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 0xa6deb96b5cb0465651a00cf989e9ebb65bc24812fbc58d7e04cf95f8e5471d10. 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/ac112f50-7c5b-4670-a28b-54475d2ce88c.json and https://artists.proofprofile.net/proofs/artist/ac112f50-7c5b-4670-a28b-54475d2ce88c.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 0x8726d3ae1a0071403870a7816f402ba4faf5fbe22c0b349bae1d1db9efae2906. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFK2318798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39208cfe5b08876014b83c3533b23db96b13a95f8a6e90e8460b8c5a1aa43e70. 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/QZWFL2346117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67e668c166d8472fe20792c990775d694e395302663e9514341da5c9a96f75d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZWFL2346122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72a69c443b76d40bf7a9727de11f2542fc3c72b1913d2bed82091a28aad1bf7. 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/QZWFL2346123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe918ae8759f4578e5ce83b5001730daf3ee8337df6f9e84b53f2ce8b3c3853d0. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZWFL2386208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea1551d49a6d9a33ae0fbe4f3761607d284fe343502e25bfa10ef20231d62fe. 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/QZWFL2386210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98c6da999f348590a7a06eb2727eb26b0f59b73f30990c2b617e780812e0ea0. 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/QZWFM2337184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff097497c554a88278cfc41435ffe7c469f04967f2daffdb0e604c7f80150435. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZWFM2337194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0443a067a3ecc623a9d1f930ff75df5f9e11d9bc8d60675216f481d4e2de866. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZK6L2496538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e16fb92b1cdb2ec4e7bb854852720c3286d470a56b3e6992d206538129a6f68. Chain 2 (Bitcoin): anchored in block 958556 (2026-07-18T13:21:06Z), 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/QZK6L2496539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d3a13a515f0c60e4054dc19cb107da6ec05834eea57340ad75e59b092e92a7. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZK6G2482793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674cdcba43acafdc22c49c9d30d1072b4e976cdd7f9beab856462d995d9e98b0. 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/QZNWQ2458585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5054600db6fcef6bde9d4add5a2e7e2046220a7941cede7f6d53ef992b3860. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZNWQ2458586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2eecb32e506d83af3c10adeab973f3a1de9786ecaeed975121f0a325f75f564. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZNWQ2458587.