Old Havana
type: MusicGroup
description: Old Havana () is the city-center (downtown) and one of the 15 municipalities (or boroughs) forming Havana, Cuba. It has the second highest population density in the city and contains the core of the o
popularity: 2
followers: 7
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf1c52ebf5b1d46807f941b905871cf0b92c5454c0e7eb52b2e3af7758771b53f
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/757d3811-8498-4cb5-a4a1-81c1063c335f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/757d3811-8498-4cb5-a4a1-81c1063c335f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/757d3811-8498-4cb5-a4a1-81c1063c335f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf1c52ebf5b1d46807f941b905871cf0b92c5454c0e7eb52b2e3af7758771b53f","name":"Old Havana","registered_at":"2026-06-17T06:27:59Z","symbol":"NIM1309653","token_address":"0xb34a64b7651b7139feb3eb3b2405567275500da0","type":"artist","uuid":"757d3811-8498-4cb5-a4a1-81c1063c335f"}
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 0xf1c52ebf5b1d46807f941b905871cf0b92c5454c0e7eb52b2e3af7758771b53f. 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/757d3811-8498-4cb5-a4a1-81c1063c335f.json and https://artists.proofprofile.net/proofs/artist/757d3811-8498-4cb5-a4a1-81c1063c335f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xf1c52ebf5b1d46807f941b905871cf0b92c5454c0e7eb52b2e3af7758771b53f","name":"Old Havana","registered_at":"2026-06-17T06:27:59Z","symbol":"NIM1309653","token_address":"0xb34a64b7651b7139feb3eb3b2405567275500da0","type":"artist","uuid":"757d3811-8498-4cb5-a4a1-81c1063c335f"}
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