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 0x2228a131bd6f0a1c1deaaf57720d24c5c389083557ba55b4b225d2ba7d96172f. 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/32e7a24a-71e5-44af-b702-3280d238ec96.json and https://artists.proofprofile.net/proofs/artist/32e7a24a-71e5-44af-b702-3280d238ec96.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 0xc22e93868c7c77fb536148d5ab5b1353b038b1024770e09a2e0eb00d8449f016. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMFME2454029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590f2bb3db94f90514d9e6d09ebb8517e7cea562474f76228c7f5c402823d150. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GXFHP2425531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f76b1e90a9d12b20155828b0ca6a494ce5a7aaccae3dc3aff79858247fb941. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/GBKQU2531073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c0fef071594a38f0fce4bd3a825322ddd3f8bec3da6c7d8874fb5a5f938ab8. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/AEA3A2555484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4b3d5622652271fa9e39df8da7b537f8f2dbd48271a55083e541127e0cadf4. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/AEA3A2554258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6b812e0a51fd221e6ccee6afa542c58a97880d40ee6cc89786aa3fc7a71c01. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AEA3A2547961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d82407443aef6fcb3099e2841ba9e6a4f1163d9ab0ae9788e515b579adef7e4. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/USUYG1739243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c93a9355949adf93e36349850c29efe0e96d6ff6da69c81e7753f9ccf3e8df. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DE1ET2383881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ee4b6d69ae8f3787dc602b9971447987a124e9104c03a17beb3b4fa6b25438. 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/FRX762596403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6b3f19962bb9e8be22f804c92d7d5313bf676817bdac815bd64e03b0277c8e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/RUAGT2567997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9b8290fd814cd3bd242a729ee0193a9a2ea030695e29e17d514331a15d06d0. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QMRSZ2501649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211c06dfd5a0cb5c98da19abc5be5390726faf45cba12f638fb0cec840f35ce8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMRSZ2501650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f494f49b9620971486412d9554e1d6704b864665caf1b5d96dee84032fdb6f. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/DGA052555130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7a27e2e5394bff3fd3015136716a226796463366786dd887fc204f5f5addf3. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/DGA052555131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87738d27410656f73b742f2d2cadd93dd57296dbe871be5ebb92326e87563a5. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/DGA052555132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53a029f00670c874c27c152a8fe1db5dd29c514d62c7b6c378f950f996d48d9. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QT5M52589767.