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 0x25c4358b3a0bf9d6ad99bd5d6da83f539674b51c886e6f613b485f1b61c8a693. 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/f61e18c2-1823-4256-aaf5-9604cdddb005.json and https://artists.proofprofile.net/proofs/artist/f61e18c2-1823-4256-aaf5-9604cdddb005.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 0x333a2800a18b9d76a813cc077dbd815596decd0d09cb163fcdf411e057ef23b4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZFZ62047402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0507a767007560be856540b99f59fbb0ff9c6f7cb0325d8e9e25dac9ca7374. 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/QZFZ62047403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac74eb7ea666382e19c9da25e2727d26c615b8cdae30f0d0f75be09c4ed1d59e. 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/QZFZ62047404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb5afdf50ee32e3c7bbab2e5f7c52d885567051a77d992abacc45081635b4c5. 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/QZFZ62047406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc191a6300d87e7a1cf189617b0473fdd3f8f11c2f4eae1cd02a77bff63c01721. 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/QZFZ62047407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60901f91b15c0665c5bc2786d8be825c261c11471928c6f04ba61a092c6e9d5. 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/QZFZ62047408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd66d06ac95d044094c15dd891c06a97750cae4a4deb2f4442f80edfdcd5716a. 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/QZK6N2117807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a16da406e43a492a1af38b63fa1ec0f9227a25db89faa56d9db213ab722c4c6. 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/QZHN42277813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf661b6d415d9ee1cff830e6b81e4aac8a9a00ece2c4ea786ee94b9a965708f01. 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/QZHN42277814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe8bae1c2cc709a5b90b8a9731339fac19294425e1861e9ef32724773c5e146. 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/QZHN42277816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01a455274bf7b810b9d218425252b1c383d90ed905a3ed6ebb7748ada012d05. 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/QZHN42277817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a8ccfea0dcb61279f0a52387c4cd03bfc6b40d4ffa98a7f7b1de4fbcb7edd5. 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/QZHN42277818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627fb87e416f17f9c7e8d3cb79f5f3a9e7c03c908a3bfc2b0263512825325752. 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/QZHN42277821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c465ad4061148fb6fa84b4e3bae8a2894188c7a62e6f2675e26dc17b9a558f. 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/QZHN42277822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a516f37c982afec9e5a207681dfc466f34c89d3610f41f1ccc1e2d98b4be4d. 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/QZHN42277823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94e0978d921ebbbdd871873bdac3544bf9197bf09f341c2b10f6ba6bd1d498a. 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/QZHN42277824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea63797ff4bf63a6bac0897984a83000e405d4e6fce86faa67a653671c20bcc. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZHN42277825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78af70f601412fe38713149948e9c71acc43208caf66964ad3c000b3a0c6c09. 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/QZHN42277826.