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 0x7dc313960d23f9adc5bbe693706f5b9618c2bf367cee093e458f53d1ef8aba5f. 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/73a59dd4-1c1d-4166-99a1-986be873cd2e.json and https://artists.proofprofile.net/proofs/artist/73a59dd4-1c1d-4166-99a1-986be873cd2e.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 0xf4d16fea9fef223072419826918716f3eb8aa1e34a13e86a13002bf76a31a34a. 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/QZS7J2402543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb7cae183575b849c10b320e65910b05769c547e566eaebe24448d0e25d275b. 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/QMFMG2353024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fd73671b577445261d6875c3dfcd59687bb8e26c50da3a55d94a0e51b174f1. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QMFMG2343006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388aa1c0b4dfd3b2b8a95855e961b596613aeb33c26e20b62dbadc34e3f66bd7. 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/QZWFK2344907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42cd9b2d029bce1570b1650569dbc3483b3e3b9f99cc29ecab2794a2bdc5759. 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/TCAGI2209671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a025648d08d1a2c3d436c4590f460a8a081e16703573d63b6bd6fbc45afb4b. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZNJY2466560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae08d8f75f461c8b513e734aac2d04e96cfe89638dee4e350f1603cb3455e1c. 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/QZWV32452220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6379961b7d61b2fcb33ef689c68d2e40dd23e0c6a518eb3d402dd4d4cea012. 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/QZW9K2358827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa041795dd57a5ae131427c6f0f913018d9bdde744edca0924398277330cf2b36. 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/TCAIG2424944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605a41df06be886c850bbe759c81d287ead60a758287274511bc137b8e1d19ce. 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/TCAIS2497398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4f8dcdf3c56ae6bb5cabc74c62d2b761ab09fd1a612e86793c9c1e29cec9a0. 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/QZNJY2395708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f9be902894a934ab831b09b0242128215b538e64bcb0850ea4ac789187fa43. 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/QZVEM1841527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3f2ab4c7e8979198e4202c524fa611c1e25a54e5aee43077668f7bfcb9f3f4. 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/QZK6L2379642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23992a1385eb6c441af89b1f57ca93594d1d2b4037bc3a05c5ec34c7a6909f0. 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/TCAIJ2412327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803ab9990c1a21dd55d84549af5682f3c1480432b678496e8759a17bfdb44114. 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/QZPEW2496640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dee515c5f9b6b158b6f28b40faa34d8814f59c973d5e716922b5e1d76bf90af. 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/QZGLM2564739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bdb7adfa97324edf69942d4bd8eb4bfec1684473ab26d3085fa342f1c393ce1. 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/QZPEW2526616.