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 0x233f87efd85e2434c3b51d64d97185ec52d5137cdcec6da88ed43b808fab0d20. Chain 2 (Bitcoin): anchored in block 953638 (2026-06-14T13:10:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/385c1dc5-99f0-4b7a-91a0-abae48358177.json and https://artists.proofprofile.net/proofs/artist/385c1dc5-99f0-4b7a-91a0-abae48358177.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 0x4270759ff45cafc7fc4ed30c85bfddb6f49d075529144d81b263d128c9096801. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/TCAHF2396005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7af13fb67c80023d7cb076fc9d07d5764cbd62ba7e5a99ef1d206bdfb01e28. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAHF2395987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e65914c295efc6b206d80335870e19cd7e00bcd4aabd0372c854802547391ee. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAHF2395996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1c3a9e326abe67381a3ab1160bce260e97ed060ce165c358c4f4c1907dab25. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAHF2396002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba748712a27f1ad08d131e7f5dc460ff4c17fb27c7a33c9f6d86c643e905485. 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/TCAHF2395991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8811f82fa9f1665069c1ebb0ef7749b56b9c12a5af7de78090e7da6ca3118c3. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAJC2486175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a59f91df9a05d923fa3ba812b5e9794adf4078c34c4c8fbc092f5992dfd8a5e. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/TCAGG2201113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c00dd28d53e45e82143e21925cbdffcbb830905f88397563e89f76bb03738a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAGE2297791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4595fa677c6bb70d793ed2c48b0bb189ca518c955fc6b52c42d442f994250bde. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAHF2396000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d711b8849d415362feda3b464d945ff923edf6780710a8b6e93020c6a6332b0. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAGG2201091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690c6ef0be3d1c5895183213eda52055dae3a8b412180a916576c44e7529be81. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAHF2395993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e2f2022d768f5baa1c9f06f01147db496347b31c81248ac0392ee6832ed8e4. 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/TCAHF2396003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0139d9a6d2656708f987095c87f75bb73545b8687149a815fc6ddb53c018b58c. 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/TCAGE2297788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c61a4b83f853a5b3b8ceb4891263538272c055949258709ee25208c917e3e19. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAGG2201098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf629e7f5f9e778e6591909ff3bf3ba93accc0e5c31ed2f6fc958474c0260a7e. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAGG2201093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6d80edb15a6c501bb95b8d7fb088608d4de9db13e651d18f17c60a99fe5a40. 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/TCAGG2201094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8673569268f960610fa0539606212e3797e548db217ed98446105e490cd8a0be. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCAGG2201096.