ABREU
type: MusicGroup
genre: portuguese hip hop
description: Abreu may refer to: Abreu (surname) Places University "Marta Abreu" of Las Villas, a university in Santa Clara, Cuba Abreu Vineyards, a winery in Napa Valley, US Abreu Camp, a settlement within Phi
popularity: 2
followers: 223
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x79fb555bb0c1621c5949d9cb570a767eac861b3cf678d0f0af5c525f063ec115
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953941
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953941
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/210d0df6-e623-48ee-b785-d59392695075.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/210d0df6-e623-48ee-b785-d59392695075.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/210d0df6-e623-48ee-b785-d59392695075
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T11:51:19Z
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 0x79fb555bb0c1621c5949d9cb570a767eac861b3cf678d0f0af5c525f063ec115. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/210d0df6-e623-48ee-b785-d59392695075.json and https://artists.proofprofile.net/proofs/artist/210d0df6-e623-48ee-b785-d59392695075.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T20:07:57Z
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