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 0x07d8b75005a5c80c20fab7175ee696fea47350c32fb2ad56a7be96572631190f. 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/83a9dfdc-ad9a-4696-8a5d-da43b625256b.json and https://artists.proofprofile.net/proofs/artist/83a9dfdc-ad9a-4696-8a5d-da43b625256b.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 0xde245e8413c8677ab76751c511f645b53a216fac9835735316d90310f6b21586. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBMA22095445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b90a269582e4fca92b5e7e840e3967e6ed4ffeb2ab68f16aba778c5f3bfe1f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBMA22095444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4689dc7c4e1a2b5f9c8f20e097edac908550b9d3af673e4041200934c04ed5f0. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/GBMA22095451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4689dc7c4e1a2b5f9c8f20e097edac908550b9d3af673e4041200934c04ed5f0. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:00:43Z), 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/GBMA22095451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee7250b95b6578f979ed469d25d56a5e300b0987ddbd3912f0aaf16da67dcba. 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/GBMA22095448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee7250b95b6578f979ed469d25d56a5e300b0987ddbd3912f0aaf16da67dcba. 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/GBMA22095448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b759a9df4a81d1bcbbbe7e969de94f23e93814969df5daa9331a60d494beec. 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/GBMA22095440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210e75371d4b16fb78133cac8e94ceee6aca973ab9ce4cd69116050f89b1563b. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T06:56:11Z), 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/GBMA22095437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20052a5ad4ba76f1df7dcb56de863396125093114e77860fc0d134cfa6613047. 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/QM4TX1616829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d96353e6358f1ae84f68e7899a3f8b57863f9aa19bd64d00fad55cf5b60f4d. 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/QM4TX1616830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454c80e22e7d438958d6dfd39395a56596653c5e08ae4e468fb6b8ed71078565. 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/QM4TX1616836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e7310f47d0801f089402d394cb00f5311ba8bb1c4e464f7f4bcec9bed23320. 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/QM4TX1616837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cf185b97481c855f01656c768fdc649476c7b33f0a83cd8152f516dfe58678. 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/QM4TX1617545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ac4cce60971fcb24a7183e1947154189f84f08a3f378dd2f3c0ae5332c8cb3. 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/QM6MZ2226730.