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 0x5e7703b1846c559d901b32b529149cef95b4548f545759919022dc69eead2edf. 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/e56173f2-4469-4da3-9b15-0ca9469136d0.json and https://artists.proofprofile.net/proofs/artist/e56173f2-4469-4da3-9b15-0ca9469136d0.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 0xe4ebb2149465a9d1e2f05399b9c62bb291f140d2d14d5bbf5b4028ae8c23b2a1. 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/DGA0M2342454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8134247fc62d3b03ae43c4dd53119833c60b5698780b20ae8543944c6ad500. 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/DGA072302321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749c798cb7f9db6f8fc0af61d6bd6e77808f8f90ebc44ffb0752bdc7f8ae739f. 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/DGA072302322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d67330450892ca23492a7e390f5c8b94e7beb941b64356bc14e68a39d84580. 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/DGA072302323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f645cc657c69b8b3815e41d6b3c0b64749f68c30944e2927e4dc116a27beac. 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/DGA072302324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7b94a186e282a76764fab92627d4c2e5e054fdb3dfdc100b1c1f968a74eeec. 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/FRX282329530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b70318d4b92907adb4fff77e6f3a2a09d9f64734a49327d42d2f27a35ed5be. 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/DGA092213047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef027e7d3db54d45fd4122a5c721c65b48f6c4ad4dc59c2975fe992682f5a6cf. 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/DGA052297302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6029c2d70c06453804fd8fb45926b2f95a69fbb8f2a15c6d1c405e59c500764. 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/FRX452284639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf949bee9bff1b579d51a483c8413d30c1c945fd95216ec51fb0d0bc31fdc87b7. 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/FRX202230453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3490dbe6607010efe7d9814f2c422a1ee9581084815bc6992ca0ad6341fbe3. 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/FR96X2251503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a98554a3df9e38d1288f72d3efb526f74d1138878386ba345ba58c2a618f991. 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/FR59R2249435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a65ab8c79e0a830c92daff8794a74bc7ce764e455451c19d18592042152b15. 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/FR59R2213737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35984c790030fed5ead78e85b33777ce553f19642e2fae7015490f77fac40ca7. 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/FR10S2247500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa240f8da61a87d9ecb171922273468559818fe82fef944d79719735c442e5ced. 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/FRS182104200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4e6e48a38c38c665482e589a5e5c47291e2d12dc075a87f05102c943472a84. 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/FRX872139966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5faac8c4ecaf760bea1a1766107988cbb88d3ec7679ef81f6c35cfb7218a1a. 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/FRX452172075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81694917b5f0ecb1aaf0c49ad728b2489f25751ca976ede207a7f0cd1759d5c. 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/FR96X2195073.