The Portnoy Brothers
type: MusicGroup
description: The Portnoy Brothers are a British–Israeli folk rock duo formed in 2014 by Manchester-born brothers Israel Portnoy (born 1990; vocals, guitar) and Mendy Portnoy (born 1992; keyboards). Their debut alb
popularity: 14
followers: 1873
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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: 2026-06-14T15:20:52Z
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album: No Complaints
  type: MusicAlbum
  date published: 2019-10-31
album: Learn to Love
  type: MusicAlbum
  date published: 2016-09-29
album: October Rain
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  date published: 2024-05-31
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    by artist: The Portnoy Brothers
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      date published: 2024-05-31
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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: 2026-06-13T13:32:09Z
    audio: October Rain
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album: Adon Olam
  type: MusicAlbum
  date published: 2023-04-28
album: Shirat Haasavim
  type: MusicAlbum
  date published: 2021-01-27
album: Yom Shabbaton
  type: MusicAlbum
  date published: 2020-10-20
album: Tzadik Katamar
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  date published: 2020-06-11
  track: Tzadik Katamar
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    by artist: The Portnoy Brothers
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      date published: 2020-06-11
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-06T07:53:57Z
    audio: Tzadik Katamar
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album: Jerusalem of Gold
album: Yigdal
album: Anim Zemirot
album: Shalom Aleichem
album: Over the Rainbow
album: Brothers in Arms

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Jerusalem of Gold
type: MusicAlbum
date published: 2020-05-22

Yigdal
type: MusicAlbum
date published: 2020-05-17

Anim Zemirot
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date published: 2020-02-27
track: Anim Zemirot
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  by artist: The Portnoy Brothers
  by artist: Zusha
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    date published: 2020-02-27
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-02T03:55:08Z
  audio: Anim Zemirot
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Shalom Aleichem
type: MusicAlbum
date published: 2020-01-30
track: Shalom Aleichem
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  by artist: The Portnoy Brothers
  by artist: Shlomo Katz
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    date published: 2020-01-30
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    value: 2026-07-02T03:30:09Z
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-02T03:30:09Z
  audio: Shalom Aleichem
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Over the Rainbow
type: MusicAlbum
date published: 2018-04-17

Brothers in Arms
type: MusicAlbum
date published: 2016-09-27