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 0x86a6994103cf27ff590493886cec74d4f4263b88eb5cdeef4b21f0b81aead79d. 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/626116b5-b37c-446f-a390-9f50e82a9f18.json and https://artists.proofprofile.net/proofs/artist/626116b5-b37c-446f-a390-9f50e82a9f18.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 0xb6707d0bdab248c95e0a360f2e150b56011e9a9fba7b9179bdadacd6a9e30e34. 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/QZTLA2499447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28545cbab0727a76d3dac1f1a0a59891505b9ba22cc822e0a6d3367c1241e6e. 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/QZQAY2300882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30129dab90222bcf5d86f93a053f253aa5f8544a6d4ea5a2be062d394b36bb6. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZQAY2433371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe95c57f661dcab572700a22723684b308de632e036693e617520489cd6d3d6. 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/QZQAY2414948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149bb481887c753caa9e73b070d41a5e0fb4f809c523a94af4e3d09a8ccc633b. 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/QZQAY2420913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d9b178804dab673011aafb756b8d3cb5bc9b674c0b3ad586a75d8b1ce85159. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZSYP2349275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdcd68be53efdc8dcd54196fc99e5579154a27313f64008209e2c4c0a034e3b. 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/QZNMV2309543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a631798aa459267befd0610208401e4cc1015f640028ab5ce047faf44ddd296. 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/QZMEV2378376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05811dcaf2961c952fcd68e35849dd96076850a204ed1d45dcba28d3dc88fd9. 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/QZMEV2378378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc67376e5cb103e6ffc81872b1abd3b96c26ab42f53f83dbdda2b7013b9fea37. 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/QZS7J2239348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3847cd598e19d044f1a72d63b1b48e371b9c631c2051299aa82a522f7c9c9dc0. 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/QZQAY2202531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cf9d7f5809ed9bb1c2790c73d459286dc614e21bda3432b98abcb4a28cd987. 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/QZTL92191874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba3c8e7a41b5104fa3ece6f2d07096a31f442fd87f71683c661b229913bc3c3. 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/QZS7J2145341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566467c763f34c6e4a24f60474ae186f70d1c82886d9e249b5f7c833ade2a9e4. 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/QZQAY2186477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25d9dfd6ab956067a26c2c4e464c8c5358f24226f83f5ca35bece8458571c50. 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/QZQAY2152794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53564ac6d7acb301fc401497f847cca0afd2ddab66f3cc4026d7a55e6389a9ee. 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/QZK6N2312536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45269e4f93dfbd9b01e7d4a5f3f7cf0f1df68583c83294088388f5c450036ce6. 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/USLD91754717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a5355d0ea1a4471d1f12e3e1c75dd3ca2ca660471239e4878e86be8a8eb738. 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/USLD91755423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ea7fe8ba3017b0c31d00d5a43e67f1b14176c75c3330dc8b1e4eec3e11b2b4. 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/USLD91755424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf591024a5370cb9efa778d7108caba9e2e7b2ad7aa99dec44b1c1c8e1e107147. 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/USLD91754522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2aecfccddbb685fc4fe3e44995a7a5f704a461a818b99cf365e8cca168d64fe. 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/USLD91753789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dcd8bb230427b1d8e84c50b9c807d9ce570e61c22a270f5ead076d48022bfbf. 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/USLD91755426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1a17496a758c78a2f27939e399b2ede2561df2909ff5030e11ea6e52407359. 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/USLD91752990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd36abd332d15c93fa49ead34c1f7e1129fd868b7f9b8363013fe89c0478430a. 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/USLD91755427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9e92e90cc73db908d0804845b9f83d0d819005418500cb45e4ca3b8bc0acfa. 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/USLD91755429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774c102dd1f060081865c9e7725790bf601edf1cf3727603991d108054a6cff2. 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/USLD91750825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe8d02307bc702bc34ed54f7e6500b3ff15619923c0fe315562ea3a2252a9af. 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/QZHN62175029.