Leo Mathisen
type: MusicGroup
genre: dansktop
genre: swing music
description: Leo "The Lion" Mathisen (10 October 1906 – 16 December 1969) was a Danish jazz pianist, composer, arranger, singer and bandleader. He was a leading figure of the thriving Danish scene during the years
popularity: 8
followers: 632
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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 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 0xa18b6b5d783e9f938cc8245bc7e84e529204a6ce67a9115ea54bb948adc895fb. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1abcd9e-eaa3-4e1b-93bf-97eb5bbd8edc.json and https://artists.proofprofile.net/proofs/artist/b1abcd9e-eaa3-4e1b-93bf-97eb5bbd8edc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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album: JAZZ CLUB Vol. 5
  type: MusicAlbum
  date published: 1947
album: Leo The Lion (Remastered)
  type: MusicAlbum
  date published: 1962
album: How How (Remaster)
  type: MusicAlbum
  date published: 1962
album: Take It Easy (Remaster)
  type: MusicAlbum
  date published: 1962
album: Leo Mathisen 1944-48
  type: MusicAlbum
  date published: 2007-08-20
album: To Be or Not to Be: 1941-42
  type: MusicAlbum
  date published: 2008-02-01
album: Take It Easy and Boogie
  type: MusicAlbum
  date published: 2010-06-21
album: Copenhagen Blues: 1944-46
  type: MusicAlbum
  date published: 2011-09-01
album: The Best Of Leo Mathisen Vol. 2
  type: MusicAlbum
  date published: 2011-11-18
album: The Best Of Leo Mathisen Vol. 3
  type: MusicAlbum
  date published: 2011-11-18
album: The Best Of Leo Mathisen Vol. 1
  type: MusicAlbum
  date published: 2011-11-18
album: Jazz Club Vol. 9
  type: MusicAlbum
  date published: 2012-03-09
album: Jazz Club Vol. 14
  type: MusicAlbum
  date published: 2012-03-17
album: TætPå Vol. 2
  type: MusicAlbum
  date published: 2013-07-07
album: Long Shadows: 1947-51
  type: MusicAlbum
  date published: 2015-03-20
album: Danish Jazz, Vol. 2
  type: MusicAlbum
  date published: 2015-10-30
album: JAZZ CLUB Vol. 9
  type: MusicAlbum
  date published: 2017-03-26
album: JAZZ CLUB Vol. 8
  type: MusicAlbum
  date published: 2017-04-22
album: TætPå (Vol. 2)
  type: MusicAlbum
  date published: 2017-07-11
album: JAZZ CLUB Vol. 10
  type: MusicAlbum
  date published: 2018-07-29
album: Leo Mathisen - De Bedste
  type: MusicAlbum
  date published: 2019-06-14
track: My Baby Just Cares for Me
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  explicit: false
  by artist: Leo Mathisen
  in album: The Great American Songbook: 66 American Standards
    type: MusicAlbum
    date published: 2020-01-17
  isrc code: DKABA0700291
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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 0xb17b0261058f193c9bf4e34f19e2dc8ef529dddd82061318e44ad78b17d45c75. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKABA0700291.
    date published: 2026-07-08T03:20:19Z
  audio: My Baby Just Cares for Me
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Time Signature
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    additional property: Danceability
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Acousticness
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track: Take it easy
  type: MusicRecording
  duration: PT3M20S
  duration ms: 200026
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  by artist: Leo Mathisen
  in album: Dansk Filmusik & Danske sange
    type: MusicAlbum
    date published: 2004-01-01
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  subject of: OpenTimestamps Proof of Existence
  audio: Take it easy

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OTSVerificationAPI
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value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKC991701209

OTSTimestamp
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value: 2026-07-29T19:35:34Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d1a6998482bb1d2ef01c2909af1e64a81f1b1af51dce776b14de2744469803. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DKC991701209.
date published: 2026-07-29T19:35:34Z

Take it easy
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