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 0x0942b09e29420357379ea4e886601c936cdef8fbab6c19a72a6b301cae53fe34. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/042b0a1b-f058-4c4e-81fb-9dbf6bc22857.json and https://artists.proofprofile.net/proofs/artist/042b0a1b-f058-4c4e-81fb-9dbf6bc22857.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 0xd9727ead58c635295d310cdd992b344e70e65fd8377035f4db8a86e765b69b7b. 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/GBKQU1885809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bee33c0157fce3ce60482bd5c58ec5feecca05f590c45e6ea607d6a1360ddae. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBLV62123098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f95215e7b3ef1d23ee9e951e8d236fae9de3342772ea24b3a91efb121404fa0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBLV62127990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128a6c84604abec8990478314a75537495fb64a7e65a90f66b25b165547c89a4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBLV62127991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f880b26dd0bd149cb725af663d76b8e946a0022bdd8faf02da0613fe6c6ea4. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/GBLV62127992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e66290c1b50e12308c9506a5b3f5912529fc0bde979b29725d57877e95954b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBLV62127993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c132db3cbbda7a674d1299274cd1817c9d6ea1fb6988ebc3ff4cdccc7824ccb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBLV62127994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5004fdf9361004892ddf5bedce59b7cb1e1016fa91549bf856698ce4100d7c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBLV62127995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94400bed5385a9ebc0cf7c9bb0001de0889905c374e7839b6cd10a8df72b71d5. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBLV62127996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e994ca993f6a64565958d3b0533077693a6e612e83fc11ad0f29f6cf8796009. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBLV62127997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7751ee6737f1b91949ae5e0aa52986bc1d2df32b19233aeee08635be4ec0b1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBLV62127998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8541d537ff9c3896b69e09d3be33533930f96a6db627b6cad2bb420c2361d10c. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/GBKQU2464110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285da524b1b9e5354699548eb49db83d70d43437d353827feea32b3a963e8183. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBLV62418490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8e15b8ea997f8e3590764c7f84123c3a29751b1ba65af6ed312392f24b3a3e. 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/GBKQU2521489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1104639b48857f5d996363f60787295fc3c9c6ba8800a11ecb4dc2884e726527. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/GBKQU2555977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6e94c548a3c31fd088464de30152d4fcce07c9ae713a5a35f6bf5db26412e6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKQU2380032.