PropertyValue
        value: 0.03
      additional property: Acousticness
        type: PropertyValue
        value: 0.907
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.742
      additional property: Liveness
        type: PropertyValue
        value: 0.11
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.21
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name

Loudness (dB)
type: PropertyValue
value: -13.865

Key Name
type: PropertyValue
value: C

Mode Name
type: PropertyValue
value: Minor

The Cyclic Night
type: MusicAlbum
date published: 2016-05-03