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 0x081a51a21ee979e10a9ffdb5c717774ba879aa73cb20b7099f6488d12d21a0a7. 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/cd8935d9-3ecb-4f70-be03-dd7936f8cecf.json and https://artists.proofprofile.net/proofs/artist/cd8935d9-3ecb-4f70-be03-dd7936f8cecf.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 0xebb1c32ec88f77d77860d60b9d1d4c23fac574c33c25e28fc9df19580f7adb28. 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/QZHN32029829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2afe91343ae7dbae60f5c298b9286bf97ccd3cdb2996811dda64622c2b1e33. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZNWU2024083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3dfa1056353619e7962d0759d17bcad6d8fd4b35a6ad7e0746413aac86f94c. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZNWU2024084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf012edcb8e7fc3df79ee05678396bf3d9ca75b46312ffbeb48ccf639e06d689e. 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/QZNWU2024085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37bd36141ece9b4cd7cf1150c290604aa6a97df2f33a73c32edeb69b102a3eaa. 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/QZMEM2141275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4afdf6592ed078c2d639f99676a068eafff297cf50747d4d42bc539bce26e7. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZPLR2105512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308a108e94defcaa7526767a123a7fa185974372282ae7047636e5052118713e. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZPLR2191675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515bf6281682b2b249ad99ed897b9792bf56bb5c26770dfb1cfd40717ec64a70. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZPLR2191676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61edea004ff0cffec68438c4308b224aab2e759337a0b51ad93b6a0b9f07af0. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZPLR2105515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2592d8e77c6ef5f89288486d230d9e51f72278f28c227873cab28e0bf815d56e. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZPLR2191677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1681853afbd36676422c81f8a6c3084c0b96e5d8b73ff6eb7f92959720b48d4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZPLR2064242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7417e8834caba939558fbf91d54bc542016800527e9e6a8e95ae858bbc7dff83. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZK6P2183046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce707fdf94883ee4a721cfa8ae0cad8bbbf81085ceb104c604f872d7fc8e04c. 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/QZDA42289588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x757984f43a23af93a182d303228d35a75af7232d687f68554cf853d71fbf7df4. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZRP52241050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85823638b10711f069270ea34eb4725de0d849c2d1a4debed0c9eb2cc5f100e3. 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/QZTB32287354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1335daa4d8769d6ca5e102a57e5b44aab9740cdddb62447c7086eae6436be38. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZMEP2294232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a3df4630fac31a3325de80d3d014a91f5ad0c0588c0e13cda3952a7fe0974c. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZNWY2257780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423cf5f2b3a6112b75c6f22a8ea1c80ad762fc4a229882a62a7e7e4e00147f89. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFZ42356939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68910f340f41ddaffa678fac675908ca48a08eb4001733ad059b4ace0854faf4. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZK6H2392304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bfb9dda99c6850d7598b66aabb233687b151c41065c2869a34f4fa9598e919. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZNWW2345859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3034f584282710a169d9272ac4c82189241f2ac844db2417264667686f447cf9. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZWFE2314426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8c92f01da93ecdc8fb9f1b0438c890529bd77e1c3038158b65d54cc292d60c. 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/QZDA52425031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08021b6689a9fbc0bcec390071afd6bf3febb42f6b4fc7508bfede0cb2c843f8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCAIZ2463615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53054b42b89741fd89a3fe1628f88207d32602ec6ca76a9c5b72a05ac9a6c216. 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/TCAIZ2463749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11a01371cbffc7131a979e5f257a9bc2dbe863c9c69e2997801058a81c0e4e5. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZNWU2461125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce9835b682c983121b2ddbacdf4c8dc86284a5624449c61f04aed2acc8562d8. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAU2548439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf444a2d5d7e58799f06ade56e8dd5c318c1542ad902ecbb9d1d3aa6a12dfa69. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UK43Q1907191.