1+1
type: MusicGroup
description: 1+1 is a mathematical expression that evaluates to: 2 (number) (in ordinary arithmetic) 1 (number) (in Boolean algebra with a notation where '+' denotes a logical disjunction) 0 (number) (in Boolea
popularity: 2
followers: 237
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xcf5a4ea43f24e29ab558310030f6bee80b2e57a1e7c35ae98b9391f4db7a53b5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954638
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954638
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d3f448e6-2d57-4c97-b5a2-32837b5e9f49.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d3f448e6-2d57-4c97-b5a2-32837b5e9f49.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d3f448e6-2d57-4c97-b5a2-32837b5e9f49
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T03:45:44Z
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 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 0xcf5a4ea43f24e29ab558310030f6bee80b2e57a1e7c35ae98b9391f4db7a53b5. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3f448e6-2d57-4c97-b5a2-32837b5e9f49.json and https://artists.proofprofile.net/proofs/artist/d3f448e6-2d57-4c97-b5a2-32837b5e9f49.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T03:45:44Z
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  type: MusicAlbum
  date published: 2013-02-22
album: Drama
  type: MusicAlbum
  date published: 2013-02-22
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  type: MusicAlbum
  date published: 2014-11-11
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  type: MusicAlbum
  date published: 2014-11-11
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  type: MusicAlbum
  date published: 2019-01-11
album: まだ確定の日程は決まっていないのですが
  type: MusicAlbum
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  type: MusicAlbum
  date published: 2019-09-22
album: 1+1 THE BEST
  type: MusicAlbum
  date published: 2021-06-22
album: 1+1 THE BEST
  type: MusicAlbum
  date published: 2021-06-22