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 0xb69b63d52ecaf5fb282b0e307b6dee5326c1d92f4f8b79ee8080d1cade7af555. 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/e65d3764-03ec-40ce-9c74-63fec1214d79.json and https://artists.proofprofile.net/proofs/artist/e65d3764-03ec-40ce-9c74-63fec1214d79.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 0x9617899453a7ea518ef073aca96edf76011efa465e8c5f21097f0ed4194f768d. 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/TCAGF2242125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62a5326eae4cc6b7e6d2fe7305af3b0214aab34d7e014aacbeee23afcbf904d. 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/TCAGF2242174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b8f84f2b8b646a4aa42d8baa550f29e0ae1ed9a13a43f1d631d7c6d47153e9. 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/TCAGF2242178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43b4e0ca33ef48d8d33e5feb127dfba5eb78176f329b84f9847e77d05aba11c. 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/TCAGF2242180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77e8ff16a7b63110e7d0787312e85d4e7c6f666e3228d6bc31503c15768345b. 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/TCADU1888121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf6e174a46bf836d1600edd6cbf1190e487098ec54193e9eb18989114050099. 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/TCAGF2242188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6328d810cc8ad67a31d0e3cf1fbad33f3b8fadf8f6f43d9db0729662a0bb5d. 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/TCAGF2242193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268126145d65c7f591db54802637a791be5828ee95ea16e097c8842538f3015b. 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/TCAFF2041960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e6e3673910c27724eb50a1865fa0d2cbddcde82d59080a2dd17a027c2b31d3. 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/TCAGF2242197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ee2d8e96e048280af8ad1337404fb51050d109df05d1e678713b3c8b06d175. 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/TCAIU2409150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1a7acf88b0f69fd8c194fa128b0ba32035a5c6a4755c12a517eca76304348d. 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/TCAIP2463429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed131722eebdafe525ff4f6fb4686c1cd9fc40f10ef5a850c7f4e9e87408d041. 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/TCAIL2423869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f1688c8bdfcb69368cca412b57586da2e63b31c907759fb11598d01629e6d8. 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/TCAFZ2257740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77e8ff16a7b63110e7d0787312e85d4e7c6f666e3228d6bc31503c15768345b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCADU1888121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083bc8965072d145e00e609fe6dc0a933242d4daf8bbaff6b1bd22875512c416. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:39:26Z), 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/GB8UU2400005.