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 0x790f17e2fcacc5a0785cf20591ec0be6032c0f52036951fef05b9ea0c96c652d. 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/37ba1cd1-0c08-4504-9dfa-b040663e7be8.json and https://artists.proofprofile.net/proofs/artist/37ba1cd1-0c08-4504-9dfa-b040663e7be8.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 0xa3f3d6d6492c4c8adce4f597b9398d652c7cf3c36dac127e47beeb559dde535b. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GBSVH1099823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff27a41adf80e2a5521018f4df4c94751825dc0e2bce27bb99dd7549f75b4db. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GB2LD0901706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d686e84ec32fc5c97312991d7afe0658d15bae68edf4f19866e445ac50a37e4. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/GB2LD0902003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709bf917a19c533b44cd4d2e7dcfcfec35a9bc22d00e8126b8a8b69c7d61333b. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/TCACR1672875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcd9c3854051b02435bf765f67f32efa60076d5c8175d0131294518193382f0. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/GBSVH1099949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a641cfe673b94a231d1012a81e52ea0bf9a62201886e923c163af92bcecc2e2. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCACL1655985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48aa3c733f892a5fb82ef0c5690846222971b0232b34f0d8f6e8ad08d6e5ac9. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QT4K32541324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212d89e17f6febf995b8adc7486b83498727cb851a77e05f2a82edb4769f7745. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QT4K32541326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe213f9d8aee887cba3b7c2be608e3154e5a0305e85451d19337d63410cae42. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QT4K32584022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591f7e01fc892defc90598ba9bd1e4802ff3cd3d0b7afc9fbcde8803190d3353. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QT4K32584024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567df60374521a478ea99ba61b8ccb247154a10552e2511ae1bb6da08f644f94. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QT4K32584025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb6fbebd76697f7029794ee17146631fab07edcc2a448a5a4a366c93e838a5d. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QT4K32584026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447f0e0a01243f7ab15747243be589b870f133fb43f87f68b5d0d25d9d038ca1. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QT4K32584030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c0eb13d6e04e81561fd69d9cccea042ee8bf86ead04dc5442b4312802d61aa. 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/QT4K32584031.