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 0xe73a2f0b75b65df47201e0fcd3b574cdd4fcbfeba725179d3ab59535323c7394. 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/7dc9d976-1881-4e58-b5f0-93f207f3eb58.json and https://artists.proofprofile.net/proofs/artist/7dc9d976-1881-4e58-b5f0-93f207f3eb58.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 0x29d7e99a8433f97c70a01938faff2eb01a9278b752689031e6a51ade860addf5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/BRTEU0400445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92df9995207702f769b20a499604f5538f67ee4941c55554206fd6df770655d. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/BRTEU0400448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05dd90b844bf4ad513180c2095a9ba9d475edbe3c6353494423b59d3cce2fb0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/BRTEU0300460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ab2d8a66901d302961eac56271ec049391fc1452cce59ebc95583ef70ec4b1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BRTEU0300484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410c5555a53cfd4b8cd812f74a78609bb9d83b1de3b6974c55ad2233a6a576b5. 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/BRTEU0300487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5351e884b477ed557ff7df494a390a57249167304917e82ca8e0a17b59e8e997. 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/BRSV80800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6dbbfbd10f11d1eb1d1791752e5ab318b97a7dc613d9555c77f9afc69541236. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/BRTEU0300443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8438b8bc82bfaf26eae5afcee48cef762e2e8240f956679a692a2f8beb7479. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/BRTEU0300444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15bb0b778c6f372f1871100c0edadd68d2c511a9026aa8d58d134f066b227f3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BRTEU0300458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf834619f37dffd66cf93d7e9ec8bfff6488e619123a7dadacc8f2b220db95212. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/BRTEU0300441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1a5521cdbfe6474f6c63a2efcd85eb06e9a6a913cf7ec4f061ddc2b157d006. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/BRTEU0300348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d285be959ee1ff7dc338598a640681e841cb67de65c664c86f0a90e9a31fce4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USHM91997152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8a8e9e61f6b85a3cd5d8702bf888eb8f71ac921415623088190506c2d519c8. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/BRSV80400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1df35a5367204d7915af956ab03edb39f4cb5b3974397db173f75af6dddb36. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/BRJAJ2200018.
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