Toronto is the most populous city in Canada and the capital city of the Canadian province of Ontario. With a 2021 Census population of 2,794,356, the city is the fourth-most populous city in North Ame
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 0xdfb53b855e849ee38f211bd582667fae087206937c140417a2b2a9bbf8d0cad6. 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/3972ad50-d2c1-4203-b7d8-2c1bf4060f43.json and https://artists.proofprofile.net/proofs/artist/3972ad50-d2c1-4203-b7d8-2c1bf4060f43.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 0x0611b4a464bad3680ba33d02057abf7c58edfcf3c5f2890f6c605e11568e364b. 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/CAS269900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74853f24f84a43044af11cc38033c34464db7cc0dd1b5ff40030ff3377ce0e51. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAS260200095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640dbff1cf3444495e78d4813fab273ad5761a8c1997342e92e8783200aa21ae. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CAS260200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501814298ca127c600ae69cd8416c019a44066ba0ab73683f3caf6073964384b. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/CAS260200091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74853f24f84a43044af11cc38033c34464db7cc0dd1b5ff40030ff3377ce0e51. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CAS260200095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180cf1cccc4aac6d947087ba415aec9562c3c02d6a54bf8c6b22467c65e6904e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CAS260200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6943a4f28035fd5084586bbd108d242d4a94c032158cecf5318acbb8023143. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/CAS260200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec901e3b3b2b29ba85039f39c6bbd6095ffe88fcf3b3c1a7eb372607ce54047f. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/CAS260200074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c3dff7242044fa78a3ec6694f8af61a96bf0be884b9cb3b0baac3f14b49e19. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/CAS260200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd398d9ed2418149549eff56dd358f061aaa69190191427f170297733fd70f3ec. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAS260200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf68f3af7316a1ebd16a8ac615b2947ef18e05e232b221ef220242ac8d5069ed. 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/CAS260200141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd811989c3d6c328f8dbe5f11753e625d45fc48e1cc3c2597c88ed90baa8352. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/CAS260400241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf68f3af7316a1ebd16a8ac615b2947ef18e05e232b221ef220242ac8d5069ed. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/CAS260200141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906dab59d5933595efadea9a524e6c44773473a6c4fe417b5a8c8cf69ad503e9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CAS260400240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd811989c3d6c328f8dbe5f11753e625d45fc48e1cc3c2597c88ed90baa8352. 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/CAS260400241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471604922b0a264eb7f6c4852b4d832238b46a5bc1ca849300e5c06ec197d9e6. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/CAS260400245.