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 0x8161038e77490089f5a9101c8723760a1c90747a14d1e73b0044692f308b1cdf. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fafa01ea-5a8a-4c3c-b1ce-07ef5508924b.json and https://artists.proofprofile.net/proofs/artist/fafa01ea-5a8a-4c3c-b1ce-07ef5508924b.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 0x5353339b081d1b0d6ad8710217a8728d442854949893cb7af7f372cec0295915. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USHM91632977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed72c44c5de0e0d1f3ca5628efcb37805513c4ae056da13e418f7cd462238c8. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USHM91632979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc757bc87fe69e48bfe2a17ad86628df869a988c3ac38031cef89fc570409da54. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USHM91632980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69bca1c90b7916d86538c4869a8f672609083e5dbc6a764de17a5f14d586007. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USHM91632983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb019ad80c01a4f6a9e93cc9f9370e8c2c49d8bbb097ba3d8888b30da019aadd. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/USHM91632985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8b12f117d5efde9699d9505fffc8e3f0a5b6b6509d1b85d12767cb0cc48f4e. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/USCGH2280118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5303da4f03f4def4345d33964346a8e0da4c1fa62d9c64ab1a196c47db002f79. 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/USCGH2296709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2aaff62d899645addff19adbd2cae092ec1837d88f89a2b40a39712eb05e19. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USCGH2296710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac1d5cf5e9d54480a6efc6c7c5a030179a3d6137ecac13e5ffd36d983943b7f. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USCGH2296711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da6cbe9b9d6cffb1c01bb8ecea6eec2c2260e391a6ddf232b4634dc272ae5f2. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/USCGH2296716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8ee1403dc00c2720faea91846dbc4c742e5aa3c9bdf0df5c6a65ccbf6b1914. 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/USCGH2296717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff50c3d31516bca88a6d3cf17fcb33764a6a81272f5f6e643d473326b37ebee. 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/USHM82367290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7aa4b235296649d1b91c19ff0bb92010d4b7b68acd44d5368da2afec5874cfe. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USHM82367292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d66ace854a2d3db6f3ffa2f25f1813d75c8908130f644ca54c2721afaddc578. 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/USHM82367299.