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 0xd15e7cbd2a02bca24f939e797a37bba7adea1419981babcd574dcd7eb6111c83. 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/03dbd7d2-8e4c-41a2-b25c-60426287f46e.json and https://artists.proofprofile.net/proofs/artist/03dbd7d2-8e4c-41a2-b25c-60426287f46e.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 0xb3247ced811e242c4a6dfe7052996da33f1bff0555270cf9d12f743a899be483. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZNWU2006056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772da4b8951060db277b960050a5aef8e8eb58efd3d176a82cf3960877d93d04. 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/QZNWZ2025705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd61735dc3dc31be8b69af3fadb186844b3bf994917324e11d259db109452926. 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/QZK6F2056160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3b9a6fad0fecfbd241dd202cbfc38bc2da4b3459f5a0698f5ecda7f181f057. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZDA82042928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83245e0f7ad29e75779ddf2148da0b120447ddd177e10daa69364b28ce147925. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/QZES62081530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db73c4b1b9841ce6bcf083aa85bd9aa772051f1bf5c44ab364e1c5fd897d218. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZES72094455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ec1929a726dfc137510faa6b80002436e26478b563b21aa4ed228669e3c412. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZK6K2017541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8443c738797e0ad7965b14c4a95012c1ca9f81bdbfc1c75ad48b1b1dfd7eb42. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZNWV2078165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a6c6868d827c00c480182312cd5170b05c2c0a30f5d840acdc16094de29ffd. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZNWY2016714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7294d28f15c6eb37c1eb85639403987e91c53ee6d1585eb3d33e04bc6324e930. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZFYW2103285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bbdf893bcba4453f5a9041f640d3226ac0a2b60d8e04fa66c99ebdead0b6daa. 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/QZFYW2103762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e0bae1778a68124cc672cd542345457eb92ad6dd88e6dce2df54f2b54b46e3. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZFYX2161986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c8ef03a160cbf5a171500c019cc1efc4ade6624fba24302b06fc9e0723c227. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZPLS2111260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1528c200d9a0de6fa9a5ade2c41516fc221ea458726b1d4f8ba7e6bc2906c5a0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZFZ42278202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac819248ccd0a58af63218e16b6e17c1e5430b97f0926a200d17bb62d9e2ff6. 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/QZNWW2235586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cad87efa07f5eb119018584d88d436262ae9d11c3450f9d2bf6560bf2fbaba. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZHNC2301315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf8284c764c2f73e578ddad90e8ec88566d7ac463b4b37b22fa0a291b18e1a5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN42421357.