April Underwood
type: MusicGroup
description: April Underwood is an American venture capitalist and board director who was the chief product officer at Slack. She founded Adverb Ventures in 2023 with Jessica Verrilli. Before joining Slack, she h
popularity: 2
followers: 20
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x15c5b51b50020ed06571b8ecdcb04df53a66598c9128c8db3a547e5144c2dc13
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/69af27f1-0b8a-4384-8fb5-c95869cae3bd.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/69af27f1-0b8a-4384-8fb5-c95869cae3bd.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/69af27f1-0b8a-4384-8fb5-c95869cae3bd
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x15c5b51b50020ed06571b8ecdcb04df53a66598c9128c8db3a547e5144c2dc13","name":"April Underwood","registered_at":"2026-06-17T02:19:06Z","symbol":"NIM1250245","token_address":"0x7a3dedbe4f9eb34251da1e48d1c3e7a5718d7e79","type":"artist","uuid":"69af27f1-0b8a-4384-8fb5-c95869cae3bd"}
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 0x15c5b51b50020ed06571b8ecdcb04df53a66598c9128c8db3a547e5144c2dc13. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69af27f1-0b8a-4384-8fb5-c95869cae3bd.json and https://artists.proofprofile.net/proofs/artist/69af27f1-0b8a-4384-8fb5-c95869cae3bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x15c5b51b50020ed06571b8ecdcb04df53a66598c9128c8db3a547e5144c2dc13","name":"April Underwood","registered_at":"2026-06-17T02:19:06Z","symbol":"NIM1250245","token_address":"0x7a3dedbe4f9eb34251da1e48d1c3e7a5718d7e79","type":"artist","uuid":"69af27f1-0b8a-4384-8fb5-c95869cae3bd"}
album: Chymes
  type: MusicAlbum
  date published: 2023-08-16
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  type: MusicAlbum
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  type: MusicAlbum
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  type: MusicAlbum
  date published: 2024-11-09