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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 0x438542df8c1da20ff081a943dcc5aa68d515e92b073d32b66dc72b91ea00fa5e. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/135e2eb2-bd36-4b9a-b4c5-8ada623ecf8f.json and https://artists.proofprofile.net/proofs/artist/135e2eb2-bd36-4b9a-b4c5-8ada623ecf8f.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 0xe4c7c95e1ac38c82b4ddd85372879e722dbfeb11ef3fb3e466ed973ce55cd1f8. 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/QZTBA2386660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08882ed792f7a534dfbadeb90e41d5adfb0a7a9d3f524a5205fb8e1c397a4d6. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZTB82374064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ea4613b7bc5bcf56e1d49104560b5044be85153cabb5d45c57d304a5f24e72. 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/QZTB32312187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe334a8a2e1f02fbbd0168cfbcfa31d289027f2cadddc24edad1341d0e8f14d8. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZTAZ2316503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a9857bb9ef20fa5146f1a6b277b7053d4350cee1789a17fce19ea84a6a80f2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZMER2396293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ce433d3a9f4c02c26cc14cc03b44d56883a9b835344dc04f5774f472a6025d. 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/QZMEM2397368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbbc552ed4a4341504a767f2d8dfc32de038cd2528793efd1feb9ba71a5154d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZMEM2300371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde129c48d5e5f019ae2fd8f901cc3732e88523ccf3a833358479ed011ed34cca. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZHNA2385309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23f0fd3d3207f5806bb4cb398530a9bb1381e2f21d1eee0c0babbab39e41be0. 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/QZES92336604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f913e91b13e4dc4f5f18576d45fed76906d0c366b5d1fd38fc04d29d878d91. 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/QZNWY2251291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd9fb5d4320c6bd378c432d832847ad74a6f566dd0cb757c0c2de8b45f99533. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN92213108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0223315e038df5407f850a9f2e27c048429cd9586c0d977c9526bf8f375f59fc. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZES82214411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0546187d6afbf165330ac96658c999868b818de495565721e89be4246965320. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZES62232152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f4efc0aed591c5eab50cfef360c3f47e206ff725b2346bb6fd5c86150911b1. 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/QZFYX2226380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987af591228831fb9fd39e3d25718442f568f7bc10efea92449302f70b96d732. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTAS2166373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b159c3d414f48ae068a35f8e11e50b39515432c34390fc657c4c319a50eee87. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZK6G2114462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40aa8a2a9cb42178fb8a34c80dc5127f1fc8b6e3aef8e96f45957f39825df0a8. 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/QZK6Q2186330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c9d272e13a117b901feb85b44b6ff32ca89f8cf64f049eaa8af5713240bc20. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6Q2186191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d9f6ceb6386c1b26ee2200f393e20388526687bb4d7270d9f568d5f025baf3. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZK6Q2157572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85275473eb16a7d5fc1dc837d6e09f9dcb222192b8699ab0248a084779374bde. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZHN92126271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04fd6c96fad0a5e6e4f4ab992f81434af3c180fb1d063993112069717320647f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZHN82180141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78ae69a73229ad69e7c173e44d2ce95078411d25d07d75c803a7c8d1fbf6e67. 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/QZHNC2108210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a21d87f886c530e245c688206bd105dd2d151f9fe6a08c490c6291d9b6d037f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHNB2180459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e07c86e113a6323e19d10106c9cdb28a40e2b426998e4c156e969aec07c3223. 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/QZHNB2133150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03de191610610635dbd7db4c69d329d08a5592bac0d4d86631922d34f8c68ad4. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZHNC2122942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b4f8f6ed2d29fb636c2c41fa41ee4799521ab450b5f5fe53c443744a3a91f9. 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/QZHNB2100271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52086310535f271c95cbda39376c695cf5ff1141f1152f9ea1ef1eba4bc3536f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN92192295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb9dc4708aa3d9bf0dc6379a43d782c098c7548962383d693a2e057931e2874. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFZ32149570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f518db9a15af05402dc1f438d9ce697e063fa328e820ccfc4aec3cd07f62436. 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/QZFYW2118050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72058517a9fa386ef596829e585c4d5b11642e394c5f7691a44e4ae41ae8b8b4. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZMER2048610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828e51b2cda3c99febfbd2e2c4cadbba3e99377ed65b90070f9f508aa71e6c37. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZMER2041582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8fe32f25c7424743c5a245c005ce1cd5dc707403e34769c2c3da449aaf42c2. 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/QZK6F2091617.