40
type: MusicGroup
genre: k-ballad
description: 40 or forty commonly refers to: 40 (number), the natural number following 39 and preceding 41 one of the years 40 BC, AD 40, 1940, 2040 40 or forty may also refer to: Music 40 (record producer)
popularity: 19
followers: 68
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x70d5eab745b0d0bc91cedb5e928ac1df69eac7b8092d723e572ef636502cbe3e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953786
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953786
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d7f7ab82-0542-405a-919d-8eb3cd6983da.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d7f7ab82-0542-405a-919d-8eb3cd6983da.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d7f7ab82-0542-405a-919d-8eb3cd6983da
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T12:56:12Z
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 0x70d5eab745b0d0bc91cedb5e928ac1df69eac7b8092d723e572ef636502cbe3e. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7f7ab82-0542-405a-919d-8eb3cd6983da.json and https://artists.proofprofile.net/proofs/artist/d7f7ab82-0542-405a-919d-8eb3cd6983da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T12:56:12Z
album: 듣는편지
  type: MusicAlbum
  date published: 2013-01-25
album: 듣는편지
  type: MusicAlbum
  date published: 2013-01-25
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  type: MusicAlbum
  date published: 2013-11-22
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  type: MusicAlbum
  date published: 2018-05-04
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  type: MusicAlbum
  date published: 2019-02-04
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  type: MusicAlbum
  date published: 2019-05-17
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  type: MusicAlbum
  date published: 2019-09-30
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  type: MusicAlbum
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  type: MusicAlbum
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  type: MusicAlbum
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  type: MusicAlbum
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  type: MusicAlbum
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  type: MusicAlbum
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  type: MusicAlbum
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  type: MusicAlbum
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  type: MusicAlbum
  date published: 2022-08-29
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  type: MusicAlbum
  date published: 2022-08-30
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  type: MusicAlbum
  date published: 2022-08-31
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  type: MusicAlbum
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  type: MusicAlbum
  date published: 2022-09-02