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 0x8d9a1bac79d4dbf661f2446ed7dd1c9bc67d16d46bf44b08e8f733f14dfc149f. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4f066bd-9262-48db-a949-7d32eb06681d.json and https://artists.proofprofile.net/proofs/artist/d4f066bd-9262-48db-a949-7d32eb06681d.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 0x844a2d32ea6e3e83e11561e730bcf42af1b64a4adfb72416d2a6aa2487ba1542. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DETJ51600078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e13646355ba965d1dca153933e7ed6cdf6053592391a9e589e31719be0fa8f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/DETJ51600080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458dccfc78a145357fb205a13e83f5aa8b671d4331066bbd6eaab12faca6a3b4. 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/NLS6R1888363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f001fbf35c22de29f7251074048f80f6b852f017b171bc7659621672015028. 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/NLS6R1888364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086465ce390e8f9ee89155b909f3f1eff1a32288932fbda2c57c0ba78acb16fb. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/NLS6R1888365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e570280452aaf8faa1beb7394a7b6b4eea9be0c2d529dc2066eb70f1e208a9. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/NL4NL2019151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeac09238ed2a60ef84a857894adf8c637f5af16de148477d8a9f31059220df5. 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/NL4NL2019152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c30db7d650031685e94aaed7f3bddb1ac17b2786d10729699bc31c70cddc0d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/NL4NL2019153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629bec4c7760551e48988bae11242cb6813ea5cd046a358b889079dbf65393eb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NL4NL2019154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5aab740dc334e7bb36c2d1cc7c4c1419366bc329256975085447daadfbea40. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/SE66N2387929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7de8daef6c373d61af31f22e78748acd50c15192b8e535c301ffe2be836f0d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/SE66N2375158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50e845147d7b87b63da6cf814a7ecaa04159c66b2ef2b6b4580bb2ede2e7021. 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/QZK6Q2399161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153cd55b8997f412b02e80f342570d00e6a4175dd651de83d371ccd08c1fe53e. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZNWS2127898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5715fe32b86595fa3eb805cb287a865e29b8856cbb58a01b0754cbb1cb44395e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZK6P2150197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6121a1f96aae4dec5ab53fcc5ac5685feed1074fb11b77556f0fd654137039e4. 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/QZHN92049216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9043e59122fdd55bd8c7ebdf15fda4d6f5f6634b1fe5711c40af8a570b15871a. 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/QZDA52047005.