Gacek (Polish: ) is a male domestic cat with tuxedo fur. Between 2020 and 2023, this homeless cat was a tourist attraction in Szczecin, Poland. In 2020, a video of Gacek was distributed around the wor
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91af81e660c6e9f104bff61e90b254f408645c541b7ac0baa74d2e263bc16e8d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb7967d7-d5ae-4e4b-a8ed-904d55959062.json and https://artists.proofprofile.net/proofs/artist/cb7967d7-d5ae-4e4b-a8ed-904d55959062.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47beb77ba6668049552e84a698d6e60257631defac366bcfa5c61f53bd428452. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862200347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c232f9c96ab5f5ee5cf7ba7b1125049656813ce6b58f051008698bc4d98206. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862200352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb0f14e338584996041cfb8492d19302b2a2a43cfa7a07defc161fdab690f0f. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862200743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be7fbaec7916147bb4833009e78817e92760713a918ef438da3db7e1923b256. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862300301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cc4ba0ccbd5822045b78881d950265dd87898ea6b164f060495125851a0dc9. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862300304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6191706654ecc8c5b4b9d86c1ba4a6237bbf18cb32f314e2ef96fa188cd62a7a. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862200224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f44c5a00a739754f5e341035c9192fc1c7f2b18a88b690e4107fa76f99a29e. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862300475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bd54964b25807538620b6cdcfc1726452ba8d13e45667259102392073f9208. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d6eea7599b0456fe18c491b92d702e0728f80c8ba2548f6893cc01cebcbd58. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862400484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5e3017bb05c488b3180bd8ec1f22dca547b2c14c0a797ed2739118c7179f3c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862400557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9606c8affdbbc5b6fae00485d701d3890a6286ae7d5aa2d8b6d364771fb83d3e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862400970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f9558cdabee6d8bbfb5655b519395d188f217490cd4e4306f6fa945b302aef. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR862500306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b745779b7e662a4661da86c83fff8c47ec9d35cd5c517786eb94c7cac0fe50c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLC062527538.