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 0xc508a57884b4cc1359ecc2b454bb128549bbb37d06292260d61b7f4355b506d9. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c8adaba-2cd7-4ea9-b0a3-b7115270a16b.json and https://artists.proofprofile.net/proofs/artist/3c8adaba-2cd7-4ea9-b0a3-b7115270a16b.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 0x305100882de9a6abdf4c612fe03188c6bceb0edd0bd6e9443c7dda90f4bf58f0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR9W12340116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd4e3aef4801a1a884aa911291878c48b4e33025c1fd0b9482116249e19f4db. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FR9W12340117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a8b3aef2c7483879537ca32a958117a03ff8e788c899a91eb048558af96eb0. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FR9W12340118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd909a3b3fccc95838cb39118c9f95ff183b45d690c9c1749be53cd8e078ae09. 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/FR9W12340120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87402e6b01cf0bc752e34fe1c6dca45d07953c02a171aa5d6c97e9bef8d23c1. 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/FR9W12340121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc186995bdb87a354b26673d6292b00578ab3b0833a5ad1f29a4647897bb6edff. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR9W12340122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b626d3b25194cb5d9bbd09828a045cb16802decd66c06a4fe7a9959f66cd22. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZHN72349320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa990af1c842851b0bd51ffd6d499a1fa7d497588cf7f3c93dd93714bb4dc72db. 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/QZHN72349321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028e22ce9fe3eef6b86b0da4b7efc66792bfbf780d4d9711af9e39729394b351. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/QZHN72349322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9b71053d5b99b8dbb7233e2d11f091a5974895e8a7a190f527fc93ba8cd262. 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/QZHN72349323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98688f18805cf15e1a2b881e1eae4f1000078c4aee2ca1cd1c48917068e195c1. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHN72349326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf504b3f3918a3303de6881e48b13da94be9834bf722ccdcf4214ba9300df7c8d. 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/QZHN52346297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b03d85059b844a1fab6f72aadfcf2c1e238cd7655c44e1b2f31734cabdbe810. 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/QZHN72349329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4234b26cbf6a6828887f2facafbfc31a461a0c27e98bd46991328618d9def086. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZHN72349330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af9f08a8b66385acbf244889d882104939e6b9b44e1ff1fd023d3521577903d. 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/QZHN32376653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af9f08a8b66385acbf244889d882104939e6b9b44e1ff1fd023d3521577903d. 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/QZHN32376653.