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 0xeb6ed73c3ff5f034c07aa0b9907809e4884b92b50b22151925e41cf07cc1a81d. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/749da84c-f72a-47a0-b896-bac9cd4efbaa.json and https://artists.proofprofile.net/proofs/artist/749da84c-f72a-47a0-b896-bac9cd4efbaa.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 0xd0825ab870910c911dd41266af6d73ba8875794c3b656322f36750c92756f779. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USA561233423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c019ff8d60ca7dd656c558f93ba513897ac89df9aa5a33442ec61372c826b0. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/USA561233413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c00916ca51d863032af30612da02d1ca57348c774de53e5b0512e9962f524c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USA561233414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1734486b6d3da1025e576733483203a020e038b06dd1a436326c980ca9b3687. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USA561233416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b7288556cfde34e5d45da70c768e484d0eba34ad3ea993ecced4a73d40031a. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:25:09Z), 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/USA561233419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8bf848185c13b0ef594f2bb5ce1053cad147768701778b658d5ff31501d71ed. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US7VG1504437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2606377fe1c8e4f51ee3cf7e86b1d4c101466a3d532b00fee9ebcfbec983274. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:49:19Z), 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/MX3741700281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca3d2a9574f1ea027e512cfb14d6fe4451aca5d791c80674b22c39d256a6de7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/MX3741700284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8152a3d3304128f857c810458c587afcaa361b57a26d160baa8910e9b7554367. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/MX3741700283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed46a3cb0478ba1efe8432bd98a3c7813c9f37936923da5ffe025a06960b6cdb. 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/US7VG1510739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517e5ce1ac7ffba843448dc7b54e00282bbf1095f2dc2b8dbd9dfc20fc39c93d. 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/MX3741700287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2177999bf88b105f2eb93215ca81082390abd54c427c38cada8b027b06059f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/MXD781904479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2978287b3e23241745704652e569dfd92f0db6c7797db3cfee05750bd52066e. 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/MXD782001418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7496708aa489557de41eb8fcd9658dc0684b8ce1a99414550896f52101721e69. 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/MXD782103111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373859d4499e05e7bccff0f32f18cf6e0b557f841b8af64ea6caafb891e98d4a. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:46:38Z), 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/MXD782103970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37bf997400daa6e9e795bcb829d6dbbb078b826bd28193456431e557e5dd427a. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:01:21Z), 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/MXD782302869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0423e01fef7ed2bbe58998a79cb10162d73967c45dc085cb4d28bad3aa7574. 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/MXF012301278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e703f8d00d7d91876b1da66bb5f4eba22e9a6add1d4dc42c19007eff7fdf900. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXF012100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d6c523e8a21c17170b60ca12826a5db3bf9a2fede1bf9150b25f0d3fb22732. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZW9N2231572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776a78e08af44beda90f019023738c353865b08473df27de553ab7a7a8f4769e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZW9N2231575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4909c3b451f7b1b3c77ff960217c62372fd7c1f8e5069d6121265f315114dec3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MX2341300084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061e959a276fcb8614a65bbd36aae0a0199b8e860b497d4651e209648e78377d. 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/QZQPC2100190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061e959a276fcb8614a65bbd36aae0a0199b8e860b497d4651e209648e78377d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZQPC2100190.