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 0x11e76cd18c5752f3cd9336b1d00059dfcd71fb94fa5878d5b071892ea6d9e9df. 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/22ceeaa5-9700-422c-af77-c5b1815085d2.json and https://artists.proofprofile.net/proofs/artist/22ceeaa5-9700-422c-af77-c5b1815085d2.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 0x1d3c3f04ff51bac93a20ebcfbbbbd675150c019b203981462858c1fffb879a8a. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:39:37Z), 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/QZMEP2109824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9287ff7e20b03d2036a67661463b569ff177a83a1258c6e4035b32a25a69324. 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/QZNWR2182244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c90ab165efc32fa147a3e999a764580c51d4f1a3d3852595473118a58331d1. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:30:44Z), 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/QZNWS2186425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d67a65d047e1dbfb45fa78a163786c15c8103b2c661a64d0b5e1cd84154a4de. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZNWV2120796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb230f710d5e3b898efeedf0b1cf9466f0f69613e2f432e8ee29872075b26514. 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/QZFZ32255072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e2cf7e0a4490039dbea7cf0120b51f5b45a1d3255b2fcd998cdd0f6469ffc4. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZES82492541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607df0415bac971045bed5e94fd7d26dc81577da6d6bbcc9ce6f03b62d487cc8. 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/QZMER2489816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38a6c126e371519c2b98b6391e16189191382f24da3778598a506706ce80db5. 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/QZES82554706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bb214ce5b466cbb2475cfdaf188a416afdb3e298f165e8bbe939772a5ba72f. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZES82556190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91471bb39d8473e65ba57168ea6d0e783e5715a665d7e238affee41e2c240c58. 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/QZES82556213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ff3eb93bc773e34ed023c0ef30ba38ce75ce4865a2827b05b4171a7fc3e747. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZES92509022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f070b0edabc3b178ae34b0a3fdf93b52f94724c047387c8e17910ef7087177. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:46:43Z), 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/QZES92509026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6331afc8329c6b72228b17506ac5a6aac8a245b8b2daf3427e34ad99d65b204c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZES92509029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d67de7251db07380ab4395cc2410799c7f6411cd19e752c9db45902c02d979. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZES92509035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f95df5210cbae419768b4e3c7a9bbc388066186826dfbe0c09bad6b7e15085. 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/QZES92509039.