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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 0xa3845024790b29a49a868154a8da1718205ecc981f70b087ec0710b7640cda2d. 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/ff7e9cdd-bdb6-43ef-9cf1-c48236883e1f.json and https://artists.proofprofile.net/proofs/artist/ff7e9cdd-bdb6-43ef-9cf1-c48236883e1f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xbdb6c5df0f9611814dccb0033adf591427b3a49e17f2f8cd64de902cf9fc01e6. 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/QZMEP2083538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c254dd0925e078d35efc3d6a3a8b851c751072c6f0d0daf9f24c6a3c305897. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZNWW2070597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42f1c396501f46e8a15856cda4a7f4f1398a5f400ded3035cf35fc690e66030. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QZDA82296968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594f524108872d93b8c32ecb96db8c1612a7a7dec5fddc3a11031734ba291f0f. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZES72295330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17613e46a1614f679ebd1eaeff5303cadf85c9fe28b3de005d1b3d0178fa7375. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZES52227507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9228c2e39c28ef3264d4be30d7d7ceb1072053d290ac39a5a8d55af011591edc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES72295331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae2c4b303507fd9d25534ee8e1f2b4d94164cba7dc44ef88e098d3c9f6106b8. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZES72295332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1faa811bbd5baf7e52bb458a64cae8212dffdad4a2d77f3db02ca9453eae8e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZES72295333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474fa5085e0f30629a242c4841a058400e688206c7fdb99bce5b6a8e228c619e. 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/QZES72295334.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f8ba555828e4535993b3653edc7243f8953860c46f00932a910b108d605231. 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/QZK6H2210251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939fe446c26cab6c6235fcda2d7f9275638fb32862f8b412a09ccc6483b7cb47. 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/QM6MZ2167328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83379d0890e516ffdcecda11629f5f5d34a1e245c345f80cc5c21c1c88688ff. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZFZ72203021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eec033d75ab7b2d24c4c1628da952221c8dbdb3520576dd93b324e92a5498a6. 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/QM6MZ2167315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f037dfdc7a6bbf94fd782da5b095a516509acee5b1f2b673f7fa14b01fff265. 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/QM6MZ2167316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc652391dcf8e123344eb1b9e934cfdc74b8a85cc2bd50153459c585fcc7a718. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QM6MZ2167317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8233b73205d874043ff31dd592e7b2fb1d9a9e4a08599be0471ab54189e49cb6. 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/QM6MZ2167318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fd83d07618994180cf8a088c426668d018ae8a7d28757302d6318e24fdd267. 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/QM6MZ2167319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41466514c1c0f1025c2456efb194b145e4e5bc40ddc27601a6bceffa6b5fc07b. 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/QM6MZ2167320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be11b429038c28f362187f212c2eeb57e729434dba163f8eefb52c3ddfe5983. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QM6MZ2167321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df3e08212b6029b71ec4145d0ceb58b8eb48bba175bf24e6d9ec1f976d2b03c. 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/QM6MZ2167322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b2cc0227f36430b66cd417f9f6bc5131a47e4c21197dc0eca819393dad35bc. 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/QM6MZ2167323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6169860a4dea3294b1b40a5b19185776c54d62ae84c349923af086291ce717d. 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/QM6MZ2167324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f1cd0d5b51e9fd7f73e41f070464ef2ce5611f3380c8530050b9a54df70a06. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QM6MZ2167325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5d99a8eb2281b99d2f96cc2c6f9a56e3c78fd9403607b8dd7e43cd1de17d06. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QM6MZ2167326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525985aa208a02339ac73b7cc7767e78d8d9f8c61b909951ac072de8c438bd28. 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/QM6MZ2167327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939fe446c26cab6c6235fcda2d7f9275638fb32862f8b412a09ccc6483b7cb47. 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/QM6MZ2167328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e36ce30636b071ba1672668d2acbcfd27c9241e66cc8f652e02c682631edb76. 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/QM6MZ2167329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01655ebac49fa7cdd9d99347ad945ad1b224340cb480762035d62fb28d3908d7. 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/QM4TW2163829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2c5949faf78feea45b703044dda3ef5f850aac2fb12af2575ab6a6f6b691f0. 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/QM4TW2142493.