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 0x0647a71831cab20ab81c403208025138e6d5cd5433a2a9213c15df787f937674. 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/0baa7b6c-a317-4ddf-bf7a-dc15dfe821a3.json and https://artists.proofprofile.net/proofs/artist/0baa7b6c-a317-4ddf-bf7a-dc15dfe821a3.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 0x160183cbe8296d9701dbcded264729ab91c05938dd9a7d843e065d2d8962c516. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZDA82231522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc12b93c035d5708da0093fa833aee172a720a607b3c7445a4e848f9cd4abff. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZTAU2219479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a4e33edd16e942747593657fae4bb7d5fcfbbe391899e7643cff4b52235bf7. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA72316952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e95ec8014ea59350c28dde4841650e450f343453a1cdcfabaf9612da3720fec. 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/QZDA82435439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc12b93c035d5708da0093fa833aee172a720a607b3c7445a4e848f9cd4abff. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZTAU2219479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4c463756419b7da92c88ca67de2def00e7a7fd6cc2f54bd984c9a8ddecc664. 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/QZK6K2415002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed44fa51fb8b6e8d5248c3d11bfa8195d235fc38b6b84d74d15b4961cf75a7c. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZK6K2415004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4e0edd35678a01f73dc4452823f0b920cf48f288ad869a4adb878937d0540a. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZFZ62593778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa004e1b7d55935d2c7375a6023ad17f1d46fc29cc29b9e1302037134cfd127. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZFZ62593779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1c1f0f0a6a5f908b9cb7d242745f7dbb52ec26e7d74fc494f974801ba039a2. 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/QZFZ62593781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea417b224c81f2ddce49a8c1b5d030fd864fd85a02d7c82b710e993f9882e3d1. 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/QZFZ62593784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83d9509fd82e104615d2a5ce72fba7ff381c56e954e2445820e51b7e30b5dbc. 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/QZFZ62593786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5baa8159b102449520fe58833f06a45ed007b13791acedd22ac1af866990336. 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/QZHN92365571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1cad84bb8872fe8f0df25b91b321cdc6b70a7ac5fb5c7a4d5de465e4069b0c5. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZES72566245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe906d20c659d86687ba32e66c51dbfe5c258591572b140bb2795ae80136617. 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/QZWFP2516765.