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 0xa9ead3c4dc1a0dfeadee769557a3e2dda7fc13f3ede04d3c48435cd9be85f0a0. 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/f56dcc3a-289b-4deb-9824-4e718c4ba0a5.json and https://artists.proofprofile.net/proofs/artist/f56dcc3a-289b-4deb-9824-4e718c4ba0a5.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 0x87f7245fe67cc9b102231a6cf5ecec130ff73403c5fb9a2cfa4bc5029fd07724. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZK6Q2268664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd605167e01ee31c92443f187810976de950178ef1362d8e399ca2169e0edd9bf. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZK6P2276411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa984831e4d8ac09526f8ae140623b620b9f72def4002f6795e34730eeb49a0ce. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZK6P2276412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1dc3204f1f1c44ce2049fb1b2e612a4121757edac9f3f56ef0a10fd9473680. 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/QZFZ32078414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5754704551ef1386dd71e763737bd0dca0e07663a0faacefeb53089e953d8514. 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/SE62M2341123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8995de2425ae3976686a0ba4287ed001a2b8c949c29625ae36609723f46c68. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZTB72224055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160950460a7f11b46b1df0d7678b5a2a726bed156dc557fb630ad3e5e0347df9. 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/QZK6H2062882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3dae7c05736e41223eeb17cca5fd72678fa585be3a8d9fe83c24c79f3e1c62. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6H2062886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afc6960a300bcc4bea8c564ac3aa1dfb520cbab8a61e09c1972228f4a8a0913. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6H2062893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda203e1a9207e4ab51a44a3168346a5f508f407ddecc63a2705b079badbf30ed. 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/QZFZ61951485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdf47236a39c770e6b8dbd1cdd7dbcd1701d02c18104509c14e2632a733cace. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QZFZ61951487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4198c638e9c9e1de714e12207a5f88543d8df38e717b5d3aaadeb0023ba3f5c. 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/QZFZ61951491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9344c0a72a16972e8d2c51e9b237079488aae30f300099a954e36f8f14f83e63. 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/QZFZ61951492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d36f3e088a82a2d6e68a4624729d77a4d30fa5cbf9c5db0c16b62326f3faab. 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/QZFZ61951497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce58d826cb003ce542ba9708779531d6dcf1b71708fd10bd75b5c7be531d35cc. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZFZ32081939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900a287d79b011f2703464310118c6b9fb0adda068630cc4a3096b1f4a9acb36. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZFZ32081940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504654db888fc9ecd53474c026fdbe1a33b056d9abefd84a53ecd5b00370aaab. 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/QZRP52199246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fde558a1a66dc8fe280774414ef943cd76f5a48a15382cfaf82971d707b3535. 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/QZHN42174932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304a6ca36991f09902ce6a142f3a3cca883f4f903485a93150a63f2c7449bde8. 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/QZDA62072086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f50aeccb36da5921ee11f554c6f65b54af20bb413b00683f28c7fedad53f41. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SE6I32132731.