April
type: MusicGroup
description: April is the fourth month of the year in the Gregorian and Julian calendars. Its length is 30 days. April is commonly associated with the season of spring in the Northern Hemisphere, and autumn in th
popularity: 5
followers: 21
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf0f49afbe155033bab6ca2b887d577cc8d759a715eea9dce859503aecc81eb5f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954784
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954784
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fa296b59-4323-4715-b39d-dd2436731528.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fa296b59-4323-4715-b39d-dd2436731528.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/fa296b59-4323-4715-b39d-dd2436731528
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
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 0xf0f49afbe155033bab6ca2b887d577cc8d759a715eea9dce859503aecc81eb5f. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa296b59-4323-4715-b39d-dd2436731528.json and https://artists.proofprofile.net/proofs/artist/fa296b59-4323-4715-b39d-dd2436731528.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
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  type: MusicAlbum
  date published: 2015-02-16
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  type: MusicAlbum
  date published: 2015-04-07
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  type: MusicAlbum
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album: april #1 ～HANEDA INTERNATIONAL ANIME MUSIC FESTIVAL Presents～
  type: MusicAlbum
  date published: 2017-03-01
album: april #1 ～HANEDA INTERNATIONAL ANIME MUSIC FESTIVAL Presents～
  type: MusicAlbum
  date published: 2017-03-01
album: april #2 ～HANEDA INTERNATIONAL ANIME MUSIC FESTIVAL Presents～
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  date published: 2017-03-22
album: april #3 ～HANEDA INTERNATIONAL ANIME MUSIC FESTIVAL Presents～
  type: MusicAlbum
  date published: 2017-12-13
album: april #3 ～HANEDA INTERNATIONAL ANIME MUSIC FESTIVAL Presents～
  type: MusicAlbum
  date published: 2017-12-13