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 0x3cf9d3374481969459eba59e4d4a3e5aaf75ba6a4da7468060a05e9f0aebe837. 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/33f4854c-3e75-456a-9317-209da9c0820e.json and https://artists.proofprofile.net/proofs/artist/33f4854c-3e75-456a-9317-209da9c0820e.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 0x0477b333b4d3bf59d49572dc6f2fd95d0c5fd4027c3ba6bef35b4b5ecb8c0f53. 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/DEQ021904698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae9cbb5efcadab7962ca827a2876a28717f7b8ee05f5f832422702948a78d26. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/DEQ021904699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe203c47d32a1e9ae080e7fcac0c2673b874da4256485c6b2419cd64d8ee96fd7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEQ021904701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e639f5137090f23844e07b2b9835131cf468120c0acc328412aaa3b50391a89. 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/DEQ021904702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d451556c659aab3ce3cf7a3b3710cc63647ffd4ff59aedf466a0ea997b98765. 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/DEQ021904704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8563fb8d714939cd0cad7ff749e510120bbb6a7dd6c830b7041ddba55e72c77f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEQ021904705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fcfcf18c67d087a06fba786b56427c96d2a4b2e568fbbd8166fd16cf509d0b1. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEQ021904707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7893d4e8b021e1030049784163fa42bbe19e558703295bc05c92290effcbfd42. 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/DEQ021904708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d10e90bf56f0c1179df8f5be803bdef20e71b30b5d6624702350df73428aa31. 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/DEQ021904709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c802d5b42666a793a5f1f2992627018bf0578621f49ae81bc005343f72edf25. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEQ021904711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788aec6f7ad40d2150d09833629b3ca93414d032661922ee43d628827f5eab8a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEQ021904712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9084a7a0d8ce5ed8d46187a0ea43aba02a01c27322c46ff38fb7cdca5ff27dd. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEQ021904713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f3d78ed0494fd31a56780b4322fe56e94de5cb050b77d1f1a03fb2c2f3b81d. 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/DEQ021904714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca862af8885371b885cee039eb782c837f8356441b1b86f8791db7aab04d4289. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEQ021904715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046d2ccd8a12f64927628b916e5311f81cc3c06cd035e1d715c83ecda61093ce. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEQ021904717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe849f8161183a50797c229c81784d93f1afc2b6af89056a920bb5d2b18658468. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DEQ021904721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ce966c07a39ebc3443dd4a87fa367331398a4d2baa1e431a88eb70faf4494d. 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/DEQ021904723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520d40c22a72f05162cadc34674f94a945154a7f90c2b077ef31e8f42a9ec02f. 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/DEQ021904724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5da1761714207d8054d268abed3e65a3e9e7a584682379fa10f30f1b52f305. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEQ021904725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe0070838f0777d282643fc8792e4707d6bf9a28cd1e3616b8598d47c53216b. Chain 2 (Bitcoin): anchored in block 958681 (2026-07-19T06:14:54Z), 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/QZVEM1873891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cea1e24ad166e9fb8f60d5c154c790879d7cf1df888a8d30a73533c364a4e33. 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/QZVEM1873895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7658e3478e45598ab8462f0a7be7d56d7d029af3f1c14db023c5e611929e74. 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/QZVEM1873892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1109fb613736c0662c17d30314bb912a3a76f10a3d58aa9588847fae18585302. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/QZVEM1873893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4faf5bebea10c3218281c853a2d19fb2c1e545638d15cdeaa918796f735a7f8. 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/QZVEM1873894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7cba4c47fba019aeaeeec9f40d1653c871797666e0ca1f9dd7c56662b1482b. 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/QZVEM1873898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4860ba0d0539b35b32bb202cb29cf1c7eb205b6e676c73e73c1681f13b1dd2. 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/QZVEM1873897.