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 0x3392652079bd4a646d5f8f0005b7531226d6803699df5e13a80ab482cd683f5c. 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/352ab94f-37fa-4cf2-99ff-eb9f98e7dccb.json and https://artists.proofprofile.net/proofs/artist/352ab94f-37fa-4cf2-99ff-eb9f98e7dccb.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 0x889332dc28bfc2a301c1eec14553d59e0cef3da47edb49acad72d322ad26c7c5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEE861901598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42f0fc177d4845804db1c97dd00584757e7c2b1b811fded7adf04c4f142589f. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/DEE861901193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f69bb749608ab3bf52c55d60c5fe1fd7e40465eb7fc02215cca73e7713fdda. 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/DEE861901594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a06b5536b7a8c5f90397cba48bd08ec4ffb93934db487865ffed51b7256806e. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/DEE861901595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc94047446a77cb5dfc892e6fea784972a52c979049f9a902aeb053644ca2461. Chain 2 (Bitcoin): anchored in block 957634 (2026-07-12T00:26:43Z), 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/DEE861901596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bc8ff39329222155b4507deb0b6a040b5ee4e42744a5b661d4f6e706703c9e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEE861901599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa932a8089ad93a626303098a6d2f67fdaf3aaa0b2438bb640027c25fea12d0a6. 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/DEE862000515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20b17a8acce80f3ed10546c3d8338d96e2b2d16e7df50bf0557ebfd1a8dcf6a. 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/DEE862100483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f64b909e07012a8b426ca8456cd8cf6bcb9059f6c6d68e9b612162500688e0. 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/DEE862100544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe295d0026f09f7bccd0c70e9f297f61b1296457efdd3633719ab615fe1466e46. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/DEE862100545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4152dbac4e1438c9e6ad54ae50122d58272a7726159e91ef70c54187931c6963. 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/DEE862100546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0daa6ee24de71d0183152d7476c4a473ff727d0957a8ecee759e6bdc84ff508. 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/DEE862201005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0daa6ee24de71d0183152d7476c4a473ff727d0957a8ecee759e6bdc84ff508. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEE862201005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e76542244cd54cbdd204d40b29da3afb66c2151051231abe971a5044fe8bd84. 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/DEE862201273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c43541edf51dfbc1accdaadd43bc6de597ba7eb23ff3d48d0501928c999cac. 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/QZWFP2460038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41a76cc16ddf72a4232b4dd79c39819f1bacb2f3dd132f95f1cbb659b292420. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZDA42531411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d7a2f287edff23362cd496cdabc87efc26bde807f873b43b968fbc747e7638. 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/DEE862102973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85dab4f42447dd81796f68057c0aaedd0e5c87104d87faece66200e2b49aaf59. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DETO32100452.