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 0x3e6d9effa30be13447135c5a32e3f7f0e482988b705fb30feafafc6495657d9c. 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/37c73fd4-3bc9-4ae1-80d7-c3041e0f6123.json and https://artists.proofprofile.net/proofs/artist/37c73fd4-3bc9-4ae1-80d7-c3041e0f6123.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 0xd712df04845097ad89b48ed401be96fbc521eac289e81521599c9948fa2d4125. 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/QZTPX2271373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46646d4b39f8a8a1723208919481cf7349822cb17c4355e9c2a6546620d0f59. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZW9L2221461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd712df04845097ad89b48ed401be96fbc521eac289e81521599c9948fa2d4125. 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/QZTPX2271373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31c8a215a8450a4266ae17756ddac2aeaeeb2786280186b29a8fd3ae913dd55. 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/FR96X1973474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2abe1c8a8c07ce342c921b615f780dc5a8d089a2da63caa72b40bc022aa78a3f. 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/FR96X1973475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9eb8ffd5f066778907604935a7df4888db4d0f261f3fbf224269a7c68fb952c. 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/FR96X1973476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc89deb6d3c738027b637c0fdb4e6d3bb2703b8cf7baf22ab6bb65f59ade2f4c. 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/FR96X1973477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef51312969313aa7e902be55d6d22ddc71f11c6dd53b2b09dc68266d8b66fa55. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR96X1973478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91439122724d20cac911d499154b9c8a5e2155f2b839e204ef681ea8e9cabb03. 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/FR96X1973479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa255bdad59d8a7ded3e2510bdb97b91470255593dcf99cb3a25baefb5f00f257. 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/FR96X1973480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13622a5f366ccacb9313a465d45a96ff0e0e52a0d51d0b9dc86e7b91d9bea260. 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/FR96X1973483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a973d1c0fb08708e4693baba2d5a08ba23d5372d2b9570d207e858f74fa9656. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCADH1732904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0581f3845fd37be02abbc18d9c585fd77d8c439c14ee42c2e2396991c91be4a. 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/TCADH1732905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c483f69a549cea842308dc3ced7e4b53f0b445ca20e9ddd8ad8fb92025a0651. 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/TCADH1732906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95ea337c2e9bc1044deb157d6bce7c6d4a46d87d0d364198f36a6a262e220c5. 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/TCADH1732913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021132b2b5755be9ae8e8f36657c2002e87e2bb654a4e021adffa14c4a78d8c1. 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/TCADH1732916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38dc469842a7d3499f6c777c2af562840226637edcbbefd7ceaf536011b60de. 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/TCADH1732917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeba3ac8117023223d55e7554839f711c3ae843e31ccf37b1e084a2e356c6aea. 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/TCADH1732918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a20081188a531ff39175dc38d3c2256adef4c609eefb806bd170c15e0835156. 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/TCADH1732919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46646d4b39f8a8a1723208919481cf7349822cb17c4355e9c2a6546620d0f59. 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/QZW9L2221461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd952ecfc17464960bf76d85eb135562323af316b8e0b9b95fcd0e7e939032a8. 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/QZGLM2289462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd058c6041da2f998d218bb77bfcc8fb37208fff38792fd49700e40bdfe1cf7ad. 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/AUGBT2402464.