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 0xb64be256131cecfe295a0027a3076028b2c060ca0df2f6ae6d29d33de939d5d9. 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/06a39172-4f50-4244-9658-e1a7fa6b20ff.json and https://artists.proofprofile.net/proofs/artist/06a39172-4f50-4244-9658-e1a7fa6b20ff.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 0x21ecb25de09526e97a78b9612fbd34ba4aa0628abb1a1648ec1660025d5cad7a. 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/ES5152100593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc658f077b2803e8fa2d66adbba5d82ef016cf01f27d29806c2c046d01db5c870. 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/ES75E2206497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499d7691b50f8bded1ba19c3a29b075bb78b91ac8a27e2aa58c96a920a1a4c7c. 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/ES75E2301664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a8d2247ba48d6547c07efd118d9aec2aaf58291d09e5391935b19aa2c2d251. 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/QZMZ92393865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0062147fc6e196ed9d36921cff05e5e313d60f172c8bdb6146830640dc8238fe. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:19:28Z), 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/QZW9L2301414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499d7691b50f8bded1ba19c3a29b075bb78b91ac8a27e2aa58c96a920a1a4c7c. 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/ES75E2301664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80c98206a799ed8de5cd84c5ae74172da781f41157924310429ee79f55f40e9. 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/QZGLM2435297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1bb331c2f101b6b578a6b638eb416713e02c6dc6c33668cc2bd605125a9cbf. 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/QZGLS2441195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e1c8479996f5b20f914a3bbff95c6cb16a83d2b4e43408a73bb06096b46f3d. 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/QZGLS2441196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4dc66edb5f173d48c18c97ab468143dc1f62a9e68f9a8d7f49d9359c601015b. 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/ES75E2408660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0a626fdf1de333b6e8f0d395ce2129b8282fb912eed3ece9d7f19944500d20. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:07:20Z), 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/ES75E2409030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7499dffcd119c6c9505088b8a4558280626998087e78c10c705de5ff2b9de4c. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/ES75E2410745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ab7ca2004cc42294bd92b676a436a71fe13d31f873103ce7d426f88b3690e3. 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/ES75E2411394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bdda4281d0ca9f8a14bc060e5aab62162184bd2cf5459543cd9ee61e22e433. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/ES75E2412353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74813279fcb2a3e72b5a8bec94380bf253d4793e10ef281c31d6028639d0aef. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ES75E2413810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff218c3ebee74d6fed2b5e3458253a4c218e1d3ea1a703f17f6b562b24312328. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QM4TW2526416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd8a06e9702fb714a08bbeef1801bf4ba9332d11bef71b99a11218fa6165ae2. 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/QM4TW2568840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832169f21da4efaf2b7966791db8f1f8d135c39e2dca5bfbe1909642b6d3d7ba. 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/QM4TX2595601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832169f21da4efaf2b7966791db8f1f8d135c39e2dca5bfbe1909642b6d3d7ba. 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/QM4TX2595601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab9e3a9e966444b9d40b037e87c4b6cf1dc17874a21c112d73df13cfb39f477. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QM7282592442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40935cdb7d5903c89b47ef780b4355e5f5f83133326275f24f73aca7c6bdef9. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMBZ92541613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603490e283269abfefc94c0dbc56585828c104284e70d482542c1077134c9d70. 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/QMBZ92541665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451292cb5caf8f426fa5e41a870938c6f59033114dd9e6e0b879e280ed4948a6. 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/QM6P42587500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7da591cc12cbc8dfd3c74360aeedfea4679b91a9ff374f6d54340ae4089552. 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/ES71G2503519.