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 0x2f74407a2f304667c62cf66392b7b558978b123af1522faf3e5339117d825ada. 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/72210fb2-4c4e-489a-a997-063c45145ef0.json and https://artists.proofprofile.net/proofs/artist/72210fb2-4c4e-489a-a997-063c45145ef0.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 0xd646ff2b22dff981a3ea535f14352c3db10bc449dabe604aab36417f969e75b6. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QMFMF2225105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50130ea99b0acbaa661b969a6b210af79b6af0de0625058202fa8e2584007b33. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QMFMF2225106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec752751fc29a7b92f77bc45006655879f9fdc84afbd1fa354ea865c549f495. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/QMDA72285259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74dbebcfbcc3c6de61df5d74fb29f28433f6aff4c2b5252ec79686d8f92ff50. 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/QMFMF2225113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf47c1051d5737494dd9b8e495a8c45ba8e92b5a6c44421688a9cc749ee235e2. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QMFMF2223572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cca02f6f441ed6faf3467b28686d482a6a0572f3d9fd64843453c0c524252ef. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QMFMF2225114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a43193a402cb7646a2309a3a6ca37a34605ba0c29294912b200e5a24a08198e. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QMFMF2225115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d46c146bda1adeb5e01729a3828eced322dd7a2b52973488de3aea46433da11. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QMFMF2225091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fb9f0406ca5bf518a743b6eda2872ef70f21b44a5112bea59cd407fe87f9b3. 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/QMFMF2225116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb774202166e694f2330805cd38eabc7781023f711dd073e3fa7082bcdb6c61ea. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMFMF2225117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf47c1051d5737494dd9b8e495a8c45ba8e92b5a6c44421688a9cc749ee235e2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QMFMF2223572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec752751fc29a7b92f77bc45006655879f9fdc84afbd1fa354ea865c549f495. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/QMDA72285259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122e93df666e1be6f88f07881f1332a19fd4798176b814fa3e8d10fd7a4a72b0. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZTPX2261781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa839d17ef668c102b166dd7acb1d3beca32981e85a3c073e63964b79dd796678. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMDA62377938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ddc0f6913acf44130a91c4d918feb4dcc932f296d9e750cfc266c3a3daf5e57. 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/DEZC62295659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf656abacf3780b72e7e697b073bbdd38471b575850dc40ed091a1dd74c3018. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/PLL092200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acc71ba643ab2b8f97d63f0b2d0a72bca56c7389c5bb69fca789078aa147504. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZK6Q2170275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb362d5a8aa3bf5279f884bede58911a64f4828064262668cc7e6f725d37f4e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZK6Q2170276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82a2e252b9f09708ac6f1d4583d63c62f768e03cd3e985ec9af280e6b7a4953. 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/QZFZ22328296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd510d13fce7a75ee95ea1eda9187a2a4f53b82aa8c2ff08b7ffd0f25aa2a7f. 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/QMFMF2145400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302c95d4956401f2aad14e0105856962e27e747646ab30a9e4f7410418c3fabc. 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/QMFME2190061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db9a3e99236a333d095ae8df66e337b66c6f74be7803b17721f8e1dff9cc5db. 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/QMFME2190060.