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 0x33fd46d5f7dade931282197ac2621186bee21492c5cc3123dd7612e53ac47d73. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7954d9ab-37b4-48f0-b4fc-0e02aa0b2112.json and https://artists.proofprofile.net/proofs/artist/7954d9ab-37b4-48f0-b4fc-0e02aa0b2112.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 0x3b13399e0da6af4207f56fc569abc2ed7571c082ac657f16e62d8204123a677b. 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/USL4R2549309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d63ce4b046e5df97555f3bb5c1a5da7d13db6951fee605924c06f9f1e86e94f. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/USL4R2549310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70624833696e3738d3aac8c2d2d46395c21cb39be936d5633fdeebf16a0795c. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/USL4R2549311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb7203fccb033e49689067b7e3bc28e36e42598342906eea4695969ccd76cda. 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/USL4R2549312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1a6286e9c3deb82eb10f0f7d59165d7bb4bbfe09ae2f5f65d5657627c1589b. 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/USL4R2549313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803e1eb0ec7844edc53cbc11aa0902f723cddf66adccaf6cb97e6927f508ed8d. 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/USL4R2549314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1bddd6cd300eeee6c902e942ae3006ed3a2a9041f363e7d9efb3c9c5fc46f6. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USL4R2549315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bd5a531f44846fefade12a426ce13bd01368613f528cec4d3acd501df56552. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/USL4R2549316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c90dea45d16879a0c102cb8fd513038f81158127bcf69b789b2b50fc03b5e6. 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/USL4R2549317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccce7f5fb02161a76d5123e10dfd6c8b710f44c46e53ecc887983afc1381e30. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/USL4R2549318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5afddc517bfaa78c870d835f7be46f8fa0521f6764e22726b545e1a72dfe49. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USL4R2549319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76375c0384666c546579a3242789ca4272724ba062d3648c258dd1c87241e3b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USL4R2549320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98c61ccfe75708436cc9feeaa08f05af31b1ffae73a5f41f60ead84605ac73a. 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/USL4R2549321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09512e258751581b819a40fcbe4233949777714754c8f53b59ac94048be7f88. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USL4R2549322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5b749b855ca49596e7ca063390719142c4ea1a2fb1708e0a72027827c81415. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USL4R2549323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351708540f0f5caf4a7c81be943751b9eb8595b3c3ad9c89358dfcf6a42d925e. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USL4R2549324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865f62c98261e8d8edf79c307a1bdd13059c450ea83548abc7e474488b9f06ef. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/USL4R2549325.