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 0x94f8050f7c2f373e644346b23ef7906551ccdcf6626aa705ce98d406758007d7. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea9b3867-c9b7-4b39-a7a3-c377b601ef42.json and https://artists.proofprofile.net/proofs/artist/ea9b3867-c9b7-4b39-a7a3-c377b601ef42.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 0xcb31a89a79667907cb07824baeb077bde690a0fb92c132cf854f7edd4d2cddaa. 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/QZES72413876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9449551dcb3066955e9bf1bb766412a7a80719f117f6a56841c065d943d8ae53. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZES72413874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0a46e095420bf41da838ca27700685e5ae940cee7af0b6036aaf8b87949601. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZES72413875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb37ee4b3eff00166aaee0f048915aeb22b00c03e3e61cfe2926f6e11b69064. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZES72413873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c28346488bf07c53070d6c960f2680fbc93e8fd6ff77d9b3d53465a2dabedbb. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZRP42303653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac01b2f8d17fdd35dcbfddc39cf1f09e291daadd5e4caef65610b4071dcf683. 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/QZHN32422029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbf6a19d9013e80a3f0c5c0091145acb6620a6ca3e0c1785bd7a1b03e83e211. 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/QZHN32422030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4f05fd6480549aac91a5d58cd2403a382fcf3f59dba2f113221cae18fe2550. 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/QZTAS2330709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a53a16f53649a736fcf989e2db94fd5ffc2296113e1de0cedf7d548924a851f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZHN32422031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687de4f8f0f376a86f79742d7112699c2318d08261d788f10bd73a7911311dee. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHN32422032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d7d3221468ce6006396f35f199d524f33b85daf0d10c479190e0b52c241fab. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHN32422033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c5e3510ff7c4ba2c1075ca222613447bd26ad6aec0cb6593bf347b984c0267. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZHN32422034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7008b03786a2b1e68919cfec2fa3d227b2425c8e12993605d85b07bf489fe07c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHN32422035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe5dd37b6acdbf9526bcc881af5c824f7f911d524c074c9c5641990fba42dad. 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/QZES92422206.