Antrum
type: MusicGroup
description: This is a disambiguation page for the biological term. For the 2018 horror movie, see Antrum (film) In biology, antrum is a general term for a cavity or chamber, which may have specific meaning in re
popularity: 2
followers: 6
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x38d16c0da3667d0aafdcc45d049fbd437ea0a8d91b161402d6add3e565ec4bcc
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953923
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953923
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1c67f70f-d5c0-4f83-b7bc-9dd2cd38e014.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1c67f70f-d5c0-4f83-b7bc-9dd2cd38e014.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1c67f70f-d5c0-4f83-b7bc-9dd2cd38e014
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T09:51:37Z
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 0x38d16c0da3667d0aafdcc45d049fbd437ea0a8d91b161402d6add3e565ec4bcc. Chain 2 (Bitcoin): anchored in block 953923 (2026-06-16T09:51:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c67f70f-d5c0-4f83-b7bc-9dd2cd38e014.json and https://artists.proofprofile.net/proofs/artist/1c67f70f-d5c0-4f83-b7bc-9dd2cd38e014.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T09:51:37Z
album: CARPE NOCTEM
  type: MusicAlbum
  date published: 2024-09-29
album: Shawty ví
  type: MusicAlbum
  date published: 2025-07-02
album: Pole růží
  type: MusicAlbum
  date published: 2025-07-30
album: Pure lean
  type: MusicAlbum
  date published: 2025-09-13