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 0x8b4765dcaa07529295677026e1a1bd9491c2e0b5f985016fdf48afaad252fd3e. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f60e4bcf-1518-46e0-8826-cd588d2f70c7.json and https://artists.proofprofile.net/proofs/artist/f60e4bcf-1518-46e0-8826-cd588d2f70c7.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 0x608d17324e47a4288d0ccbca3dcdeb6e05a01a75f05552f938adfe624f5d21dd. 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/QMDA61317261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cec356f65497e74bf6d4a73229a89bbe00bcfde81937b159cb58e7a2f404f8. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QMDA61317262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66fd41d4ca22fa24e1a961f74d368ef33464e24187baae633adb08488811dfa. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QMDA61317263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab0902b45c64c4503f3065a94c03039f6f660a0cd8bf01bcc5b5793c5eb36e1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMDA61317264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d3fd2b76e941b2a58dbe152e6480eccd042a43ca702df8161be29750d2cfd5. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QMDA61317265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa106df36658194dd778a158fc2387d63b5839d5d2dfa01c134b93b4583f1aa23. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QMDA61317267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47410816097f35353e8f1aacf9c438262c483a3bbc6098916e6eadc6cf30d8e5. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QMDA61317268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6702fba14617a5862a80562095ec3d6d2103e501c72a29ae00907a42ee228ea. 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/QMDA61317270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76170d0d3450737178e4c9dbe6372e3accd34ffa1e72244d42197880d2e7203a. 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/QMDA61317273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41e0d60bdbd0d43fb5ee6b87ff88690477bf9899f04d4c61b849295cb01a4df. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QMDA61317274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51578a41af6a462d87c064efb3492f615bf9e46b2a995a0004510530d5981251. 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/QMDA61317275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6c9219fff28ec576efd678e79d355e91e43dcebb7e4dca8f1e8cb128a9297c. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QMDA61317277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d932560a19ae9dbd95f02a32d616d8fe5efd034e418969a7315529fd5e0c27. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QMDA61317279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0071f7a26d460e8b3b029b38d4a2329b39304a20b8751ee7adf936b7301769f. 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/QMDA61317281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ea23d620f1673d7fbcb67d3ad419a4592b20f6829e4074aa43e2782618342b. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QMDA61317283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8893f826a45a3ad616563dcfa6295eee85411b18dc26f9e378009c563dafd9. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QMDA61317284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c1c13133e636fb8c325df7aefbd82f44a22a4b96c6ea65b542fbf93f9578d9. 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/QMDA61317285.