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 0xedeff6c5a585650fc7e20edd6434aded0892189611f837c47112397ed6ace7b5. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16e7edd9-4df8-4ffa-bf06-f855e8b7406f.json and https://artists.proofprofile.net/proofs/artist/16e7edd9-4df8-4ffa-bf06-f855e8b7406f.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 0xb4d7379e686984ea4c4571084e3418f3d1d1dfec9d1a833ef9ff281f2250e484. 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/US23A1512013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4421ea3770f284638d674bb568c26cf95071a3dfb5044ca91be329b795ff364. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US23A1512014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c2d6c47672441a1001fbaddebd179199b482f2dff477e35f853b1bfb89afe1. 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/US23A1512015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcceedb67a2b49168f2460177a8a3af89b0b38e9941f2ca0ac355dab87e47303d. 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/US23A1512016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003c0e38db7c689fb64b474e30663394a7b1e85c9d2ed8eca122aa0e64465a40. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/US23A1512017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41104001bfd2c933f8118c28727e45d48136ad4c88f320d078234b84f615c26b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US23A1512018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf88c556c9b3eb2c90cd68cbb837395df033c2608d9e7d194e9f63695bbf02f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US23A1512019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224cff7309cf4178cafa7b81f5cc34d919caac60a1f857b98dc2df4c6e8312eb. 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/US23A1512020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ae06e745f45ea2db52b968bd215b2dc16b0560a77240045cb9f294392fb3e9. 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/US23A1512021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7751f03e0726bd9319ebb0b65fcb686fdaffa7c870abc624257065b073b25954. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/US23A1512022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e5f4a5ad33d14d535e92db2b10cad3e13f86198ed0024f6abd53080fbce983. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/US23A1512023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e5f4a5ad33d14d535e92db2b10cad3e13f86198ed0024f6abd53080fbce983. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/US23A1512023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ae06e745f45ea2db52b968bd215b2dc16b0560a77240045cb9f294392fb3e9. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/US23A1512021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d7379e686984ea4c4571084e3418f3d1d1dfec9d1a833ef9ff281f2250e484. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US23A1512013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224cff7309cf4178cafa7b81f5cc34d919caac60a1f857b98dc2df4c6e8312eb. 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/US23A1512020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60743667acc16fe3be25c2daa2fba2db53b3d960085f7cf3e0060cc841d40e9. 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/QM4TX1919650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1e1f18b25828065e8e3909768b148787464b2eb0f0cb63a9eca650396fa084. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/TCABX1459985.