SIGMA
type: MusicGroup
description: Sigma ( ; uppercase Σ, lowercase σ, lowercase in word-final position ς; ) is the eighteenth letter of the Greek alphabet. When used at the end of a letter-case word (one that does not use all caps), t
popularity: 8
followers: 1513
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfd98f86103752de79802b105bf9e74f1c79c7f9be825b2ec0f367a25fa1ce662
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954631
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954631
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d08585d0-306f-4dfb-a7ec-07bf73063b73.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d08585d0-306f-4dfb-a7ec-07bf73063b73.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d08585d0-306f-4dfb-a7ec-07bf73063b73
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T02:46:24Z
additional property: OTSCanonicalRecord
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd98f86103752de79802b105bf9e74f1c79c7f9be825b2ec0f367a25fa1ce662. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d08585d0-306f-4dfb-a7ec-07bf73063b73.json and https://artists.proofprofile.net/proofs/artist/d08585d0-306f-4dfb-a7ec-07bf73063b73.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T02:46:24Z
album: Hiroshima
  type: MusicAlbum
  date published: 2022-09-02
album: Hiroshima
  type: MusicAlbum
  date published: 2022-09-02
album: DIE
  type: MusicAlbum
  date published: 2022-09-16
  track: DIE
    type: MusicRecording
    duration: PT2M24S
    duration ms: 144900
    explicit: true
    by artist: SIGMA
    in album: DIE
      type: MusicAlbum
      date published: 2022-09-16
    isrc code: RUA1D2275178
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-03T07:48:47+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x76f92bcd2fa402342c70975865cc39af1504f9e169b4ed08638b3fc7a877e1af
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956484
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956484
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/RUA1D2275178
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-03T10:47:44Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f92bcd2fa402342c70975865cc39af1504f9e169b4ed08638b3fc7a877e1af. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/RUA1D2275178.
      date published: 2026-07-03T10:47:44Z
    audio: DIE
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 100.045
      additional property: Musical Key
        type: PropertyValue
        value: 10
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.548
      additional property: Energy
        type: PropertyValue
        value: 0.753
      additional property: Speechiness
        type: PropertyValue
        value: 0.054
      additional property: Acousticness
        type: PropertyValue
        value: 0.01
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.168
      additional property: Liveness
        type: PropertyValue
        value: 0.519
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.446
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.513
      additional property: Key Name
        type: PropertyValue
        value: Bb
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: DIE
  type: MusicAlbum
  date published: 2022-09-16
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  type: MusicAlbum
  date published: 2022-10-14
album: WASSUP
  type: MusicAlbum
  date published: 2022-10-14
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  type: MusicAlbum
  date published: 2022-11-04
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  type: MusicAlbum
  date published: 2022-11-04
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  type: MusicAlbum
  date published: 2023-01-20
album: Тревога
  type: MusicAlbum
  date published: 2023-01-20
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  type: MusicAlbum
  date published: 2023-05-26
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  type: MusicAlbum
  date published: 2023-06-16
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  type: MusicAlbum
  date published: 2023-07-07
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  type: MusicAlbum
  date published: 2023-12-22
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  type: MusicAlbum
  date published: 2023-12-22
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  type: MusicAlbum
  date published: 2024-03-01
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  type: MusicAlbum
  date published: 2024-03-01
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  type: MusicAlbum
  date published: 2024-03-22
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  type: MusicAlbum
  date published: 2024-03-22
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  type: MusicAlbum
  date published: 2024-04-19
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  type: MusicAlbum
  date published: 2024-04-19
album: Дизайнер
  type: MusicAlbum
  date published: 2024-05-24
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  type: MusicAlbum
  date published: 2024-05-24
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  type: MusicAlbum
  date published: 2024-09-20
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  type: MusicAlbum
  date published: 2025-03-28