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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9e834805a5edc52a5ef4ccc8b5f6e3bb207c952e4080d58104a54bc79a18e7. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d939bd6-c50c-442f-8da6-ff8560310efa.json and https://artists.proofprofile.net/proofs/artist/9d939bd6-c50c-442f-8da6-ff8560310efa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Music For Facebook Sound Collection (VOL. 3)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19db50a0a4576e6b5b40814a9c06fdfa3a98e74a2744cad8049a35314701c998. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZAAJ2102603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa88cc78770a0b4b44370af125225545ce53e5d4c22a2918450c5892bd0633c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZAAJ2204917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a12d1a5f6f20b5b8e4fafea2798b3327872b4f9a2698a37c22188f25b5455d8. 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/QZAAJ2203632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9222e245725bec271195ea9d5fedd33d5975e39898448e954d039a2d19f971. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZAAJ2102101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c45e247d88d32a359e5f280547ba1598528a9684586add43579235bd232576. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAAJ1902230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47c53300f1513658f6338779f23bd32fec99e1215a0f53ac3ce123ec92a25f1. 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/QZAAJ2102870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176209a870a42902b7f4ec00eccb966d504c95b9755882dc270edb49feae6ea7. 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/QZAAJ2103112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ab31ddb415dfb90d06ccb4c1a4de3483ea8a4cf961c632aa2eac60cbf732ce. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAAJ1902229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38871fdd3dbfb0e315936edc5fbfa63f0d3fe7795cb3160adf0ac4fc3741536. 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/QZAAJ2001006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe743e4815e681e962e397c0f0c0386bf32dc8c30569e234334b0a0f8f64829c7. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZNWS2367787.
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 0x10d52fd03d8b55d4e02c96f43a59407e875dc65f84aed51ca829373a076c8696. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAAJ1902467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6362f87e9d43ed0ce960451627dd42aa51b36503a52e1691028c4bda9a6e47. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZAAJ1901416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd4c60fde122a2c3048e4b45173e7c80e82757c5c33f3cacf1939a04792c775. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAAJ1901960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4051c8dda8c88b27feb940ee6fa8b8c4d37e215a51d8df50ddaf9637eb9f0fd0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAAJ1901727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f68e8c5765dd709ac5319f5678a9e26bdb1ba356ac7597f3557b98110a514f0. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZAAJ1902162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb86d1c3849780d33652ac04e9a5074346b3f893ff500ae57520def68111d261. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZAAJ1901415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcda94084dfedf2d1ce7878f5c523784482b239423d08e013a58bd66402f8d2. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZAAJ1900108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847d0f87199edc0d44cd326f855a9a17c2274a331ebcfc4bb1454202d7656cf1. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZAAJ1901017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc64f451418c3a832108e798e68ca84c2bf1da81958c19c512692fcc34ec87a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZAAJ1902632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703e6ef176446ed10215311162b9672d067d48fe905d9d968cdcc725d4b78a47. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZAAJ1902631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65965ff3ae23a8e9f73d26d0e18406b5358834b125a3677d5892854526871d86. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYX2053318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf150cd38f97a3d22262561e056076aa2393a170c894d47826ce720f761b7ad. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAAJ1900269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbea828c2d036f7c2b9975326415299248ed589d406e876d1cbe788a60979609. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFYX2052542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f004e2b00efcd0b33e223e968cea473910879575128605151b782aeb9d84d56. 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/QZAAJ1801796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcfa11fd205a4568042e80706ba3cf7a56056affb6c2c91e54c54c1cc7a6c1c8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZAAJ1801958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c459c1016d93f40c4096ef0506c7f9624fc7df14570313dee0da4d0159aaea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAAJ1802144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a3fa9d09c5f49f1f0cd11df1e11569b751a967df26080b7ead72e1d8cbf32b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZAAJ1802058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c3e87801d3885ace460174affb22a91634ceee6657f8793ddadce26b03587d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZAAJ1801807.