Contra K
type: MusicGroup
popularity: 2
followers: 54
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x09ef1b1114e99fb06e3ec4e8c8e1748339c0ab8f2ff79979d148ad047f33b567
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954062
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954062
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/46972676-0df0-4f25-804b-53dbe1d81236.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/46972676-0df0-4f25-804b-53dbe1d81236.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/46972676-0df0-4f25-804b-53dbe1d81236
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T07:39:10Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x09ef1b1114e99fb06e3ec4e8c8e1748339c0ab8f2ff79979d148ad047f33b567","name":"Contra K","registered_at":"2026-06-16T14:10:07Z","symbol":"NIM1076314","token_address":"0x2f310d2c1477d9c5f556268709a1a19d880ea1dd","type":"artist","uuid":"46972676-0df0-4f25-804b-53dbe1d81236"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ef1b1114e99fb06e3ec4e8c8e1748339c0ab8f2ff79979d148ad047f33b567. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/46972676-0df0-4f25-804b-53dbe1d81236.json and https://artists.proofprofile.net/proofs/artist/46972676-0df0-4f25-804b-53dbe1d81236.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T07:39:10Z
  text: {"copyright_id":"0x09ef1b1114e99fb06e3ec4e8c8e1748339c0ab8f2ff79979d148ad047f33b567","name":"Contra K","registered_at":"2026-06-16T14:10:07Z","symbol":"NIM1076314","token_address":"0x2f310d2c1477d9c5f556268709a1a19d880ea1dd","type":"artist","uuid":"46972676-0df0-4f25-804b-53dbe1d81236"}
album: Pode Ir
  type: MusicAlbum
  date published: 2021-04-05
album: Só Mais uma Saida
  type: MusicAlbum
  date published: 2021-07-14
album: Acabou
  type: MusicAlbum
  date published: 2022-02-02
album: Contra K
  type: MusicAlbum
  date published: 2023-05-28
album: Um Jogo Que Se Perde e Ganha
  type: MusicAlbum
  date published: 2025-06-23