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 0x41841013c36d21ae059d3f00259ebc3d4d6b044112e7502c2a8e4b4814383762. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65c0f238-4a3c-4fc3-a2fd-c347311732fd.json and https://artists.proofprofile.net/proofs/artist/65c0f238-4a3c-4fc3-a2fd-c347311732fd.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 0x4ae1614e4ea7182b659917dd8280f73d13dc7e6d57bae1a99648fb70def5755d. 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/GBRKQ2293226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924178a8abfc630eab2cf3fc4d6bde6155094ba89f07b5eca1707ae1a21604df. 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/GBRKQ2293245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5386ee7d0050de109bd0f8a7d76ea3f2e9c3948b2abd082163d8db9cb0efcf0. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBRKQ2293246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca29cef60ceeacdfffebb035e78c51fdef02c4f5fa68ed903e3a889ecf8a0e18. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBRKQ2293247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd494f527d193b794dcca7dffd145ea7df54a9983bd81f42ab5fbf6514497a55. 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/GBRKQ2293289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6603f2fb8e9f41dc8d5b2d07214c770d2d23c64a89f4b50d3e58ebf66fab9718. 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/GBRKQ2293272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd63a069945ce759a953be92f8b88383b30e526d6dc768b9750149a7d36614a. 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/GBRKQ2293258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001d146f74251b7a081444b961d44c32b8efe5259daab1755d4cf644cf3cdd7b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBRKQ2293255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2db7675eac1b9c4ac87cdc549f70a337dc753715a73cf9d4d6592578c5bbf65. 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/GBRKQ2293253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a3731410ccbc6821f90b1c6ffd32e1ee8fa54611af4a9f4e1b33dc44cab950. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBRKQ2293251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffb1352f8f8f6b0a7e304b7ff2bd09dbbf09178b2a124db1a1913841624a4c5. 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/QZ5FN2377689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a983d8727d2247de28ddf9fd9df024658ef0e8be4ed3171b86f6fb0d1e13da. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZ5FN2377704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078d56dd5d6a92a99f9c6d64a00e0fda452f385983bcff4b09ee1bf77f6753dc. 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/QZ5FN2377713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50db9c90ce21c9e9d1b6092c0fbbb1c3c9090b1407ebc9c5cadbd7417b41097c. 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/QZ5FN2377725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9e28a3133703ca0e18c483ac10d630f9b8210d4131c4c700fdc4044b508232. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZ5FN2377763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e00ab395e23696a939198af6b860ac1d51ed4090b3ab2d6befd39891fa04664. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZ5FN2377777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a914a393b826c3a30944134a39a9b08ba24fe2305640bd4180f6b3ecaad04d7. 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/QZ5FN2377792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d0afc87a83db4d8779e510dae3b4600305b4d6a745d2d5f400e4b6a6df9fdd. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZ5FN2377801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a95bd0d8b36fc43e488572d30deeeae903864acc140b66634fd561783e84759. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ5FN2377815.