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 0x3acb65dbdebddd3d8343c496d478d50d9590b46e5a867c287d8e2086cfbbe97c. 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/e89d0858-74cb-4b08-a8a5-0b9127ec0865.json and https://artists.proofprofile.net/proofs/artist/e89d0858-74cb-4b08-a8a5-0b9127ec0865.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 0x33ba17275a31a48dfc5f12cfd9a62064541284a1386f9259db9ad18609307ffb. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/BRRGE2300324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f01f7bc21e0107da01f4727266b15c441a1aa1edddc968443611a6c04126d15. 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/BKCMX2400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61d9038f6f21253b1a473900dee6b709657dfc4730b15c285d92796dd412840. 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/BKNDN2400153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc598129ab80f32c72e23bdca46b37bdfedac1765295305f1f1a4432e37f0a6bf. 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/BCUXI2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a814591af35203cac8d965b62eb039b027de40d2a45cf7fcb560378e497d53. 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/BRWMB2000952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631b22ebf203d46119ec6e374824c6b9640801dcfe63711e978f05b499f15625. 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/BKM2L2400128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a83cddebfa1083b8edfd87e99374892652b2e44d4fb56c3aa913b9dd7544bc. 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/BKBSS2300289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd878867425af8e3baed4070c20d6397715a055320b9d3921928fa852c72e6d86. 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/QZMZ92048849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8ea4d054d2bbf7be4eb5e5f9e301c5b15a37774e7d3c7cde36a9508475852d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US7VG1955979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e1e8e4647b7a812e5a49949157186f312dda29706631b07b2f28403c462c73. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/BRWMB2301028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e1e8e4647b7a812e5a49949157186f312dda29706631b07b2f28403c462c73. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BRWMB2301028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2303847501a4caf4827bc3298acba92025c9e7e33aa896f48ec200f4d72f2c69. 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/BCK3S2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2303847501a4caf4827bc3298acba92025c9e7e33aa896f48ec200f4d72f2c69. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/BCK3S2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd21a9105fa5662a6f83ae6a04656b5604029884202997808b986ee21b931c1a. 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/QZZ8B2311484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ee7e0a29ef5017cd3907e54b3424406f9ef4d76cf5bc35653cd5fc3eec9f73. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BXUS62000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc47cbd83f7fd31cfb94ab4d65ddc4760074038f165324c64b217ca27f1665fc. 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/BRUM72302013.