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 0x5409533ef3a4c050ad1542e7fb3f6b90a9d83c1a2cd72c11c789705a5affde7d. 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/40bfd2ad-7000-49a3-a0c7-bc18c9e014ea.json and https://artists.proofprofile.net/proofs/artist/40bfd2ad-7000-49a3-a0c7-bc18c9e014ea.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 0xb25339211d30f22518f74c5be26c2a1cfac8c22e93ac822df0b4febc4d987cbd. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/PLC062380739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751d6f51c21f67063d5a885b7963dbdcd38a0410d20be66172b67b5ed995587c. 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/PLC062380740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edb54b8a7e557a0005a8991f69cfc0bf8bd555b555859399943793f5c793c1c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/PLC062376933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe272ce290f17482736066b913ff95b79d2d7d1bd7bd666c20ed94f37e28cdb. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/PL31T2403090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ad9e619048ff4e5cce76dad44d4fffd26d0e5733ffa395f160ae8ba5f9e16f. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/PL31T2408979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970b18e5c44fc51553cbc06d5943430720672e125e761552016225065ac9c1f5. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/PL31T2411404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8168c26f7338981888796070a19ebb09edd8f63c14b585881680640cb20f5c7. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/PL31T2412032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52bb38e84f2c39aa8a17cabe0eeb6d7ee22c2c35d86772ec6f4fc2a480516fa1. 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/PL31T2412026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe272ce290f17482736066b913ff95b79d2d7d1bd7bd666c20ed94f37e28cdb. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/PL31T2403090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc7d9475d6243ea7be31247918927e6e78f10f508cd0c973cb59ed81df74812. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/PL31T2404115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ad9e619048ff4e5cce76dad44d4fffd26d0e5733ffa395f160ae8ba5f9e16f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/PL31T2408979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37ec5a61c4c77527378d2179ed8ee724141026c971f3e26e0371c0d47617b87. 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/PL31T2412027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7fbb6ebbe4cbab20fc99f5a83624a365d2780e0e9bb27a0c5730649d801b67. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PL31T2412029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7007ad1afa094294bab10ba8a7528483ad11e037113c2db99578ac98d6aa89e3. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/PL31T2412030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe918a2eb4f362da8f1ea3cc9c64113d24042240df63d3ae2bde8cc2d1e02865. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/PL31T2405584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970b18e5c44fc51553cbc06d5943430720672e125e761552016225065ac9c1f5. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/PL31T2411404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8168c26f7338981888796070a19ebb09edd8f63c14b585881680640cb20f5c7. 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/PL31T2412032.