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 0x9dea5a754bbe9b1de74929bb2d935329d1d63a443f625d18fb49dd58bb18e539. 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/8d529518-80d7-478b-8f4f-8f3a16a2494b.json and https://artists.proofprofile.net/proofs/artist/8d529518-80d7-478b-8f4f-8f3a16a2494b.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 0xfad3cd55e4300723354d8043e1412a91b4c33025b4d782ade42faea933f3773b. 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/QZK6J2366183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26dc02e64f83b8a6acd30073be32503b9d9b536ced0296d4145b182125080b48. 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/QZMEN2278744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1801d139beaedd6a8d9ab5af6d5f8c6f1574807798e0994541400a7d7f7cb0ed. 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/QZMEN2278745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6222630cec72592f001ecbe232e727cf5cd4fe3918767820b26cd25fc2c3e067. 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/QZMEN2278746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db6a5dea86e45045f64bff409f46d1412728c4542fd0c9cafd5e88002cc90fb. 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/QZES92229366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8446136f8d92833d7b055b9213998c0174ff37ce046b9f0e1da81a6a82a8a86. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/QZHN92213595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e138592394c7bc3e573f7e9ffd433437ca2f4cdd86f57e540f3078c3fdc3c5. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QZMEN2278747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b4ca56c5344b01e0ebc0fd6150f40ddf05c807d94231fab0e931beaecf87e3. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZES82148676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03fff73dd96523007ce36055440891756dc7d46f260942c4b3de40f04c6d167c. 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/QZMEN2278748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e073b0bce8be571d5435b62f2028ec3b3d577a7a5117a2e866a8b9ac375b57a. 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/QZMEN2278749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fab365010f1c032a45c87cc00d65af3f3145925cea3674196bae3bde09b3160. 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/QZMEN2278750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec36808786b3267e73366eff5cd386ed50b9e1445840e35065b9662ffc7a8ebb. 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/QZMEN2278751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aef6834ea385d838435e76af230116b10d2fbfa8e832cbc45c1ed25586e8f0b. 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/QZMEP2421043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591fc58a14fec069a466905011c22029151ff45ecb51a73accbff7757023674a. 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/QZHN92456123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63c4c8e29cd3cc80a0d3259472fa12c98346112b5414953999948dd8d60e669. 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/QZHNA2312434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a419e71581e27030a40cf8dfc2c3e6b37d37e433ef7fd94724756db28454ca. 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/QZTAT2267923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8446136f8d92833d7b055b9213998c0174ff37ce046b9f0e1da81a6a82a8a86. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZHN92213595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db6a5dea86e45045f64bff409f46d1412728c4542fd0c9cafd5e88002cc90fb. 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/QZES92229366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49859cb4ff40f3232ae6ed79f2c884203b6c0531f81c7182b3dc358f306cc2f1. 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/QZDA62292529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc320931d11ffecffdae34f99f261353a6a5c6fb148a172ada36e9ca9958c6c0f. 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/QZK6F2192943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b4ca56c5344b01e0ebc0fd6150f40ddf05c807d94231fab0e931beaecf87e3. 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/QZES82148676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bd259e8859211364882d35e6bd8ab260571d4bf18e2131e7eadbed461968a6. 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/QZDA62122869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9e2f882f356c36a293f1822df700f551a96df3e64c1644a1f44865507a752b. 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/QZMER2097743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbb21c17522338530ebb7b251b9f428f10ef84527c3f5b88fc58e09402ba6dc. 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/QZFZ52004031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e9e7e337cfca3c01f2b348ef488f0c4b6e9af64a0af306665304c362076bad. 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/QZFYY2001118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b5e1f1e533e34df948d8fb5e5f48d147f51b48efc36536cebc98cc3f7b6009. 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/QZHN31994391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349f3a44f45a43e1dc725e3569360d4a00a5556f2f76ac7c5092c972b02e11f2. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZDA71952899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58db7353513f1a540369bb439724f08c2bc004ac9553c6c42d9cf24722ee9a6a. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZAPG1885053.