Fen
type: MusicGroup
genre: dark ambient
genre: folk metal
description: thumb|upright=1.3|Avaste Fen, Estonia. Sedges dominate the landscape. Woody shrubs and trees are sparse. thumb|upright=1.3|Wicken Fen, England. Grasses in the foreground are typical of a fen. A fen i
popularity: 16
followers: 159
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc0d6aba635b395bd051a183f20c2df52a90476bd68cfd60b96d55aee0e43b315
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953807
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953807
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f2473dad-93fe-4731-9ac5-a71b896b5a76.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f2473dad-93fe-4731-9ac5-a71b896b5a76.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/f2473dad-93fe-4731-9ac5-a71b896b5a76
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T16:39:18Z
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 0xc0d6aba635b395bd051a183f20c2df52a90476bd68cfd60b96d55aee0e43b315. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2473dad-93fe-4731-9ac5-a71b896b5a76.json and https://artists.proofprofile.net/proofs/artist/f2473dad-93fe-4731-9ac5-a71b896b5a76.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T16:45:15Z
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