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 0x403eb749dd07f35ec32d2aa616a48c7bc475154d3fc3be48204509b6a73543af. 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/a58f314c-5913-495c-ad5f-f1bd0b7a5c9e.json and https://artists.proofprofile.net/proofs/artist/a58f314c-5913-495c-ad5f-f1bd0b7a5c9e.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 0x40dd76b8ed6012d90d9946de80dc43261643c6f113fc7e789fe529fe4bb85e68. 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/QZNJW2435791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910ed2ff8d243eec097e0cb87fe06720f476905c3d49549ceb4c7a6362adea6e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BC1U32201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7148308508eafb1a68a3131d0d6b837fb9d05d3e768df28501645a01580b877f. 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/BC1U32201121.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378dc0a859b399a3cd692f73c17fc7094bdf32c4bf15547b50f693c64d35d687. 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/BCUWS2500099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64976c0ef0ce4d91f73b036131b8f28db71e432ca405f0c534c001c79118a5a. 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/BCUWS2500098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533726ff4e5688a67ee663432faf262e563a37fb13015cdabf064d2d99d17704. 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/BCUWS2500064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25cc6cc5db532255be082846496f8a60772d54d99f5db8e2e847a1413dfd4f9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BCUWS2500061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944636bd12497a7a9759d1c8265493b2a2041b8681368b542639b5ceb0a75dce. 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/BCUWS2500073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e80b8c9e4397874245ede793bbaa993e842d451f08268c6944080913eeb7f8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/US3DF2515957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e293cadd14d1b5224deab2621476679a85d619f3f012c4d83192e58f9634ee. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BCUWS2490282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157670ff8b6ad1275b66a4633dce0d19ead8c0fcb6f20106ccf289966b5571ff. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USANG2497908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b3cbceb828bad93de5e9d23585352269bb06b8b55a5ee679f375a04c448016. 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/QZTVM2446170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcafa18f5af1b5809048c8f6187ed0813acf6daa579c2d7b8fe66387889841e. 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/BC71O2400151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd4a41445493ac4a00a6ced2b90139bef45436596c49ada5d673379ea36b038. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BC71O2400148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239ae890fc2214edaf66117ff85488e67e4c3dde24fea60974646fd99ca5ecf2. 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/BC3PG2400586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6564eed636d9a90543b61f0afaa6f7e179eb379c280ab05baf02d5d7c2abb4. 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/BRKO12204295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49ad92a4bab68162f7e49358338aca6d5daaa16dae0d768c6c84a41284feb42. 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/BC1U32201027.